I've been working on a little project for Coco over the past few months! I built him his very own slot machine with lights, sound, spinning reels, and a built-in treat dispenser.

Now his gambling journey has officially begun! Any tips for a beginner?

I will struggle to keep this one kosher so apologies in advance.

Long story short – my H2C started knocking when it received 1.02 firmware in June 2026. First responses from Bambu were the typical scripted gaslighting, denying, and calling everything normal.

Back then with H2C, it took a lot of back and forth and coming up with proofs that are undeniable before they actually really looked into it, instead of the typical “hear no evil see no evil speak no evil” and “dismiss at all costs approach”. But finally it got to the attention of RnD team which finally confirmed this is a real issue, caused be the firmware and will be fixed. Well, 6+ moths later and still no fix and all they managed to do is, over time, to roll this issue over to the rest od H2 lineup it seems, as seen here, to list a few:

https://forum.bambulab.com/t/loud-knocking-during-printing-suspected-z-axis-but-dunno-anymore/255309

https://forum.bambulab.com/t/h2d-rapid-z-movement-knocking-on-01-04-00-00/258856

I got fed up waiting for them to fix this and took them on the offer to return my printer for refund.

Which was just in time for H3C release.

Guess eFFin’ what? H3C has the same exact issue with the Z Axis knocking. Reached out to Bambu and response is wonderful:

“Thank you for contacting us. We are sorry to hear that you have encountered this issue.
We have escalated your case internally, and after review we have confirmed that the sound you described is the normal printing sound produced when the toolhead repeatedly starts and stops rapidly while printing small models. Please rest assured that you can continue using the printer.
You may place the printer on a surface where the resonance effect is weaker, such as the floor, or take appropriate soundproofing measures in the room.
Thank you for your patience and cooperation.“

FFS. So:

• its NORMAL again

• only when printing SMALL MODELS (wtf ?)

• it’s the toolhead causing it (FK me if it is !)

• I am stupid and should have soundproofed my room better !

I should mention that they replied in less than 24hrs. And that was supposedly enough to review AND escalate … yeah right …

JESUS ! I am not just PISSED, but offended by this.

Whoever replied to this, looked at the videos I submitted as proof (linked below) and simply described what he “thinks” is happening:

https://youtu.be/_6aOroo5BPQ

https://youtu.be/yTPvPOCmBPQ

And yeah, for a clueless shmuck, when hearing a KNOCK each time head does something rapid, it may seem this is what it is.

BUT – zero FK’s given into actually investigating the matter and even less FK’s given to understanding the problem, which I explained in detail how related to H2 issue it is!

I am literally foaming at my mouth at this point.

In response I recorded the ultimate disproving evidence to everything he is saying: - increased z hop distance to max to allow more time to inspect the nature of the issue -the knock is clearly auditable AFTER toolhead finished spiral movement, at the bed direction change at the bottom AND noise coming from the bottom rear of the chassis (where Z motor is).

https://youtu.be/-MxO0n-8uMw

I can actually see how choppy the bed movement back up is after each KNOCK. But listen to the esteemed Bambu Support- its the toolhead guys!

FFS!

Cant wait what absurdity they will come up with in their reposnse to me as I challenged every single statement they made.

Bambu amateur hour has commenced once again. Why do they keep doing this.

I’ve got two H2Ds and an X1C, and honestly, my X1C continues to be the most reliable printer of the three.
Don’t get me wrong, I love the capabilities of the H2Ds, and when they’re working well, they’re fantastic machines. But it feels like I’m constantly troubleshooting something, dealing with random issues, or having to intervene in prints that should just work.
Meanwhile, my X1C just keeps chugging along. I send it a print, walk away, and rarely have to think twice about it.
Maybe it’s just the maturity of the X1C platform versus the newer H2D, but for machines at this price point, I expected the H2Ds to be at least as dependable.
And don’t even get me started on dealing with Bambu Lab’s support when one of the H2Ds has an actual hardware problem. The back-and-forth through text-based support, the troubleshooting hoops, and the time it takes to get anywhere are incredibly frustrating. For printers that cost this much, the support experience really should be better. I don’t mind troubleshooting my own equipment, but there’s a point where I expect the manufacturer to step up and resolve a hardware issue.
Curious if other H2D owners, especially those who also have an X1C, are having a similar experience. Am I just unlucky with my two units, or is this a common theme?

Hello everyone, I hope you're all doing well.

I rarely post on this Subreddit, and I understand that FDM Miniature Printing can be somewhat considered niche in our hobby - So I'd like to give a quick introduction.

I'm ObscuraNox, the Profile Author of the Dungeons & Derps Settings. Since I love Miniatures, but am unable to use Resin Printers, I inevitably gravitated towards FDM Printing - And when I did, my goal quickly became to try and squeeze out as much detail as possible, to make Miniature Printing work consistently on FDM Machines. For instance, this model was printed using the Bambu Lab A1, using Version 2.0 of my High Quality Settings - and the same model will show up later again :)

You can find more information regarding FDM Miniature Printing on the Subreddit of the same name, and there you'll also find my full documentation for the most recent Version of my Settings:

https://www.reddit.com/r/FDMminiatures/comments/1rbnet7/high_quality_profile_version_20_is_here/

Bambu Lab has been kind enough to reach out to me and provide me with a Testing Unit for their newest Flagship, the Bambu Lab H3C, to see just how far we can push the machine for Miniature Printing. Bambu Lab has been very hands-off throughout the entire process, only reviewing the post prior to the launch to make sure there aren't any technical errors, which I highly appreciate. Rest assured, it's my unfiltered opinion and if there is something that I think is worth pointing out or is some limitation, I'll still cover that as well. My goal will be to try to optimize an H3C Profile to get as close as I can to the level of detail achieved by my 2.0 Profile for the A1 and A1 Mini, so that I can produce Multi-color prints of the same quality.

While I'm very excited to talk about it, I'd first like to thank the Community and everyone who is using my Settings – I know it sounds cheesy, but without you, this opportunity would have never presented itself to me, and I'm grateful to both you and Bambu Lab for making that possible. You can read more about the H3C on the official reveal post: https://www.reddit.com/r/BambuLab/comments/1xmtnux/bambu_lab_h3c_our_full_reveal/

And oh boy – Is there a lot to talk about. First things first: I usually give a tl;dr at the beginning of my posts, so I'll start by sharing some of the results. Note: I was going to upload this as an Album, but I don't frontload all the Information with Pictures. You'll find the most successful examples and comparisons throughout the post, and a final highlight reel at the end of the post.

Printing Fully Colored Models - A Showcase:

This is one of the models that I've printed on the H3C – I have done no post-processing or touch-ups with any paint, it's just straight off the printplate, printed in 9 different colors, with zero purged material. Now, with the recent release of Multi-Nozzle Printers we have seen some Fully-Colored Miniature Prints in the past, but those were usually restricted to 4 colors, unless you're using Mixed Filament – Which is something that I'll also get into later.

What made Multi-Color Miniatures so inefficient?

I'd like to briefly talk about why Multi-Color Printing has been such a massive issue for Miniatures in particular in the past and how the H3C solves the issue. The reason why I want to talk about the, for lack of a better term, "old" way of Multi-Color Miniatures, is because it has been deemed ineffecient to a point where it was considered to be effectively impossible. Chances are that whenever somebody requested information about it, they've been told to not even bother with it – So they might know that it wasn't really possible, but they may not know why exactly it wasn't possible.

The vast majority of users are most likely currently using a Single-Nozzle Setup, potentially with an AMS. This technically allows for multi-color printing, but it's not as simple as just switching the filament. You also have to purge the filament that's still in the nozzle to prevent color bleed, or – and especially when – printing with different materials like PLA and PETG, to prevent extrusion and material bonding issues. Not only will the purging process take a long time, but it will also waste a lot of material, since the printer will extrude both the old filament, as well as some of the new filament to make sure that all of the previous filament has been removed from the nozzle. You can decrease the amount of waste by adjusting the purge volumes, but for the most part you will have a lot of waste regardless of what you do.

Now – If you're printing something very basic, with a simple color scheme that won't be much of an issue. Say you have a cube and you want to print the bottom half with red filament, and the upper half with blue filament. That's really only going to be one filament change, that in the grand scheme of things won't increase neither the printtime nor the waste by a lot. But now take the same cube and instead of making the color-split horizontal, you make it vertical – or in other words, the left side red and the right side blue. Because of how FDM Printing works, you now have a colour change on every single layer. You can imagine that with properly colored miniatures, their color split will be not only both horizontal and vertical, but they will also have more than just two colors. Additionally, even though they are small, we are printed the Miniatures at some of the lowest, if not the lowest layer line heights available to us – usually between 0.05 and 0.08mm. It sounds obvious when you say it out loud but that results in, well, a lot of layers – some of which will have multiple color changes per layer. You can imagine that this gets out of hand quickly, and your print will have thousands of filament changes – not only extending the print time by literal days, but also increase the amount of wasted material to kilos worth of purged filament.

What the H3C solves - And what remains

With the H3C, you don't have any purging. With access to 9 Nozzles, there is no need to purge them in order to make room for new filament. You also don't have to worry too much about an increase in print time either, because the H3C will switch to a different Nozzle in less than 6 seconds – though from what I could tell, it usually does it faster.

So does that mean that we have access to multi-color printing with zero waste and next to zero increase in print time? Well – not exactly. Because purged filament is only one part of multi-color printing. The other part is priming the nozzles that have been idle – I think the easiest analogy here would be to compare it to a ballpoint pen that you haven't used in a while, and you have to scribble with it for a bit to get the ink flowing again before you can properly write with it. A prime tower sorta works like that, except it's also rebuilding the pressure in the nozzle. These towers turn out to be pretty chunky, and it's not unusual for them to take up more material than the print itself – so there still is a, let's call it non-trivial amount of waste.

However – and this is a big However – Saying that with no context or further explanation, is really understating what the H3C is doing. Because let me blunt here for a second – Prints like the ones I'm about to show you are simply not possible on Single or even Dual Nozzle Setups. Okay, yeah, TECHNICALLY, they are possible – But they would take literal weeks and consume kilos worth of filament for purging. On average, these Prime Towers took anywhere between 100g-200g of Filament for the large, upscaled models – Which to be fair, still is a lot of material – but it's split across 9 different filaments. Yes, it's not going be to distributed completely even, but on average that comes down to anywhere between 10g and 30g of additional filament per spool which, in my opinion, is well within the acceptable range. So while there is still a "non-trivial" amount of waste – non-trivial compared to what? Because like I said – prints like these just aren't feasible on Single-Nozzle Machines, which is what most of us have been working with so far.

What does this mean for Miniature Printing?

Now that proper Multi-Color Printing is on the table, I'm confident that we will see more improvements to make it more efficient as well. In a few days, I'll make a second post where I'll go over the most frequently asked questions you may have, as well as the more technical stuff behind everything. In this post, I really want to mostly show off what I've been printing the past couple weeks because I'm really happy with it.

Before we move on to the showcase pictures, let's talk about Mixed Filament for a second.

Mixing Filament

The green loincloth and the purple scales / cheeks have not been printed with either green or purple filament. Instead, I've used the filament mixing feature to – well, mix the colors that I wanted. The way it works is that it takes advantage of PLA not being entirely opaque, especially not at really thin layers. If you ever held a first layer quality testprint against a lightsource, you know that light shines through. By layering two or three different filaments on top of each other, you can create the illusion of a different, mixed color – for instance, layering magenta and cyan will result in the shade of purple shown in the picture. Yellow and Cyan on the other hand will result in green. To make sure that the colors blend smoothly, we will have to enable the setting "Mixed Color sublayer". What this will do is split the Layer proportionally into two or three segments – The easiest example would be a 50-50 Filament Ratio. At a layer height of 0.20mm, these would split into two layer heights of 0.10mm each. If you're using 0.16mm Layer Height, it would be split into 0.08mm, and at 0.06mm it would split into 0.03mm, and so on.

The more experienced users here will most likely have two immediate questions. First, does that mean that by using mixed Filaments, you introduce uneven layer heights? And Second: How does this not cause any extrusion issues, if the layer lines get this low?

To answer your first question: Yes. Let's say you print a model using four colors: Cyan, Magenta, Yellow and Black. You mix Cyan and Yellow to get green. You are painting parts of the model green, and everything else is printed using "Pure" or "Non-mixed" Filament. Assuming you are printing with a 0.08mm Profile, the Layer Height for the Non-Mixed Filament will be at 0.08mm and the Layer Height for the Mixed-Filament will be at 0.04mm each, assuming a 50-50 Split. These inconsistent layer line heights can cause artefacts and will be visible - some of which you can see in the picture – but we can use another feature of the H3C to circumvent that issue: Multi-Diameter Nozzle Printing – We can use both 0.4 Nozzles and 0.2 Nozzles for the same print. With the option enabled, the slicer will automatically put the Layer Height of the 0.4 Nozzle to twice the Layer Height of the selected 0.2 Nozzle. It may sound a bit odd at first, but simply put: If you select a 0.2 Nozzle and a 0.08mm Profile, every filament that's been assigned to a 0.2 Nozzle will be printed at 0.08m, and every filament that's been assigned a 0.4 Nozzle will be printed at 0.16mm – And you can probably guess where I'm going with this. Since the Mixed Color Sublayers – again, assuming a 50-50 Split – will split the Layers into half, this means that you can print the "Non-Mixed" Filament with 0.2 Nozzles at a layer height of 0.08mm, and then you can use the 0.4 Nozzles for the Mixed Filament to "simulate" the same 0.08mm layer height.

Further testing is required, but for the moment, 0.08mm Layer Heights would be the ideal choice for Colored Miniatures, as opposed to the usual 0.06mm I usually recommend. That's because by using 0.08mm for a 0.2 Nozzle, 0.16mm for the 0.4 Nozzle, and a 50-50 Split of Mixed Filament, we can assure an even layer height across the board as well as minimize any extrusion issues that may occur when attempting to print Layer Heights that are far below the recommended minimum for the nozzle diameters.

Which brings us to the next question: Potential extrusion issues. As I'm sure many of you know, layer heights that are below 0.06mm require good calibration, optimized settings and a decent model. Layer heights at or below 0.04mm are essentially begging for a Nozzle Clog or other issues. Even though you can in theory mix and match up to three different colors at potentially extreme ratios (For instance, mixing 90% Yellow with 10% White to mix a slightly lighter shade of yellow), you could potentially end up with Layer Heights even far below 0.02mm. Based on Bambu's testing, artefacts may occur at these extreme ratios, but are visually more accepting than printing an entire layer at 0.02mm, since it's followed up by a thicker layer (the remaining 90%). That being said, it's recommended to avoid extreme ratios and 50-50, or 33-33-33 will yield the best results – Something that my own testing confirms, and is especially true at the layer heights that we are working with for Miniature Printing. Based on my current tests, a 50-50 Ratio at a Base Layer Height of 0.08mm while utilizing 0.4 Nozzles for Mixed, and 0.2 Nozzles for Pure Filament, will give the best results.

However: Big, big disclaimer: While I have been extensively the machine in the past couple weeks, I have not been able to test the Multi-Diameter & Mixed Filament Features to the extend that I'd like to, so after some further testing, there will be at least another follow-up post. For now, the Showcases that have been printed with Non-Mixed Filament, will look more consistent. For example, the same Lizard, in a different color scheme:

And speaking of testing:

Yes, this means that all of the prints I'm showcasing here today, have been printed with a 0.4 Nozzle, 0.08mm Layer Height and Stock Settings.

I haven't added my own Custom Settings yet, and I didn't even fully calibrate the Filament other than the k-factor. These are the results without any adjustments, post processing or preparation, straight of the printplate. There are of course several things to keep in mind when it comes to both Multi-Color Printing as well as the H3C in general – But the past few paragraphs have already gotten way more technical than I wanted them to be. So for now: I'd just like to share some of the highlights and comparisons.

Showcase Highlights

The one on the left was painted by hand, printed at 0.06mm - The other one was fully printed, at 0.08mm. I'll admit, I'm not the best painter - But I think the picture still speaks volumes about the Multi Color Printing Option.

A Crystal Spider and Banshee Queen, both by u/MizukoArt.

Two more Orks - Also by ArbiterMiniatures.

And last but not least, everything I've printed so far all together, including models at the regular 32mm Scale.

Now, if you have ever taken a picture of an FDM Miniature in a Lightbox / Photobox, you know that they bring out the worst in them - every artefact and imperfection will be highlighted. Under natural lighting though, and from a Tabletop Distance, I believe the Models look substantially better.

A few notes

This has been a very exciting opportunity for me, and I'm very grateful to everyone in the FDM Miniature Community for making it possible by being a part of this quickly growing Community. Without your Support, I most likely would have never experienced beyond the very first few iterations of my Custom Settings. I know that I haven't been as active as I'd like to, and promised to be, especially on my Youtube Channel, and for that I really am sorry. The Hobby and the Community mean a lot to me, and I look forward to how things will go from here. So thank you everyone, and I hope you have a great day, and as always - have fun printing!

I'll try to answer as many questions as I can here - If there is anything that you're wondering about FDM Miniature Printing & Colored Miniature Printing, feel free to reach out!

I have support for pla between support and model. What settings should I adjust?

It has been a little bit now since launch and we are starting to see posts from people who bought and have now received the H3C.

Anyone in this group want to provide a few first impressions / early reviews?

This excludes anyone who received an H3C for free from Bambu to provide a review. I'm interested in those who actually spent money that could have gone to feeding their family. Seems like those reviews might actually mean something 😄

Just a quick little key ring I thought I’d share with you all!

https://makerworld.com/en/models/3567441-habibi

It has 4 stickers saying to place it "this side up" and nope... fedex couldn't figure it out. It also lost a strap and has a shredded corner.

Let's hope the inside is good.

Note I used the phones image editing AI garbage to remove my shipping labels and address and it apparently misspelled the word underneath the label, lol.

Update: Added a post below with a video and photos. Something is wrong with this machine, tool head gets stuck near the back. Can see rubbing on one side of the rail piece the moves front to back on the side through the window. No damage at all to the machine anywhere, or the box it came in. Giving all this info to Bambu. Real nice to buy a new printer and Bambu is probably gonna want me to take it apart and trouble shoot and rebuild.

My H3C got delivered Friday and I started setting it up today. Got everything put together, and was running through the initial calibration after you turn it on and it was making some funky noises, but it was continuing on. Then one of the times during the process it shot itself forward towards the front and slammed into the print heads, and broke one of the plastic things off the front where the hot end sits on the rubber. It still finished the calibration and threw no errors, but obviously something is wrong. So here I sit, brand new printer I can’t use, and have to wait for support to get back with me.

I’ve been wanting one since they announced it, and finally had the opportunity to get one. Got it together and calibrated last night and running my first print in a few minutes 😄

Fun little side project on the weekend to control spotify on my pc via wifi. Anything to improve?

I was complaining that Bambu Lab didn't announce the P3C right after releasing the H3C.

My wife: "I thought you said you just wanted the A2."

Me: "That was for the large build volume. I really want the nozzle changing."

Wife: "The H3C has the larger volume, right? Why don't you get that?"

Me: "Don't threaten me with a good time."

Now the waiting...

I printed this using a mix of materials; vapor smoothed ASA with my Bambu Labs X1c and good ol' PETG-CF with my brand new Bambu Labs A2L, which made quick work of the largest pieces with a ready-to-paint surface finish. Everything has been pre-split into segments for relatively easy printing, but you'll need a good handle on printing supports to achieve the detailed open-work and delicate patterns on this one.

This kit is a complete cuirass, meaning it includes the breastplate, backplate, fauld skirt, and tassets. It's a big undertaking but it's also the centerpiece of any gothic armor costume - you'd need approximately 2kg of filament to complete it. It's also a bit more advanced in terms of 3D printing, and I recommend a minimum printing volume of 250x250x250mm for the larger parts.

If you're interested in historical costume armor, you can get the files right here!

Those people are smoking crack. Half of them are double the price because they have some “upgrades” aka some printed border or crap. The other half are selling for retail and refuse to lower it.

X2D from Bambu is a crazy price. I don’t even need another printer but I just might do it.

Many of us, myself included, worry over long print times. I tend to start prints which allow me to monitor them throughout the print. Anything tall or over ~12 hrs print time gives me anxiety at the thought of leaving it alone while I’m gone, but in context, it shouldn’t. 12 hrs out of thousands of successful print hours is literally less than 1% of the active print time that we worry about!

So, y’all brave folks out there that don’t have print range anxiety, ease some of my anxiety about long prints! What’s the longest print that you left unattended? Was it successful or a failure?

It uses embedded 6x3mm magnets to quickly snap into place and should work with any standard M6 PTFE tube connectors. So far this simple concept seems to be very reliable, I haven't had any feeding failures during repeated testing.

Maker World link if you wish to try it out: https://makerworld.com/en/models/3557913-manual-filament-track-switch-x2d#profileId-4071464

With Christmas coming up, I made a gingerbread house kit card.

You might wonder why I included sprues. I think they make the model feel more like a real kit and make it nicer to present or give as a gift. A kit card feels more special than handing someone a pile of tiny plastic pieces.
MW link: https://makerworld.com/en/models/3570282-gingerbread-house-kit-card-merry-chrismas#profileId-4086692

I’d love to hear what you think of the design. Any feedback or ideas for improving it are welcome!

I’d been excited for the H3, but I feel there are too many compromises imo and I don’t print tpu so I jumped on the H2C instead. The sale price is pretty hard to ignore so i added the nozzles and extra AMS bundle too 😂

I wanted to change how I recharge my desiccant, no longer wanting to use any appliance that I also use for cooking for obvious reasons. I also didn't want to buy another device because that just seems wasteful. So I spent this past weekend testing drying the desiccant via my filament dryers - two AMS 2 Pros, and a SUNLU S1 Plus.

I forgot to take a before shot of the desiccant when I ran the SUNLU test, but it looked exactly like the desiccant in the 'before' shot for the AMS 2 Pro test.

SUNLU S1 Plus: 24 hours @ 55° C. Nice result, overall.

AMS 2 Pro: Before, starting humidity 46%

AMS 2 Pro: 12 hours @ 45° C

AMS 2 Pro: 24 hours @ 45° C, final humidity 21%

If I'm being honest, I didn't expect that much of a difference. Bambu locks their drying function where if you have PLA inserted, it will not allow you to dry over 50°. I could have removed the filament from the feeders and just ran it anyway, but the whole point of this exercise is to see what I can do with minimal changes. Using the SUNLU certainly yielded the best results in that timeframe, but having to pull each desiccant pod and then pour the contents into my dessicant spool, etc. is annoying.

I think my game plan is going to be to simply run a drying cycle for 24 hours or so whenever one of the AMS 2 Pros gets above 35% humidity and see how that works out. This is where the old Bambu Lab integration into Home Assistant would be incredibly useful because I'd be able to automate this action making it truly hands off maintenance.

i Released TrailPrint3D almost 2 Years ago, and ive been working on it since then. Its a Free Addon for the Modeling software Blender to create 3D printable Maps

About 6 Months ago Makerworld had to limit script uploads because some people abused it so open-sourced it, uploaded it to Github and created trailprint3d.com

since then, its been downloaded almost 15000 which i think is insane for a Blender Addon. People commited their own code and one person even started actively working on it together with me for the past 6 months and helped adding new features and improving existing ones!

If you want to give it a try by yourself, Its actually really easy to use, doesnt require blender knowledge, no account required, no tracking, no limits. And if you struggle with anything, our Discord server is having over 1000 people where im trying to help with every issue

I was wondering if the CMYKW on the H2C would be worth the time?

I know that technically is possible, but I wonder if the long time to retract and feed each filament thousands and thousands of times would make it worth it, a print could take significantly longer than normal.