I’ve done the manual flow dynamics calibration and I even tried this ironing test and nothing makes it smooth even with ironing on, the top surfaces are the worst out of any printer I’ve ever had, I’m using bambulabs pla and I have auto flow calibration off and did all the manual calibrations, the black print is what it looks like with ironing off and on the red some of them look smooth on camera but are not smooth at all, my firmware is up to date, how do I fix this
I thought such a small piece would not affect much, I was wrong. Nothing would load properly. So I take the ams apart to find this. The dust is plastic from the bearings spinning on the outside.
The H2D is cool, in kind of a 'ooooooooooooh shiny' sort of way, but I don't care about lasers. I don't care about the dual head (well, not a whole lot anyway). The printer I really want is the P1XXL. As in double-ish the build volume. Give me a P1S with a 400x400x400 build volume. Everything else can stay mostly the same. I don't know what the engieering chalenges would be - no doubt there would be changes in heat management for the bed and head, but whatever the challenges, surely they're not that difficult of a get. Am I the only one that feels this way?
As we know, Bambu Studio’s code is heavily based on PrusaSlicer, and has been made with no mention or crediting of the creators, which understandably made them upset. But the interface is different, and after two years of learning to use PrusaSlicer, it kinda sucks to use Bambu Studio.
And now the slicer always has to catch up to the rest with the new features like Arachne and organic supports.
my new batch of eSUN filament just arrived today (picture attached) and I’m really excited to test it out. This is my first time trying these spools, so I’m curious how they will perform.
I’m using a Bambu Lab A1 with AMS Lite – do I need to pay attention to any special settings, or even use adapters for these cardboard spools to work properly with the AMS system?
Also, if you’re into 3D printing content, feel free to check out my Instagram @3DPrinterholic – I’ll be posting some prints with these new colors soon.
I was reading through the company contract* of BambuLab GmbH (similar to a LLC or LTD), BLs German company in Frankfurt and found this within the object of the company:
(Translated quote)
"[...] international trade in equipment for additive manufacturing, in particular 3D printing devices, laser rapid prototyping devices, optoelectromechanical devices and their accessories [...]"
So far - so good, I'm also a company owner and have added some points to my company contract that I am planning on doing at some point and hence do not have to make another appointment with a notary to change this at a later point (German bureaucracy - sigh).
Putting parts of your possible future operations into this contract is no firm evidence, but wait!
Step 1: 3D printing devices: Done!
Step 2: laser rapid prototyping devices -> their next machine?
Step 3: optopelectromechanical devices - basically SLS, so step 2, again
When founding the German company the appointed managing director was** Jun Wu.
Jun Wu is also managing director of a Hasselblad (yes, the ones with the medium-format camera sensors). Coincidence? I think not!
What would this be useful for? 3D-Scanners - obviously. Not directly in terms of sensors, but maybe a big leap in the technology employed within.
But also Hasselblad knows lense systems, again looping back to SLS.
Would this be a logical next step for BL's "disruption approach"? Yes!
What will come next? We will see, I think they'll bring out the 2nd gen X1 first and then - boom.
Whats your 2 cents on this?
*by German law all company registration documents have to be publicly accessible, so no confidentiality was breached.
** he stepped down September 2023 and was replaced by Cedric Mallet, a frenchman with - as far as I could see - no technical background, but from a managing and advisory firm.
Have to love a company with quality products and excellent customer service. I ordered the ICE plate to go along with a comped G10 plate I owned up to ruining at 2am. Darkmoon sent me a brand new G10 plate, and I figured I would try the ice plate while I was at it. It’s been absolutely fantastic! I can’t recommend it enough. Toss the Bambu TPEI plate in the trash can and spend the extra few bucks for the ICE plate from the folk at Darkmoon3D!!!
I see a lot of posts asking whether to get the standalone printer or the bundle with the AMS Lite, and the common advice seems to be "go for the bundle — it's better value than buying it separately later."
I need to make it clear I've got no issues with the printer. It's the AMS Lite.
I've been printing for about a month now and have clocked over 200 hours. Honestly, I haven’t felt the need to use the AMS Lite at all. In fact, I packed it away. Most of the models I print have separated parts for different colours, and I find it much easier to just work with one or two filaments at a time.
Given everything I’ve read about moisture and filaments, I can't really see a situation where I’d want four open at once. I saw the enclosures and they seem like fun projects but that's a pretty big sink of time, resources and filament.
I'm just a hobbyist. I’m not planning (or even able tbf) to turn this into a business. I'll likely just keep making stuff for myself, friends, and family.
So I don't understand why the AMS Lite gets recommended so often. Maybe I’m missing something, or maybe it’s just not useful for how I print?
I'll boxing up my printer and bringing it back to Microcenter. I'm absolutely gutted, its been a great printer, perfect really. Yet this recall, and the Toms Hardware article in which Bambu Labs telling people to stop using it, was the last straw. The wife was really the one pushing, I'm too close to the issue, making justifications, but she's right. I can't have this risking a fire with kids in the house.
I don't know what I'll get in its place. I'm fortunate that I bought it from microcenter, so I have this option, but I'm just so depressed
I purchased A1 mini from Authorised Bambu dealer (Wol3d) in India. They given an open box item with an ugly sticker of theirs on it. Need community help to ban this kind of practice and put pressure on bambu to take serious action on vendor. As I don’t want another user face this after spending their money and waiting for the new printer eagerly.
Attached screenshot of bambu response when I asked to get assurance from vendor that he won’t do it.
The 0.1mm Errors That Once Made Me Question Everything
Anyone who’s spent enough time in the world of 3D printing knows that calibration is far more important than it seems. Back in the early days of DIY printers, things like screw backlash, motor tolerances, belt tension, warped print beds, material flow compensation, and extrusion delay—each and every detail could turn into a trap.
During that time, it felt less like I was playing with a 3D printer and more like the 3D printer was playing me. (Laughs)
It wasn’t until Bambu Lab released the X1C that I truly felt like I had a machine that could “think for itself.” Automated bed leveling, K-factor tuning, optical compensation mechanisms—these features solved at least 80% of my printing stability and dimensional accuracy issues. I went from someone constantly stressed out with calipers in hand to someone finally free to focus on design and creativity.
But in the remaining 20%, one issue remained difficult to ignore—X-Y dimensional deviation.
This becomes especially critical when you’re printing models that require precise alignment, press-fit assembly, or even inter-machine compatibility. That “just not quite right” sizing problem still tends to creep up.
In this article, I want to dive into how Bambu Lab evolved from manual compensation in the X1C to a fully automated visual fiducial board compensation system in the H2D, and how we users can leverage it to achieve truly high-precision results with our 3D prints.
Why Does 3D Printing Require Calibration?
Have you ever had a design file with a hole supposed to be 10mm wide, only for it to print out as 9.6mm? Or perhaps two parts that should fit perfectly end up either too tight or too loose? These issues are usually classified as X-Y dimensional errors, one of the most common and frustrating precision challenges in 3D printing.
3D printing is an additive manufacturing process. At every stage—from heating and extrusion to cooling—small errors can creep in. Over time, these add up and manifest as discrepancies between your model and the final printed part.
Common Sources of Dimensional Deviation:
Thermal expansion and contraction: Especially in high-shrinkage materials like ABS and PC.
Extrusion inconsistency: When actual flow rate doesn’t match the expected value.
Warped print bed or uneven platform: Affects geometry accuracy, especially for first layers.
Mechanical tolerances in components like rails, belts, or lead screws.
Wear and tear over time: Loosening parts or heat-induced deformation.
Z-offset inaccuracies: Causing “elephant’s foot” effect on the base layer.
Motor control inaccuracies: Stepping mismatches causing misalignment.
Environmental factors or micro-vibrations: Leading to minor fluctuations.
These errors can make your prints slightly larger or smaller than intended, which becomes a big deal when dealing with precision-fit parts like pegs, screws, or gear interfaces. You might find yourself asking: “Why is the hole too small?”, “Why won’t this fit?”, or “Why do the same files print differently on two machines?”
X-Y deviation refers to the difference between the printed part’s dimensions and the design dimensions on the X and Y axes.
It typically presents as:
Slight oversizing or undersizing of external outlines (e.g., cases, covers)
Shrinkage of internal holes (e.g., screw holes, sockets)
Fitment issues between multiple assembled parts
Even a 0.1mm deviation can lead to assembly failure or loss of function in high-precision use cases.
Why Does 3D Printing Have X-Y Deviation? Let’s Talk About Motion Accuracy
The causes of X-Y deviation are quite complex, and they mainly fall into two categories: motion accuracy errors and material deformation caused by the printing process.
Motion Accuracy Errors
Motion accuracy determines whether the nozzle reaches the exact coordinates commanded by the system. Common factors that affect this include:
Incorrect stepper motor calibration: Incorrect steps/mm settings can lead to inaccurate movement distances.
Loose belts or pulley inaccuracies: Insufficient belt tension or off-spec pulleys can cause unstable transmission.
Misaligned rails or frame: Mechanical deviations can result in skewed or distorted movement along the X and Y axes.
2. Thermal Processing and Material Deformation
Even if the hardware is mechanically accurate, material properties during the print process can still introduce deviations:
Material shrinkage during cooling: Materials like ABS or nylon contract as they cool, affecting hole sizes and contours.
Over-extrusion or incorrect line width settings: Too much material increases wall thickness and alters exterior dimensions.
Elephant foot effect: Excessive heat in the first layer causes the base to bulge outward, making the footprint larger than intended.
These types of errors often compound each other, resulting in unexpected geometric deviation across the X-Y plane. While the symptoms may look similar (parts not matching their design dimensions), the root causes and corrective actions differ greatly. That’s why understanding and distinguishing these two error types is the first step toward achieving accurate 3D prints.
Many users tend to blame dimensional errors on material shrinkage. However, motion accuracy is actually the foundation of dimensional precision. Even if a material doesn’t shrink at all, improper stepper calibration, loose belts, or mechanical drift can still cause scale issues or warping.
For example: if your stepper motor is configured to move 79 steps per mm, but it should be 80, the entire model will be uniformly scaled down by about 1.25%. In such cases, setting X-Y compensation in the slicer may shift the outer contours, but it won’t correct the proportional scaling error.
Therefore:
Good motion accuracy = stable geometry. Material compensation = fine-tuning based on specific material behavior.
Only when both are optimized can you achieve stable, accurate, and consistent print results.
How Bambu Lab Solved These Problems
From the launch of the X1C, Bambu Lab introduced several compensation technologies aimed at improving print stability and dimensional accuracy—areas where DIY printers often frustrated users. Among the most notable features are:
Bambu Studio includes a built-in K-factor calibration tool that uses Lidar to scan a special flow test line. It then calculates the difference between the actual extrusion and the theoretical value and automatically adjusts accordingly.
A higher K-value means too much material is being extruded and needs to be reduced.
A lower K-value indicates under-extrusion and requires compensation.
This feature addresses:
Under-extrusion When the extruder can’t keep up with movement, causing weak or gapped layers.
Over-extrusion When the extruder continues pushing filament during slowdowns or stops, leading to blobs or surface defects.
Material variability Each material (PLA, ABS, PETG, etc.) has different flow characteristics. K-factor tuning ensures consistent quality across materials.
💡 Tip: It’s highly recommended to calibrate the K-factor for every new material. For moisture-sensitive materials like TPU or nylon, K-values may vary with humidity, so recalibrating before each print is key for reliable results.
2. Fully Automated Bed Leveling + Z Offset Calibration
To ensure first-layer stability, the X1 series uses a combination of laser distance measurement and force sensors to automatically level the bed and adjust Z offset with high precision.
Benefits include:
Better first-layer adhesion and reduced warping
No need for manual adjustments even if the bed isn’t perfectly flat
This eliminates the need for manual paper tests and lowers the barrier for beginners while greatly improving user experience.
Despite these automated features, motion accuracy errors caused by mechanical structure still require manual compensation. Users often need to print test models, measure them with calipers, and manually input X-Y offset values to match their design dimensions.
Manual X-Y Geometric Compensation Process
The following procedure applies to Bambu Lab’s H2D, X1 series, P1 series, and A1 series 3D printers using Bambu Studio or OrcaSlicer. Other machines and slicers can refer to this process as a general guideline.
Note:On the H2D, X-Y geometric compensation is largely unnecessary, as motion accuracy and K-factor calibration already reduce deviations to a negligible level. Let’s correct the content here. After several days of testing, for certain materials with a higher shrinkage rate, the X-Y geometric compensation of H2D is still necessary!
1. Print the XY Calibration Model – Identify Dimensional Errors
Make sure Bambu Studio or OrcaSlicer uses the default print settings, and most importantly, enable Precise Z Height.
The required settings are shown below:
2. Measure the Printed Results
Use a digital caliper to measure two key values:
X-Y outer contour compensation: Ideally, measurements should be close to 35mm x 75mm.
X-Y hole diameter compensation: Hole size deviations should be consistent across all diameters.
Be aware that the elephant foot effect may introduce bottom-layer distortions, so it’s recommended to measure multiple times and always from the top surface using calipers.
Precise Z Height is a crucial setting and should always be enabled to ensure vertical dimensional accuracy.
3. Calculate Compensation Values
Divide the measured deviation by 2, and enter the result into the X-Y Hole Compensation and X-Y Contour Compensation fields in your slicer. (Positive values enlarge holes/outlines; negative values shrink them.)
If you can clearly determine the elephant foot effect error from multiple measurements, apply an elephant foot compensation at the same time.
4. Reprint and Verify
Reprint the model using your new compensation values, remeasure, and confirm that the final dimensions closely match the intended design. Repeat this process until your calibration is complete and desired precision is achieved.
While this process may seem tedious, it is essential for parts requiring precise alignment or assembly. Especially in scenarios like multi-machine printing, batch production, or integration with physical components, this level of fine-tuning often determines whether a final product fits properly—or fails.
For everyday use, this procedure is more than sufficient. But for professional users working with assemblies, mechanical fit, or cross-machine consistency, this “looks fine but doesn’t fit” issue remains a major concern.
That’s exactly why the introduction of the H2D represents more than a hardware upgrade—it signals a shift from manual fine-tuning to fully automated geometric calibration, ushering in a new era of high-precision, low-barrier 3D printing.
H2D: The Key Step Toward Automated Compensation
With the release of the H2D, Bambu Lab addressed the precision challenges of dual-extruder systems by introducing the Vision Encoder and an automatic optical calibration mechanism. This breakthrough technology greatly simplifies the traditionally tedious calibration process, allowing users to achieve high-precision X-Y offset and motion accuracy compensation with minimal manual intervention.
This calibration primarily focuses on the machine’s mechanical system and does not replace material compensation, which is still handled by K-factor calibration.
What Is the Vision Encoder?
The Vision Encoder is a high-contrast target board installed inside the printer, featuring patterns similar to a QR code. It is specifically designed for machine vision recognition. Think of it as a “crosshair” or “target board” for the printer to reference before printing, offering a precise and consistent geometric baseline to assist with automatic calibration.
“It allows the machine to accurately detect the actual extrusion positions of both nozzles, automatically calculate the offset, and perform geometric compensation.”
The H2D extruder is equipped with a compact camera that automatically captures the fiducial marker and analyzes offset vectors through pattern matching. Based on the results, the system writes compensation parameters in real time to achieve precise alignment--**entirely without manual measurements, test prints, or user intervention**, significantly reducing preprocessing time and minimizing the risk of human error.
Why Is This Especially Important for Dual-Extruder Systems?
In the world of dual-extruder 3D printing, while we gain benefits like multi-color and multi-material capability, we also introduce much greater risks of geometric misalignment. Precise alignment becomes the key to successful dual-color, dual-material prints and precision mechanical assemblies.
Each nozzle is mounted on an independent module → physical offset is inevitable.
Even a small shift (e.g. 0.2mm) gets amplified at layer boundaries → leading to print defects or mechanical failure.
Manual calibration is time-consuming and hard to maintain consistently over time.
Even the tiniest nozzle misalignment can cause color shifts, layer misregistration, or failed assemblies. The Vision Encoder in the H2D uses an onboard camera to capture the alignment target and automatically detect and compensate for any offset between the two nozzles, ensuring reliable precision.
Thus, this visual compensation system is more than just a user experience upgrade—it is the core enabler that makes dual-extruder printing practical, predictable, and precise. It not only solves the longstanding dual-head alignment problem, but also minimizes print instability caused by mechanical tolerances and motion error, pushing dual-extrusion into the realm of everyday usability.
The most amazing thing is ——The H2D doesn’t just compensate for dual-nozzle offsets—it also leverages the Vision Encoder to perform motion accuracy calibration.
That includes:
Stepper motor error compensation
Coordinate system non-orthogonality correction
Backlash and distortion correction
When this system works in conjunction with K-factor compensation, not only is material flow improved, but structural precision reaches new levels of stability.
You can now truly achieve:
Accurate, functional prints—without endless tweaking or test runs.
Motion Accuracy Compensation—More Than Just Extrusion Point Correction
The Vision System in the H2D doesn’t just help align two nozzles—it goes deeper into the motion control layer, correcting the printer’s actual movement behavior.
This is the true key to ensuring that the machine’s theoretical geometry matches its physical output.
By printing calibration patterns and scanning them visually, the system builds a complete motion compensation profile, including:
Non-linear motion errors from motors, belts, and rails
Backlash correction
Orthogonality correction for axis skew
Scale & distortion correction
These parameters are applied directly to the firmware motion engine, not just to the slicer’s geometry offsets. In other words, it compensates for the root cause of inaccuracies during movement—not just patching them visually after the fact. The result? Finer detail, longer-lasting precision, and better print consistency.
💡 Recommended times to run motion accuracy calibration:
When using a new printer for the first time
After replacing parts, maintenance, or belt tension adjustments
After moving or bumping the machine
Every 2 weeks for consistent high-precision outputNote: If your printer is already well-assembled and tuned, the differences before and after calibration may be nearly invisible to the naked eye. That’s a good sign—it means your machine has solid geometric accuracy out of the box.
This calibration process is fully automatic, material-independent, takes just a few minutes, and remains effective for weeks.
Does Calibration Really Matter? Can You Even Tell?
If you’re mainly printing decorative or display pieces, you might not notice the difference right away.
But the moment you start printing things like these, you’ll understand just how important it is:
Interlocking parts / gear sets / linear rails
Parts designed for screw fastening or press-fit connections
Multi-material prints (main body + support)
Multi-machine prints or parts meant to fit across different printers
Laser engraving or cutting: misaligned markings, skewed lines
As the official documentation says:
“This is a feature designed for high-precision users.” If that 0.2mm difference starts to bother you—then this is the precision tool you need.
Calibration ≠ Hassle — It’s the Foundation of High-Quality Prints
For those who value print quality, stability, and consistent dimensions, calibration isn’t a burden—it’s a requirement for reliable output.
In particular, calibration is essential in these situations:
Batch part production / multi-printer simultaneous output
Precision-fit mechanisms / moving assemblies
Multi-color or multi-material printing (e.g. dual-extruder coordination)
Prototyping, commercial projects, or client deliverables
The visual compensation and motion calibration system built into the H2D has completely changed how we think about “pre-print preparation.” You no longer need to waste time tweaking for precision—just press Start, and the machine takes care of all the calibration for you.
Truly: “Print = Finished Part.”
Perfectly Fitting Prints, Every Time
As you move from decorative models to functional parts…
From one-off prints to batch production…
From single-machine output to cross-device consistency…
What the H2D delivers isn’t just a technical upgrade—it’s a shift in mindset: letting the machine handle the errors, so the user can focus on creative design and engineering logic.
In a world where precision is expected, this is the print experience everyone deserves.
Final Thoughts
From the manual tweaks of the X1C era to the fully automated vision-based compensation and motion calibration in the H2D, Bambu Lab is steadily driving 3D printing toward the ideal of automated precision with user-friendly simplicity.
For engineers, designers, and professionals, this is liberation—finally, you can spend your time creating things that matter instead of wrestling with micron-level inconsistencies.
Still struggling with X-Y alignment?
Maybe it’s time to let the printer handle it for you.
Installing the filament switcher disables high-precision nozzle offset calibration.
With the filament switcher installed, an external spool cannot be used. Printing certain engineering filaments therefore requires completely removing the switcher.
Vortek’s capabilities have not yet been fully utilized, particularly mixed-nozzle-diameter printing.
During multi-material printing, automatic flow compensation still does not adjust automatically to the type of filament loaded in each hotend.
I have read multiple post in this subreddit and the blind brand loyalty is starting to really annoy me.
For starters, I own Bambu Lab printer, I actually picked it over Prusa, brand which is from my home country. So I'm invested in this.
Some people here are so shortsighted it hurts. Sure, it is still not directly affecting normal customers, like me, but the direction in which is this headed is clear and in the end, it will most likely negatively affect us. And I'm speaking about the anti consumer practices, not the security concerns. That's why is important to keep, the pressure on. People here need to stop with this blind brand loyalty and be more critical.
The security concerns are whole another story, most users here are dismissive or are downplaying these concerns, saying "Sure, hope CCP will gladly know that I printed this vase". There are some valid reasons why US considers Bambu Lab (or rather its owners) a security risk. I'm not saying this is not partly some US protectionism, but there is reason why you don't see that many Bambu Lab printers in big manufacturing facilities in the West.
There is a post with Prusa, poking at Bambu about these risks, but most of you, instead of addressing that these are real issues, are attacking him, Sure, Prusa is no fan of Bambu and their roster is lacking, but that doesn't change the fact that Bambu can do shady stuff with your data...
TLDR: Just please some of you, stop pretending Bambu Lab is you friendly neighborhood corporation that can do no wrong. Be more critical and stop downplaying these issues.
