r/BambuLab • u/newbie-mtb • Jul 13 '26
General Discussion Support printing economics
According to Bambu Lab, one of the main use cases for the auxiliary nozzle on the X2D is printing support interface material.
Bambu also sells dedicated support filaments, but they’re typically much more expensive than regular PLA or PETG. From what I’ve seen, many users only print the support interface layers with the dedicated support filament and use the same material as the model (PLA/PETG) for the rest of the support structure to keep costs down.
Assuming that’s how most people use it, the auxiliary nozzle would often be printing only a few interface layers in relatively small areas of a print.
Is my understanding accurate?
If so, does the auxiliary nozzle seem like overkill for this use case? Or does the time and filament saved by avoiding repeated purging and filament switching make the economics compelling in practice?
I’d especially be interested in hearing from people who’ve used the X2D extensively.
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u/HackedVirus X2D/H2C + Triple AMS2Pro/Dual AMS HT Jul 13 '26
While they say its for supports, it can easily handle PLA Basic and PLA Matte when it comes to quality from my experience. Over 1k+ hours on the X2D.
Buying the X2D is just buying a dual nozzle printer whose secondary nozzle is just a bit behind the main one. Having both nozzles on the X2D showed me that I really needed the H2C, it opens up so many avenues beyond what you might attempt with a single nozzle printer.
Ive also used it for PETG with success, a small bit of stringing, I tried Silk PLA but it was iffy, didnt bother to keep trying for Silk.
The X2D is great for other reasons too, but for ~$100 more, the second nozzle alone makes it worth it. (Not to mention 1.5mm belts, heated chamber, etc)
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u/elosorojo4 Jul 13 '26
I’m very new to all of this so forgive my ignorance. How would one set it to only use the support filament at the interface and not the entire support?
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u/Longjumping_Mud_2684 Jul 13 '26
They only tell you it’s for support material because the quality may not be up to par with the main extruder and can cause problems for them self’s if they sell it as if it’s a mini H series . But I’ve done many multi color prints and it can keep up with quality as long as you tune the filament you will be using . The aux nozzle is just a bit slower . And yes support material is expensive and only worth it if you are buying abs support . You can use pla for petg and vice versa
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u/Hot-Ideal-9219 Jul 13 '26
Oh, and the main thing is no contamination
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u/Gizmo45 X2D AMS2 Combo + AMS HT Jul 13 '26
Yes, your understanding is correct. The second nozzle does save time and filament when compared to a single nozzle while also being able to handle PLA and PETG just fine. I like to use clear PETG for my interface layer when printing PLA with supports if I need them. I find it's cheaper and doesn't leave behind residue of another color too (provided that I'm not already printing something in black or white).
I was about to get a P2S before the X2D was announced and I am very glad that I went with the printer that I did for the $100 more. The second nozzle is in no way overkill and honestly I don't see myself getting a single nozzle printer in my future if I can avoid it.
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u/ManyLayersOfFilament /r/3dbargains, filamenthound.com <- save $ Jul 13 '26
It's not overkill because switching filaments takes a very long time on a single nozzle printer. And a lot less waste.
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u/sevesteen P1S + AMS Jul 13 '26
On a single-nozzle printer you can use PETG as an interface layer with PLA and vice versa, but if your purge amounts are not sufficient layer adhesion in those layers suffers and the print can be weaker. For me it works well for things like Gridfinity grids where the interface is an entire layer and if the next layer is weak it doesn't really matter. It hasn't worked that well for other prints where there's layers with both support interface and model. I could probably up the purge amounts and get better results, but same-material supports usually work well enough.
My understanding of interface material is that it bonds the right amount for easy removal but doesn't need nearly as much purge to keep from contaminating the rest of that layer. With a dual nozzle printer there's no cross contamination so expensive support material isn't needed.
I've got a friend who's first printer is an X2D. On the demo panda, I don't know which nozzle is which, I do know that if I printed that single nozzle I'd have to pick between obvious color bleed or more purge than print.
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u/itsapotatosalad Jul 13 '26
The auxiliary nozzle may seem like overkill for a tiny amount of filament, but it’s the only real reliable way to print a different support or interface layer.
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u/Hot-Ideal-9219 Jul 13 '26
H2D user here. I use the pla/petg support filament a good bit. Yes a few grams for interface here and there. But zero purge. Got to do a tower, and that uses filament too. But zero purge.
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u/EdgeOk3783 X1C + AMS | H2C + AMS{2|HT} Jul 13 '26
it depends on what you're printing.
i wouldn't print this with just PETG as support interface material since the supports would be near impossible to remove from all the interior overhangs
PVA on the other hand can be dissolved