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[SOLVED] Unable to print TPU 93A (self.3dprinting)

submitted 1 year ago* (last edited 1 year ago) by stooovie to c/3dprinting

12 comments fedilink hide all child comments

EDIT: solution is in the comments. TL;Dr retractions ON and INCREASE speed. Both opposite to common knowledge.

I can't print flexible TPU properly. It's either foamy, inconsistent extrusion or jam city, nothing else. I wasn't able to complete a single print properly in a week and probably 50 tries.

Tried

24 hours of active drying
speeds of 10-30mm/s
flow rate 1-1.2 (100-130%)
temps 220-250 (mfg rec is 235-250)
0.4 and 0.6 nozzle
Cura and PrusaSlicer

Direct drive (Biqu H2 V2s) on a well-tuned Ender 3 (no issues with ABS, PETG, even nylon). Part fan off. Printing on PP tape (no adhesion issue).

I can get halfway decent looking print with 250C and a Flow rate of ~140% but it eventually jams anyway. Lower temps give super inconsistent extrusion, nozzle spitting chunks intermittently.

At my wits' end. Any more tips? I don't have any other TPU ATM, may be just shitty filament? It's a cheapo polish F3D Filament TPU 93A. Thanks!

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[–] [email protected] 1 points 1 year ago (1 children)

Are you using a bi-metallic headbreak? I've heard these can make it very difficult to print with TPU (at least with my Volcano style extruder on the Sidewinder X2), though I don't have any experience with it myself.

[–] stooovie 1 points 1 year ago

Yes, this is probably adding to the situation.