TPU
I've been trying to print Fillamentum 92A on my kit built MK4S (awesome printer!) and had lots of jams until I raised the Temp. 10 degrees. No other changes including infill. Now it's printing beautifully. Phew!! I LOVE this printer.
RE: TPU
Sorry, I spoke too soon. Jams happened later. Gotta find the right settings, like retraction minimal, detraction slow, Get the right setting on the idler. I still love the printer for all the other filaments, though. I'm starting to think that the gear set up isn't ideal for TPU. In the meantime, my very long TPU print time on my MK3s+ is running smoothly along with never an issue. Don't have to babysit it at all. So, maybe those long print times are OK since I can sleep through them.
RE: TPU
I always slow TPU prints way down without issue. Like all speeds at 40 slow.
My XL does print TPU well if I slow right down - so slow that for pure TPU it's as 'quick' and easy to use my MK3 while the XL gets busy with something else; a very good reason not to update every MK3.
Cheerio,
RE: TPU
Ahh - Great info and great thought. Thanks guys. I wish they made cars this way - upgradable for years and still robustly useable even when a new model is released.
RE: TPU
I don't bother changing my print speeds for TPU, but I do limit speed using a low volumetric flow rate (last time I calibrated volumetric flow for flexibles was on my MK3 for NinjaFlex and came up with 3.61mm^3/sec). By using the filament setting volumetric flow rate I don't need to have a separate print setting for flexibles as the filament setting will take care of that for me. As always, YMMV.
See my (limited) designs on:
Printables - https://www.printables.com/@Sembazuru
Thingiverse - https://www.thingiverse.com/Sembazuru/designs
RE: TPU
I too, am ageting jams with TPU, but these are happening in the nextruder, not the nozzle. It seems the flexible filament is getting wrapped around the planetary and it is a bear to get it out.
Other than slowing things down, any sugguestions? I am considering using my old MK3 for TPU and only use the MK4 for rigid filament.
Senior Life member of IEEE.
RE: TPU
Are you following the suggestions in: https://help.prusa3d.com/article/flexible-materials_2057
- in particular, are you reducing the idler pressure?
Cheerio,
RE: TPU
Thank you. Didn't know the article existed.
I tried printing the TPU on my old MK3/S, but I am having a really hard time getting the first layer calibrated using the first layer calibration in the firmware.
Senior Life member of IEEE.
RE: TPU
For printing TPU on the MK4 I saw this video last year:
I printed the replacement parts linked in the video description in Prusament PC-CF at 0.15 layer height and I had no problems since printing SainSmart TPU 95A and Fiberlogy Filaflex 40D with my MK4.
RE: TPU
I've reviewed the article https://help.prusa3d.com/article/flexible-materials_2057 and checked the speeds in PrusaSlicer for the recommended profiles (Flexfill 98A, FilaFlex 40), they're significantly higher than the 20mm/s recommended in the article. Why the difference? Is there a better profile?
Thanks
RE: TPU
If you have problems with TPU jamming, try this improves idler and main plate.
https://www.printables.com/model/1072020-mk4s-bogie-idler-main-plate