How to print Prusament TPU 95A
Hi!
Could someone point me to an explanation for how to print Prusament TPU 95A on the CoreOne+ ?
According to Prusa's blog post it should just work. To quote: "Easy printability: No idler tweaking and flawless printing with the Nextruder!", so I assume I am doing something wrong.
I cannot get it past the filament sensor at the extruder without removing the PTFE tube, which is a hassle and also probably not great for the parts to do that a lot.
When I remove the end of the PTFE tube from the extruder, I can feed the filament through the sensor by hand.
However, it still won't print. The Nextruder just chewed up the end of the filament, requiring manual intervention to unload it.
I have read other posts on here that are suggesting various tweaks to the printer. I am at a loss for what to actually do.
Is it a better idea to just shelve the filament until the INDX upgrade comes out and hope that it works better with that?
Thank you!
RE: How to print Prusament TPU 95A
Maybe that thread is of help to you?
I try to give answers to the best of my ability, but I am not a 3D printing pro by any means, and anything you do you do at your own risk. BTW: I have no food for…
RE:
Some flexible filaments are stickier/grippier than others and build up friction inside the PTFE tubes. In that case it pays to mount the spool above the printer and bypass the delivery tubes by feeding it directly to the toolhead - yes you are uncoupling the end of the PTFE from the extruder but that's why it's mounted that way.
And the no-idler-tweaking is sort of true; You will probably need to tweak the setting the first time you use TPU but then that setting can be left in place for (nearly) all other filaments. Keep careful count of the idler screw turns - you may be only a fraction of a turn off and it's easy to overshoot so you need to know how far to undo if you need to go back.
The thread linked to by @justme3d is for much softer filament than you are trying so you shouldn't need all of it.
And the big secret for all flexible filaments - print slowly.
Cheerio,
RE: How to print Prusament TPU 95A
Maybe that thread is of help to you?
That thread gave me the idea to unscrew the PTFE tube, which at least got me a little further I guess?
Some flexible filaments are stickier/grippier than others and build up friction inside the PTFE tubes.
I did not feel any noticeable friction from pushing the filament through the tube. That's of course not exactly scientific, but it felt really no different from pushing PLA filament through.
The first issue I encounter is that the physical resistance of the filament sensor in the extruder is too strong. I should probably have made that more clear in my first post. I simply can't build enough force through the filament to push it past the sensor while it's going through the tube.
And the big secret for all flexible filaments - print slowly.
So far I just assumed that using the profile Prusa provides in Prusa Slicer would do the trick. Assuming that I can ever get the filament to load, should I tweak the settings further?
RE: How to print Prusament TPU 95A
And the big secret for all flexible filaments - print slowly
And dry the heck out of the filament.
Formerly known on this forum as @fuchsr -- https://foxrun3d.com/
RE: How to print Prusament TPU 95A
the physical resistance of the filament sensor in the extruder is too strong
There's at least one Nextruder modification on Printables that replaces the spring with a magnet.
https://www.printables.com/model/1263406-nextruder-filament-sensor-magnet-mod
I was contemplating installing it but I used that same guy's spring-to-magnet mod for the XL side sensor and didn't see any meaningful change in force required to get the filament through.
Formerly known on this forum as @fuchsr -- https://foxrun3d.com/
RE: How to print Prusament TPU 95A
the physical resistance of the filament sensor in the extruder is too strong
There's at least one Nextruder modification on Printables that replaces the spring with a magnet.
https://www.printables.com/model/1263406-nextruder-filament-sensor-magnet-mod
I was contemplating installing it but I used that same guy's spring-to-magnet mod for the XL side sensor and didn't see any meaningful change in force required to get the filament through.
Formerly known on this forum as @fuchsr -- https://foxrun3d.com/
I did not feel any noticeable friction from pushing the filament through the tube.
The extruder isn't pushing, it's pulling; if it grips at bends the pull causes the grip/friction to increase.
should I tweak the settings further?
Prusa's presets are usually good so start there but the first thing to try with all flexible filaments if problems occur is - slow down.
And @foxrun3d is right; dry your filament.
Cheerio,