3DPrinting

15607 readers

230 users here now

3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.

The r/functionalprint community is now located at: [email protected] or [email protected]

There are CAD communities available at: [email protected] or [email protected]

Rules

No bigotry - including racism, sexism, ableism, homophobia, transphobia, or xenophobia. Code of Conduct.
Be respectful, especially when disagreeing. Everyone should feel welcome here.
No porn (NSFW prints are acceptable but must be marked NSFW)
No Ads / Spamming / Guerrilla Marketing
Do not create links to reddit
If you see an issue please flag it
No guns
No injury gore posts

If you need an easy way to host pictures, https://catbox.moe may be an option. Be ethical about what you post and donate if you are able or use this a lot. It is just an individual hosting content, not a company. The image embedding syntax for Lemmy is ![](URL)

Moderation policy: Light, mostly invisible

founded 1 year ago

MODERATORS

TPU slips from extruder - why? [Prusa MINI+] (self.3dprinting)

submitted 10 months ago* (last edited 10 months ago) by PlutoniumAcid to c/3dprinting

5 comments fedilink hide all child comments

edit: solved by printing at 20% of regular speed. This seems to give the filament enough time to ooze out of the nozzle, and the print result was excellent.

My Prusa MINI+ works like a charm, except with TPU. We have a 5-hour print task that starts well but fails after 2-3 hours because the TPU filament is no longer being pushed into the nozzle; instead it comes out of the extruder!

What could be causing this? Is the TPU just too soft and bendy? Is the shape of the extruder housing at fault?

It looks as if the TPU gets stuck and is then pushed into the extruder housing when the extruder continues to push. This happens again and again, but it's weird that it works well for hours before failing. The object is basically just a long block, so absolutely straightforward and no retractions.

We have checked that the nozzle is clean and has no obstructions. We have opened the extruder every time it happens, and there's no obvious problem to see (see photo 2 here).

We are considering to print a new lid for the extruder housing, see photo 3 here: (1) is the exit hole, and (2) is the cavity where the TPU ends up so it might help to change the lid (3) to a shape that does not leave a cavity there. Or is the problem that the roller (4) is too narrow or too soft?

For reference, the filament is Tinmorry black TPU from Amazon.

you are viewing a single comment's thread
view the rest of the comments

[–] jagoan 15 points 10 months ago

That looks like it's not melting fast enough for the extruder speed. Try higher temp, or slow it down, or both.