Sainsmart TPU Issues

[curious aardvark]

well looks like you are printing too hot.
Says 200-220c on the reel.

Also is this stuff floppier than the other filaments you've used ?

The cheetah is quite firm. No clue on the yoyi.
It might be worth checking your xtruder is optimised for flexible filaments. Most of the extruders used in makerbot clones are NOT optimised for flexibles.

Also what mm/s speed are you ptinting at ?
Flexibles have to be printed at really slow speeds.

With your setup I'd probably go up to 25mm/s MAXIMUM speed.
The advantage of flexibles is that because they stick so well to just about everything you can print the first layer at the same speed as all the other layers :-)

Also have a look through this: https://3dprintboard.com/showthread....n-instructions

[CBK]

Thank you for the response curious aardvark, and for your help. I should have mentioned that I have increased the temp in 5C increments from 190 to 240and I get the same problems every time.

And you were right. I somehow missed including my print speeds as well. With the YOYI and the Cheetah I usually print at 30 mm/s but with this, I have slowed it even down to 15 mm/s but to no avail.

And yes, this stuff is much floppier than I've used. And I notice that when I am loading the filament, the feed is much thinner than with the other flexible filaments I've used. It's like it is struggling to feed it, which would definitely account for the under-extrusion that is happening among the myriad of other problems.

Unfortunately, the link you provided is no longer active or at least wouldn't work when I tried it. :/ The link to the PDF is broken.

At this point, I think I can chalk it up to this stuff is just too floppy for my printer to print well. I believe I will have to make some sort of modification to the extruders in order for it to work.