Hey guys,

I've been trying for a while to hone TPU printing through an UP Mini.

I am using Feetek's 'Flexible' which is a TPU advised for printing at 200-210 degrees.

Using a physical temperature hack I had experimented with printing between 200 and 280, with my best results surprisingly coming at 250 degrees. Some of these prints were very clean and practically perfect though lately the printer has started to clot and is extruding small lumps at a time connected by spider like webbing.

To fix this you can withdraw the filament and start again though the print will only last 10 minutes maximum before it starts to clot again.

I have replace the print head, the nozzle and tried several different printers and am also using an A-frame to hold the material above to reduce friction.

Any advice on what I could try next would be much appreciated, I'm stumped at it has only recently started happening and my supervisor at university has not come across this problem on his machine.

10.jpg
(Good print)
9.jpg
(Failed print)
8.jpg
(Failed print)