How to Print TPU Flexibles on the Kobra 3 Without Clogs
How to Print TPU Flexibles on the Kobra 3 Without Clogs TPU is rubbery, bendy, and incredibly useful — but it can be a nightmare if you don't slow down. The Kobra 3's direct drive handles it well with the right approach. Why TPU Clogs TPU is soft and compressible. Too much back pressure and it buckles in the feed path before the nozzle. The solution: go slow enough that there's minimal back pressure at all times. Settings Key Rules No ACE Pro for TPU — load single channel direct into the extruder Minimize retraction — TPU compresses instead of retracting cleanly, causing blobs Never exceed 40 mm/s — speed is the number one cause of TPU clogs Keep bowden path clear — any resistance = buckling Shore Hardness Guide If It Clogs 1. Heat nozzle to 240°C 2. Manual extrude slowly — if resistance, stop 3. Do a cold pull at 90°C 4. If blocked, remove nozzle and clear with acupuncture needle Post-Printing TPU parts are sticky — don't stack them. Store flat. PEI release is usually good without glue stick.
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