Hello,
As per my knowledge, You can follow few additional things to consider:
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Ensure that the tension on your extruder is not too tight or too loose. Too much tension can cause the filament to deform, and too little can cause it to slip.
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Even if it looks fine, the PTFE tube might have developed some internal wear, which can increase friction over time. Try replacing it to see if that makes a difference.
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TPU is prone to heat creep, which can soften the filament before it reaches the nozzle, causing it to jam. Make sure your cooling fans are working correctly and consider adding additional cooling if necessary.
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Since your other machines with all-metal hotends handle TPU well, upgrading your J1 to an all-metal hotend might help. This would reduce the possibility of heat creep and improve overall filament flow.
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TPU can be sensitive to retraction settings. Try reducing the retraction distance and speed slightly to see if it reduces the clicking.
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Ensure the filament path is as smooth as possible. Any additional friction can cause issues with flexible filaments like TPU.
And also check this : https://forum.snapmaker.com/t/j1-j1s-clogging-issues-and-new-hotend-kit-updatqliksense given your setup and the adjustments you’ve already tried, upgrading to an all-metal hotend might be the most straightforward next step. It could help mitigate some of the issues you’re experiencing with TPU.
I hope this helps!
Respected community member!