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#PrintClinic #Questions I was printing TPU 90A on my H2D. The print finished successfully, but when I tried to unload the filament, the extruder started clicking and the filament would not unload.
I disassembled the extruder and checked the Dual Extruder Filament Guide, but found nothing stuck inside. I reassembled everything, but the extruder kept clicking.
I also inserted the small needle tool into the nozzle path, and it went in without any resistance, so I don’t think the nozzle is clogged.
My guess is that the problem is somewhere higher up in the filament path. Does anyone know how to fix this or have a tutorial I could follow? Thanks!
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@Cheeseboiiii : try to do a cold pull
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@Cheeseboiiii : : you’re welcome
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@PAT0_BANAN0 : Fixed! Thanks u so much!
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@CharliePrintz : its bent
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@PAT0_BANAN0 : ok, thanks!
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@Yeona : How to Fix it:
Method 1: Flush it down (Recommended)
Heat the nozzle to 240°C - 250°C and wait a minute.
Do NOT use "Unload". Use the screen to "Extrude" while gently pushing the TPU down by hand.
Once it flows smoothly out of the nozzle, cut the TPU at the top. Feed a stiffer filament (like PLA) directly behind it to completely push the remaining TPU out.
Method 2: Manual hot pull
Heat the nozzle to 240°C.
Manually press the extruder tension arm (to release the gears).
Give the TPU filament a firm, steady pull upwards by hand.
Hope this helps! Feel free to let me know if it works.
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@PAT0_BANAN0 : Thanks u! I fixed it.
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@Yeona : Your guess is partially correct: the nozzle hole itself isn't clogged, but the issue is definitely between the extruder gears and the heatbreak (throat).
Why is this happening?
TPU is a very soft and elastic material. When the printer tries to automatically "unload" filament, it pulls it upwards relatively quickly.
When the melted tip of the TPU is pulled up into the upper, cooler part of the hotend (the heatbreak), it cools down and forms a thick, bulbous blob. Because TPU is squishy, the extruder gears can't grip it tightly enough to force this fat blob upward through the tight tolerances. Instead, the gears just slip or the motor skips steps, which causes the "clicking" sound.
The filament guide (your 2nd photo) is empty because the filament hasn't even made it up that high yet. It is stuck immediately below the gears.
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@turtleprinter1 : make sure you nozzle is heated and you use the controls to pull it out instead of doing it manually
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@wind_ : idk anything about tpu
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