Extruder pulley does not turn during calibration or printing - turns OK only when loading and unloading filament - Hardware, firmware and software help https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/extruder-pulley-does-not-turn-during-calibration-or-printing-turns-ok-only-when-loading-and-unloading-filament/ Prusa3D Forum Discussion Board en-US Thu, 18 Jun 2026 08:04:16 +0000 wpForo 60 RE: Extruder pulley does not turn during calibration or printing - turns OK only when loading and unloading filament https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/extruder-pulley-does-not-turn-during-calibration-or-printing-turns-ok-only-when-loading-and-unloading-filament/#post-547474 Thu, 16 Dec 2021 19:40:57 +0000  

]]> Hardware, firmware and software help heink https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/extruder-pulley-does-not-turn-during-calibration-or-printing-turns-ok-only-when-loading-and-unloading-filament/#post-547474 RE: Extruder pulley does not turn during calibration or printing - turns OK only when loading and unloading filament https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/extruder-pulley-does-not-turn-during-calibration-or-printing-turns-ok-only-when-loading-and-unloading-filament/#post-547321 Thu, 16 Dec 2021 14:59:20 +0000 Any clicking sound? Maybe a video may help diagnose it. 

]]> Hardware, firmware and software help FoxRun3D https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/extruder-pulley-does-not-turn-during-calibration-or-printing-turns-ok-only-when-loading-and-unloading-filament/#post-547321 RE: Extruder pulley does not turn during calibration or printing - turns OK only when loading and unloading filament https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/extruder-pulley-does-not-turn-during-calibration-or-printing-turns-ok-only-when-loading-and-unloading-filament/#post-547306 Thu, 16 Dec 2021 14:44:39 +0000 Is the extruder temperature above 170c. This is the low temperature extrusion limit

 

Regards Joan

]]> Hardware, firmware and software help JoanTabb https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/extruder-pulley-does-not-turn-during-calibration-or-printing-turns-ok-only-when-loading-and-unloading-filament/#post-547306 RE: Extruder pulley does not turn during calibration or printing - turns OK only when loading and unloading filament https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/extruder-pulley-does-not-turn-during-calibration-or-printing-turns-ok-only-when-loading-and-unloading-filament/#post-547300 Thu, 16 Dec 2021 14:36:30 +0000 Could a filament sensor malfunction cause this?  

]]> Hardware, firmware and software help heink https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/extruder-pulley-does-not-turn-during-calibration-or-printing-turns-ok-only-when-loading-and-unloading-filament/#post-547300 RE: Extruder pulley does not turn during calibration or printing - turns OK only when loading and unloading filament https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/extruder-pulley-does-not-turn-during-calibration-or-printing-turns-ok-only-when-loading-and-unloading-filament/#post-547294 Thu, 16 Dec 2021 14:35:25 +0000 the shaft and pulley are tight and will only turn at  load or unload filament

]]> Hardware, firmware and software help heink https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/extruder-pulley-does-not-turn-during-calibration-or-printing-turns-ok-only-when-loading-and-unloading-filament/#post-547294 RE: Extruder pulley does not turn during calibration or printing - turns OK only when loading and unloading filament https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/extruder-pulley-does-not-turn-during-calibration-or-printing-turns-ok-only-when-loading-and-unloading-filament/#post-546760 Wed, 15 Dec 2021 17:30:28 +0000 Ok, pulley is not turning.. but does the extruder motor shaft rotate? If yes, then you need to check if pulley is properly fixed on motor shaft (one grub screw must be tightened on shaft flatness).

]]> Hardware, firmware and software help BogdanH https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/extruder-pulley-does-not-turn-during-calibration-or-printing-turns-ok-only-when-loading-and-unloading-filament/#post-546760 Extruder pulley does not turn during calibration or printing - turns OK only when loading and unloading filament https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/extruder-pulley-does-not-turn-during-calibration-or-printing-turns-ok-only-when-loading-and-unloading-filament/#post-546748 Wed, 15 Dec 2021 17:09:55 +0000 Following  a filament runout event,  the extruder pulley only turns when inserting or withdrawing filament. I've replaced the nozzle, heatbreak, & PTFE tube.  The filament  extrudes nicely during the initial  Load Filament stage, and the pulley works when unloading the filament also.   During first layer calibration  The pulley is definitely not turning at all, and the PLA filament only seeps out of the nozzle under the heat. 

]]> Hardware, firmware and software help heink https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/extruder-pulley-does-not-turn-during-calibration-or-printing-turns-ok-only-when-loading-and-unloading-filament/#post-546748