Filament sensor test failure - Assembly and first prints troubleshooting https://forum.prusa3d.com/forum/prusa-core-one-assembly-and-first-prints-troubleshooting/filament-sensor-test-failure/ Prusa3D Forum Discussion Board en-US Wed, 13 May 2026 01:09:28 +0000 wpForo 60 RE: Filament sensor test failure https://forum.prusa3d.com/forum/prusa-core-one-assembly-and-first-prints-troubleshooting/filament-sensor-test-failure/#post-776593 Sun, 04 Jan 2026 14:59:44 +0000 OK, found out that i had to push the filament all the way to the extruder gearbox and feel it going in. Test now passed...

]]> Assembly and first prints troubleshooting René https://forum.prusa3d.com/forum/prusa-core-one-assembly-and-first-prints-troubleshooting/filament-sensor-test-failure/#post-776593 Filament sensor test failure https://forum.prusa3d.com/forum/prusa-core-one-assembly-and-first-prints-troubleshooting/filament-sensor-test-failure/#post-776588 Sun, 04 Jan 2026 14:27:00 +0000 Just finished the build of my Core one and running selftests. All work but the side filament sensor test keeps failing. Sensor seems working fine, ik hear/feel it working when inserting a piece of filament, and on the display i can see the sensor going on and off. Also on the side filament sensor status menu i see it toggle between a "NINS/1" (no filament) and a "INS/2" (with filament) message. Seems like the sensor is working but i can only abort the test.

What is wrong?

 

Thanks!

 

]]> Assembly and first prints troubleshooting René https://forum.prusa3d.com/forum/prusa-core-one-assembly-and-first-prints-troubleshooting/filament-sensor-test-failure/#post-776588