Filament sensor 608 bearing
thingiverse
Fits two 608 ball bearings, one is stationary and the other one moves up when filament is between the bearings. Bearing will drop down after filament is no longer present. An endstop can be used on the bearing, I don't know what endstop you use so my design involves gluing the endstop. Endstop should be glues that it is triggered when bearing 2 moves up as filament is inserted. All parts are in 1 STL file, ready to import to slicer and print. No supports needed at all. You will need a rubber band with diameters of about 25mm, four M3*20(they thread into the plastic part), two 608 bearings, and a micro switch endstop along with some glue. I shall soon upload instructions for assembly soon, as I haven't tested it for a long time yet.
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