Filament Sensor with Microswitch

This is a very simple filament end switch using a common microswitch and a small ball bearing for low friction operation.

BoM

- 2x PTFE couplers for 4mm pipes with M10 thread - micro switch with roller lever - ball bearing 4mm x 9mm x 4mm (skateboard style) - 1x M4x8 screw and nut (for mounting the ball bearing) - 2x M2x12 + washer + nut (for mounting the micro switch) - 4x M3 threaded insets - 4x M3x8 for mounting the cover to the base - Optional: 3-pin JST socket Printing

No specific settings required to print this model.

Assembly

- Hot insert the insets into the base - Press the M3 nut into the groove at the bottom and screw in the ball bearing - Solder the JST socket to the micro switch pins according to your preference (triggered closed or open- needs to be set properly in the firmware). - Mount the micro switch using the M2 screws. Adjust the angle so that the filament triggers the switch when inserted - screw in the PTFE couplers (make sure they fit in straight) - The connector can be glued into place for a more firm fit - Screw the cover on the base tp close the case