Filament Alarm Microswitch mount
thingiverse
A simple housing to fit a standard 20mm short-lever microswitch. Comes in two halves so filament does not need to be threaded through it. Switch is mounted with 3 mm or 2-56 screws and nuts. Direction of filament travel should be FROM the lever hinge TO the lever tip to avoid scraping or binding the filament. (see photo; arrows on case are reminders.) Hold halves together with a binder clip. Wire to any dollar-store personal alarm you have lying around. Threw this together in an hour with stuff I already had.
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