i3 Mega Micro Filament Sensor
thingiverse
11/11/17: The cap is now fitted tighter. 11/29/17: A switch space has been tightened, and the arm lengthened. This visual copy is a direct replica. I believe the original uses a miniature snap action roller, while this version employs a sub-miniature (13x5x10mm) like the one found in the i3 Mega sensor's original design. Below is where it was ordered from: a three-pin switch with one normally open and one normally closed contact. The connector has been removed, pins bent up at the board level, and soldered directly to the switch (S and G are connected, V not included). The bearing turned out to be broken and non-functional, likely due to a problem when PTFE tubes used as size adapters were dropped on the filament. https://www.ebay.com/itm/3-Pin-1NO-1NC-Subminiature-Micro-Switch-W-Lever-Roller-5pcs-S7P7/172667598181?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649
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