Filament Runout Sensor V2 - for Makerbot/RepRap/Geetech mechanical endstop

thingiverse

Smaller Filament Runout Sensor - Revisited This version features a direct button, no lever on the microswitch, and connects directly to the extruder, making it impossible to forget. - 2018-04-07--12-33-40 I've encountered poorly wound filament that is intermittently wiggly, causing misreading of the runout sensor. Due to this issue, I've discontinued using this sensor and will refer back to my previous version for now. Normally, if your filament is properly wound, it should work fine; however, if your filament has highly irregular diameter or straightness, it may fail. - 2018-04-04--13-29-10 I replaced the file and fixed the button not pressing issue. You can print this: filamentRunoutSensor-003-PRINT-ORIENTATION.stl. Assembled form for reference is filamentRunoutSensor-003.stl. - Why: It bothered me that I kept forgetting to put the sensor back on after a filament change, so I made it attach to the extruder. - Also: 2 - M3x12 screws through and into nuts. 1x M3x50 secures the sensor assembly to the extruder. Optional. No doubt I will countersink everything in an updated version once I get some of the right bolts. Also, houses 2x 6x1.75mm round magnets. These are essentially useless if you screw it into the extruder and really useful if you don't and your extruder has something ferrous the sensor can stick to. - Works for me: PLA, 0.12mm layers, 0.4mm nozzle, 0.8mm perimeter, 10% infill, support (for the teensy extruder feeding protrusion) - NOTE: I print with a 0.4mm nozzle so I specify 0.4mm external perimeter width in Slic3r. TO ALL OF MY MODELS TO DATE. Typically a 0.4mm nozzle prints its external perimeters at 0.45 to 0.48mm by default, so unless you instead specify 0.4 you will probably find mated parts are too tight and bolt holes do not fit bolts. Specify 0.4mm external perimeter and you should get the results I do: perfect fit. - Why do I do this? Because it makes the math and modeling easier and more precise than needing to add 0.45 to 0.48...divided by two (0.225 to 0.24) to everything....0.4 divided by 2 is 0.2...and easier.