SMSFS mk3 (Smallest Motion Smart Filament Sensor)
Description
Summary Going to long testing, for now working for month 15.4.2022 still looking for right material for springs, PLA get best result, but working for month. I will try next iteration with rubber. 6.4.2022 thing upload resolution < 0.5 - you can use 1mm setting in Marlin FW motion sensor section accurate - can detect missed full step. If you get random filament runouts during print, than: <ul> <li> insert filament and test with screwdriver, that sensor not slipping (i.e. slips only after medium force is aplied) </li> <li>if you get slipping, use different material for body (At the end PLA get best results, PET-G and ABS tends to loose tension in days, for pla it is month)</li> <li>if there is no slipping, you have slipping/missed steps on extruder - they are unnoticable on print, but they are here ...</li> </ul> you will need: <ul> <li> ir pusa filament sensor (without accessories) - i have 0.1 vesion only, let me know, if 0.4 can be fit</li> <li>mk8 extruder drive gear http://www.na3d.eu/p/2421/toothed-feed-wheel-mk8 - but sensor is customizable, any with diameter < 10mm will most likely work after customisation.</li> <li>M3x30(25) screw for axis (+ nylon nut, but works even without it)</li> <li>M3x20 screw + nut</li> Encoder wheel can't be printed in prusa slicer. Use ultimaker cura (engine) for slicing it successfully. You must have perfect first layer for print it succesffuly - you can't use elephant foot compensation - z babystep / z-probe distance setting will be probably necessary. Use transparent filament for first 1-2 layers, than go to black - it will solve elephant foot. I use PLA for it. You can print spacer with anything. Iddler arm comes with 3 versions - original, original with shaft bearing and clone, original is for flat bearing, clone is for v-grove bearing. Print with PET-G or ABS, there is heat from stepper motor. If you have elephant foot, than you will need cleanup motor shaft hole. Must be printed with supports. Print body with PET-G or ABS, PLA is functional, but loose tension on integrated springs in heat and during time. You must cleanup filament hole for PTFE with 4mm drill, check/cleanup place for encoder and drive gear - encoder assembly must rotate freely. Use tongs carefully to free springs (tested with 0.15 and 0.2 layers). If you use supports, you will get better holes on bottom part.
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