Small Geared Extruder with filament runout sensor

thingiverse

Small Geared Extruder for a NEMA 17 Motor Uses Knurled Filament Driver Gear. This Design Also Includes Microswitch Based Filament Runout Sensor Using M5 Pushfit Fittings for Input and Output for the 4mm Bowden Tube. Drive Gear: https://www.ebay.co.uk/itm/322433693693?var=511408080059 Tension Spring; https://www.ebay.co.uk/itm/10-pcs-Leveling-Extruder-Springs-for-Reprap-Prusa-Mendel-3D-Printer-Pop-TH/253300987468?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 Microswitch: https://www.ebay.co.uk/itm/10Pcs-Micro-Roller-Lever-Arm-Open-Close-Limit-Switch-KW12-3-PCB-Microswitch-O3/292334275909?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 Bolts/Fixings Needed: 2 Off M3 x 5mm Flange Head (To Hold Top Cover On) 3 Off M3 x 6mm Cap Head (For Motor) 3 Off M3 x 8mm Cap Head 1 Off M3 x 22mm Cap Head 1 Off M3 x 12mm Cap Head 5 Off M3 Full Nut 1 Off M3 Flat Washer 2 Off M3 x 5 x 5 Brass Thread Inserts 1 Off M4 x 10mm Flange Head 1 Off M4 Full Nut 1 Off M5 x 45mm Hex Head Partially Threaded 1 Off M5 Nyloc Nut 2 Or 3 Off M5 Flat Washer 2 Off 625zz Bearings 1 Off 634zz Bearing This Is a Work in Progress, Need to Write Up Assembly Instructions When All Steps Are Figured Out. Included Mirrored Versions of Main Parts If Want to Print Mirrored Pair of Extruders. UPDATE 18/03/2018: New Idlers That Allow Getting Finger Onto Idler To Open Filament Feed and Slight Spacer for Bearing. New Motor Mount and Spacer for NEMA 17 Motors That Dont Have Flat on Shaft Ground All the Way Along. New Main Body With Relief Cut for 625 Bearings, Outer Bearing Will Not Fit Into Main Body Meaning You Dont Need Top Lid If You Dont Want to Use It.