J-Struder : 1.75mm Bowden Extruder For NEMA 17 Motor

thingiverse

Update 2019-08-21: Version 4 Guide: Use Collet and Clip to Secure Bowden to Guide, Genuine E3D 4mm Bowden Collet Recommended for 1.75mm Filament, Clones Too Big and Won't Fit. Update 2019-02-02: Version 3 Guides: Enlarged Fitting Hole Radius by 0.1mm for Easier Mounting and to Prevent Cracking, Added Tensioner to Guides to Allow Spring Tension Adjustment, Use 15mm or Stock 20mm Spring, Two Tensioner Lengths Provided. Update 2019-01-27: Version 2 Base: Minor Tweak, Use 8mm M3 Lock Bolt, Added Base with Tube Support. Update 2018-11-04: Version 2 Guides: Improvements to Guides, Minimize Gap to Optimize for Flexible Materials, Use M4 Nut to Secure Bearing. Update 2018-09-14: Version 1: Improvements on the Base (Retraction Stabilizer and Reinforcement) and Guides (More Room for Gear, Plunger, Rounded Edges). This design is inspired by SeeMeCMC EZR Struder, which I used for over a year on my CR-10 until it finally broke. This design is specifically made for the NEMA 17 motor. The head of the knob holds the spring compressed when assembling and feeding or removing filament. Three options are available for the filament feed end: Direct, Fitting, Bowden, Collet. Bearing, M4 lock washer, and spring come from the stock CR-10 extruder. U604zz bearing is available here: https://www.reprap.me/creality-3d-cr-10-extruder-bearing-filament-pulley.html https://www.3dprima.com/parts/spare-parts/creality-3d/a-22668 https://www.spool3d.ca/u604z-bearing Also available on Aliexpress. Alternative bearing is 694zz, 11mm OD x 4mm ID x 4mm thick. Other hardware includes: 2x M3 20mm socket head cap hex bolt (through 3mm plate on CR-10) 2x M3 10mm socket head cap hex bolt (through 3mm plate on CR-10) 1x M3 8mm socket head cap hex bolt (for Version 2 base) 1x M3 6mm socket head cap hex bolt (for Version 1 base) 1x M3 nut 1x M4 10mm 1x M4 nut (for Version 2+ guides) 1x PC4-M6 fitting, 2x when using "Fitting" end Print the base and guide at 0.12mm or higher, requiring proper printer tuning. Use ABS or PETG, PLA works if not enclosed. 100% infill recommended for printing base. Assembly: 1) Insert M3 nut in base and screw in M3 6mm bolt, do not tighten. 2) Screw fittings to guide, push in bowden tube where applicable. 3) Secure bearing with 10mm M4 bolt and lock washer. 4) Slide assembled guide into base. 5) Insert spring. 6) Insert knob head between spring base and guide to compress spring for easy assembly. 7) Attach to motor/printer. Usage: 1) Loosen M3 6mm lock bolt before pressing spring. 2) Press spring and insert knob head between spring base and guide gap. 3) Unload or load filament. 4) After loading filament, remove knob head between spring base and guide. 5) Tighten the M3 6mm lock bolt. https://youtu.be/GqlBTxhC-ZU