Belt driven Bowden extruder (1:2.5 reduction)

thingiverse

A belt driven Bowden extruder for NEMA 17 motors and GT2 belts.Designed to attach to my Prusa i3 top bracket but should fit any printer with a flat surface about 45 x 30mm that can have screw holes drilled. This unit uses GT2 belts and pulleys for a 1:2.5 reduction. Designed for 1.75mm filament, this has a filament guide and shaped holes for easy filament loading. I used a white tyre paint pen to paint white stripes on the belt every 10 teeth to make it easy to monitor the feed rate etc. Update 25 Oct 2015: v1.03 files replaced by v1.04. The holes for the locating pins on the upper bracket were not deep enough so have corrected. Other parts designed for my printers include: http://www.thingiverse.com/thing:1959901 (GT2 belt clamp (Prusa Y-axis) http://www.thingiverse.com/thing:1937232 (Arduino Mega and RAMPS v1.4 case) http://www.thingiverse.com/thing:1905409 (Prusa i3 steel 10mm upgrade) http://www.thingiverse.com/thing:1959974 (Prusa i3 Steel Y-axis motor mount) http://www.thingiverse.com/thing:1991116 (Prusa i3 Steel X-carriage) http://www.thingiverse.com/thing:1991117 (E3D Chimera / Cyclops mount) http://www.thingiverse.com/thing:1994413 (dual E3D Thermocouple amplifier board - housing) http://www.thingiverse.com/thing:1090661 (Belt driven Bowden extruder with 1:2.5 reduction) http://www.thingiverse.com/thing:896676 (enclosure for SevenSwitch FET) http://www.thingiverse.com/thing:922455 (8mm Z-axis leadscrew bearing holder) http://www.thingiverse.com/thing:922309 (Z-axis NEMA 17 adjustable endstop bracket) http://www.thingiverse.com/thing:899607 (cable chain) https://www.thingiverse.com/thing:2334269 (LCD housing) https://www.thingiverse.com/thing:2377049 (PSU cover) https://www.thingiverse.com/thing:2395715 (Chimera & Zesty Nimble drive cable spacer) https://www.thingiverse.com/thing:2407651 (Chimera Zesty Nimble X-axis set for i3 clone) https://www.thingiverse.com/thing:2436869 (A dummy NEMA 17 motor to hold the 5mm shaft) https://www.thingiverse.com/thing:2748978 (A Duet WiFi housing) https://www.thingiverse.com/thing:2749324 (A layer fan for the Smart Effector) https://www.thingiverse.com/thing:2814068 (A Sannce I21AG mount for 3D printers) https://www.thingiverse.com/thing:2844881 (A cooling duct for a Noctua 40mm fan on a Duet Smart Effector) https://www.thingiverse.com/thing:2846955 (A quiet BerdAir type pump mount) https://www.thingiverse.com/thing:3333609 (A Raspberry Pi case with 40mm fan) For avoidance of doubt, this item is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. See http://creativecommons.org/licenses/by-nc-sa/4.0/ for more details. Print Settings Rafts: Yes Supports: Yes Resolution: 0.2mm Infill: 50% Notes: I printed mine in black PLA, using a brim and support.You may choose not to. I used 50% infill for strength. Bill of Materials There are 3 printed parts: the Upper frame the lower frame the arm Other items required: 16 tooth GT2 pulley 40 tooth GT2 pulley 75 tooth endless GT2 belt 2x bearings 14mm OD, 5mm ID, 5mm thick (for the 40 tooth shaft) 1x bearing 13mm OD, 4mm ID, 5mm thick (for the pressure arm) 1x spring (mine is 7.2mm ID, 9.3mm OD, 22mm long) 1x M4 x 15mm machine screw (for idler bearing) 1x M4 x 45mm machine screw (for the arm pivot) 3x M4 standard nuts Mk.7 extruder drive gear 1x M4 washer (for top of arm pivot) 1x M4x 30mm machine screw (for spring tensioner) 1x M4 nut (for spring tensioning - I turned a piece of aluminium rod and tapped it M4. Attach to machine screw with red Loctite) 4x M3 x 30mm machine screws (to hold NEMA 17) NEMA 17 stepper motor) 1x 1/8 inch threaded Bowden connector (to screw into extruder stationery mount) 1x 5mm steel rod approx. 45mm long (for idler shaft) 3x M3 mounting machine screws - I used 1x 20mm and 2x 45mm (to attach mount to printer frame) Supplier 75 tooth belt http://www.aliexpress.com/item/10pcs-3d-printer-belt-closed-loop-rubber-GT2-timing-belt-150-2GT-6-teeth-75-length/2038039243.html 16 tooth pulley http://www.aliexpress.com/item/GT2-Pulley-16-Teeth-16teeth-Bore-5mm-tooth-Timing-Gear-Alumium-For-GT2-belt-Width-6mm/32301039517.html 40 tooth pulley http://www.aliexpress.com/item/Wholesale-5pcs-lot-40-Teeth-GT2-Timing-Pulleys-Bore-5mm-For-Timing-Belt-Width-6mm-3D/32276844304.html