NEMA17 Bowden Extruder M6 1.75mm

thingiverse

UPDATE JUL.22.2018: I made a DIRECT variant of the original beltless design for 1.75mm filament. The heatsink mount is a bit tight, so I'll forego the clamp for now, but I'll fix this in the final revision. It requires 4 x 25mm M3 screws, L-bracket, 4mm OD bowden tube running down the length of the heatsink. I guess the clamps will need 2 x 10mm M3's. The original (light blue) design is still running problem-free but I'm going to try some direct extrusion since I'm using a moving XY plane/bed and a stationary hot end. UPDATE JUL.19.2018: I'm just finishing designing the belted variant of the sliding tension block extruder. The picture does not show the 60T pulley or the 5mm drive shaft. This is one of my last projects for countersynchronized FDM printing since I just use it the way it is, but really it *should* have some mounting holes to attach to a frame. Known Problems: --threading the 1.75mm filament is a challenge if its tightly wound (end of the spool) --no practical application since i just use it the way it is Here's what you'll need: 1) NEMA 17 Stepper Motor 2) 11mm MK7 Drive Gear 3) U604ZZ (604UU) Grooved Bearing (13mm OD, 4mm Height, 4mm ID) 4) M4 x 10mm Screw to secure the Grooved Bearing 5) 4 x M3 x 20mm Screw to attach Extruder to Stepper Motor 6) M4 x 25mm HEX Bolt to attach the Tension Block to the Extruder 7) M4 Flat Washer (between spring/extruder, and above/below U-Groove Bearing) 8) Spring (mine is about 8.2mm OD and 10mm Length) 9) M4 Wingnut to adjust Tension Block Printed Parts: Extruder and Tension Block Tools: Screwdriver, Drill, M4 and M6 Tap, File/Sandpaper (optional--to clean up the printed parts) INSTRUCTIONS: -- print both parts (extruder and tension block) -- clean up both parts: drill through 4 x M3 holes w/ 3mm or 1/8 bit, drill through M4 Hex Bolt w/ 4mm or slightly larger non-metric bit. Drill down through tension block using 3.3mm bit or 1/8" (~3.10mm) also drill through any other holes to make em nice and round -- tap M4 on tension block and M6 on extruder after drilling through w/ the right bit -- assemble everything as shown BEFORE mounting it onto the stepper motor I printed w/o supports. Your printer should be able to print ~1.8cm bridges on the tension block.