1.75mm 28BYJ-48 Universal Bowden Extruder 1.75/3mm filament v.1

thingiverse

This is a universal bowden extruder, designed to work seamlessly with both 1.75 and 3mm filament despite its versatility, I've only personally tested it on 1.75mm filament. I have limited experience with this extruder as I built it for my custom 3D printer, which utilizes the robust 28BYJ-48 stepper motors, so far, I haven't pushed the limits beyond 15mm/second at 0.2mm layer height. Based on its design, I suspect that it may not be able to handle speeds above 30mm/second at 0.2mm layer heights. (I apologize for the low-quality picture; it's late at night, but I promise to post better images and a video of it in action soon.) Print Settings: Printer Brand: RepRap Printer: Sunhokey i3 Rafts: No Supports: No Resolution: 0.2mm Infill: 35% Custom Section: Materials: 28BYJ-48 Stepper Motor 5mm drive gear (I used this product from Amazon: https://www.amazon.com/gp/product/B0107KNVY4/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1) 8x22x7 ball bearing (make sure to get one with an 8mm ID and 7-8mm height, available on AliExpress: http://www.aliexpress.com/item/Different-Price-10-Pcs-Lot-8-x-22-x-7mm-Metal-Sealed-Shielded-Deep-Groove-Ball/32623835808.html) Small 8mm or 5/16in rod Rubber bands 2x tube connectors (available on AliExpress: http://www.aliexpress.com/item/Wholesale-5pcs-lot-3D-printer-HOTEND-j-head-e3d-remote-hot-head-Connector-extruder-feed-3mm/32240250889.html) From my experience, you may want to consider using a larger drive gear as these motors have considerable torque and could benefit from increased speed. There's plenty of space for a bigger one if you can find it. Instructions: Note: Before attempting this project, you must modify the motors to be bipolar (follow these instructions: http://www.electronicsmayhem.com/?p=13). Attach drive gear to stepper motor Place stepper motor in place, ensuring the pegs fit inside the metal holes Snap the two pieces together Slide the ball bearing into the opening Insert the 8mm rod through the bearing Attach rubber bands to the rod, applying tension on the drive gear Screw in brass Teflon tube fittings (they should fit well inside) at either end of the extruder (you can get away with one, but you risk the filament going astray) Load the filament and you're ready to go!