UPDATE: I have currently halted work on this project. I was able to get pretty good results, but after some thought, I'm not sure the large amount of waste generated from the extensive purging that is required for using only one hotend and the very long print times are worth it. It is a very cool idea and I may continue work on it at some point, but for now, I am letting it rest.
You can check out the printer I am developing on our website
This filament loader is designed to autoload 3 different materials into a direct drive extruder. The design is modular, so in theory, you can add as many filament bays as you want.
This is designed specifically to work with the Duet 2 control boards and I will be working on and publishing firmware for Duet.
Please note that this filament feeder will NOT work with a geared direct drive extruder. Your hobbed gear must be directly mounted to the motor shaft on your extruder.
You can find the Fusion 360 files in the file section.
People have been asking for a rough BOM. I think I have everything here. Please let me know if you have any questions. The NEMA 17 with 100mm shaft we had to have custom made. We will be selling them on our website soon if you cannot find that part.
-2x 8mm round rod at 110mm
-2x Igus Drylin RJM-01 8mm
-4x 10mm OD bearings with a 3mm bore
-1x 10mm OD bearing with a 5mm bore
-1x NEMA 17 with 100mm integrated lead screw available from Hydra Research https://www.hydraresearch3d.com/parts/qmpid8sbp277kcd25a9wrngcqywaqr-j3j2n
-1x NEMA 17 with 100mm shaft
-3x M6x100m bolts
-2x M2x14 bolts
-2x M2x5 bolts
-3x M6 threaded heat set inserts
-2x M2 threaded heat set inserts
-1x 3mm rod at 100mm
-3x E3D 1.75mm Hobb Goblins
-Assortment of M3 bolts
-0.5in compression spring https://www.mcmaster.com/9657k268
-0.25 compression spring https://www.mcmaster.com/9657k258
-4mmOD 2mm ID PTFE
-4mm D 3mm ID PTFE