Selectron, modular extruder and multi-filament selector (not mixing)

thingiverse

Read always updates at BOP latest 02/15/2020. After SelefaXt I thought of using geared micro motors to actuate color changes. Only one Nema17 is required. Fewer items need to be printed and assembled. It's easy to manage via firmware. This setup produces less noise. Here is my Selectron design. In this release, three filaments are included but it can easily be expanded to four or more, or shrunk down to two filaments with the supplied items. Cheap Chinese 6/12V geared micro motors have been implemented to switch from one color to another, producing a force of 20N and low current consumption. This allows for full control over filament pressure by adjusting cursor stroke via software and refining it with its antagonist screw. The extruder shaft coupler is now a cheap 5mm teeth idler. I tried to keep the design as small as possible (about 130x130mm) while making it printable without difficulty, and ensuring it's visually pleasing. It can be mounted in any convenient position but I advise mounting it horizontally to let the filament dust drain holes do their job. A first functional test is available on YouTube. For those interested, the entire project can be found on Tinkercad by searching for "Selectron". Any help, particularly regarding managing Selectron from Marlin, will be greatly appreciated.