Fostruder S7 (dual motor extruder)

1.75mm dual Nema 17 extruder design, inspired by [Elliot Foster's design](https://github.com/elliotf/two-motor-extruder), I mostly created out of curiosity but I've used it for a few weeks and it's worked with all the filaments I've tried (PLA, ABS, PC, NinjaFlex, TPU, Nylon). The block has two hinges that can be adjusted with tensioning screws to set the gap between the drive gears.

Motors were connected in series (driven with 24V, 1.3A). Whether you want it hooked up in series or parall