3G 5D Mini
With this add-on board, your original MakerBot Cupcake can drive an additional stepper motor.
What on earth will you do with an additional stepper motor? Drive a stepper extruder, of course!
Stepper extruders can precisely control the flow of plastic, and can stop plastic from flowing between printed bits — an obvious thing in hindsight, and it’s amazing we’ve gotten this far without it!
My design is inspired by Rob Giseburt’s 3G 5D Shield, and is completely compatible with it — you don’t have to compile your own firmware, because the firmware is already available through ReplicatorG.
Building the Mini requires basic surface-mount soldering skills — but the surface mount parts are huge, so don’t let that scare you. Head over to the 3G5D Mini Thingiverse page to build your own!