Got the X and Y axis done. Now working on the extruder head.
Well, according to the instructions I've got the Y axis done, but it sill haven't mounted the motor for it so I'm not sure if I'd count that one complete.
As for the extruder head, it's actually quite a simple little thing. There's a brick of steel with resistors bolted to it. The plastic wire feeds in through an insulated channel till it hits the extruder head at the very end and melts. (Or at least that's how it appears to work, given I've never seen it do so.)
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