The hot end of the extruder is working. I can successfully melt ABS (thanks Neil!), I still need to make something to push the filament through it. I'm using old-school MakerBot technology right now: a Mk3 heater barrel, nozzle and thermal barrier. The heater is driven by their PWM board and temperature monitored by their thermistor board. All this was bought a couple of years ago, so it’s now a couple of generations old :-)
My test sketch in my Arduino uses the PID library to keep the temperature constant. Once the temperature was stable I pushed some 1.75mm filament in, and eventually I got some ~0.5mm coming out the bottom. It took quite a bit of force, but it did work. Next step: the extruder motor.
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