Printrbot notes
Flashing the Printrbot: This would allow some fine tuning calibration like the extruder, but is more intermediate/ advanced technique. dfu-programmer is suggested here for flashing to the printer. Alternatively, one could use the arduino environment described in below link.
here’s some basics on Flashing.. I’m still not sure how to edit. I think you download a new firmware, edit it, then flash it to completely overwrite the existing firmware.