I got my machine to make a couple of prints last night - I still can't believe I was able to get the settings roughed in well enough to make usable prints this quickly. I made a simple 10mm thick calibration plate with holes to test out the various functions. Right now I have my e_steps_per_unit = 250 in the firmware. I think this is probably a bit high, but am not really sure what other Makergear plastruders are set to. With it set to 250, it takes six clicks of extrude to push 10mm of filament into the extruder. So that should be 250*6/10 = 150 to reach the appropriate value. I'll try that later today and see how it works. I'm kind of confused at the length slider in repsnapper - does 10 mean it will push 10 mm into the extruder, or 10 mm is supposed to come out of the nozzle?
For skeinforge speed I used feedrate=20, flowrate=180