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Hi,
Don't worry. Your question are appreciated as with such good feedback I will learn a lot too.
Now this is a bit more complicated. What speed you set in software you use to control the printer and what are the values you set in firmware?
My working values are around 4mm/s (240mm/min) for maximal extrusion speed and 17mm/s^2 for acceleration and retraction. With 1/16 microstepping I have 7026.994 microsteps/mm on extruder. You will probably have slightly different number as my hobbed bolt diameter is around 6mm. With shallower groove it may closer to 6000 microsteps/mm.

Also check my conversation with Eddiie: http://www.thingiverse.com/thing:945156/#comment-1191875, where are some more things explained. (you will have to copy paste the link)

ToyREP 3D Printer
by thorgal