Hi all,
I have been experimenting on making the extruder parts, and since I do not have a lathe, I tried several things to make the drive screw [
www.reprap.org] And I found that when putting the screw in a drill (which has been fixated to my "workbench") and using a dremel like tool with either a cutting disk or grinding bit, this can actually also be done rather well. Set the drill on low(est) speed and rotating in the opposite direction of the dremel, then use the dremel tool to carefully remove the material where needed. This does not give you a fantastic result, but it might do the trick.
Do wear some safety goggles - I had some bits and pieces of disk flying around...
Joost