Flurin, blah_59,
Thank you guys for your help!! I am now able to use the axis min to set the home of the printer. All is now left to do is calibrate the extruder. is there a default setting for seemecnc extruder and a j-head hotend?
I found this while looking around for a solution.
http://reprap.org/wiki/Triffid_Hunter's_Calibration_GuideA tool to precisely measure 100mm. A vernier caliper is ideal.
A tool to precisely measure something 0.5mm wide. A micrometer is ideal, but a vernier caliper will do.
Know your stepper motors' full steps per revolution value. steps = 360 / angle, so 1.8° = 200 steps, 0.9° = 400 steps, etc.
Know your stepper drivers' microsteps setting. Most Pololus are set to 16x. GEN3 driver 2.3 is fixed to 2 (half step). Some boards have 32x.
Know the number of teeth on your pulleys. Standard printed pulleys have 8 teeth. Most machined pulleys have 10 or 12 teeth since 8 tooth is technically too small for T5 belt
Know your belt pitch! XL and T5 belts /look/ the same, but the difference is important!
Know the number of teeth on your extruder gears, or at least the gear ratio.
Remove all sources of backlash. Your parts won't be usable as calibration pieces if you have lash!