X-Y calibration on Geeetech i3 C (acrylic)

[e415ldc]

I am pretty new to the 3D printing arena. I am trying to print some pulleys and gears for prototyping robotics parts. I have a Geeetech i3 Pro C acrylic printer.

The issue I am having is in the X-Y calibration. The diameters of the gears and pulleys are not correct (too small). If I use the "xy size compensation" in Slic3r it can correct the holes but not the outside diameters of the gears.

I think I need to re-calibrate the X-Y step counts in firmware. Where can I find those settings and also what is the step count/step angle of the motors included in the kit? Is the printer using 1/2 stepping, 1/4 stepping etc? The Slic3r web site has a calculator but I need info to use it like steps/mm (thus the question on steps per revolution and/or angle. I also then need to know which variables to adjust in the firmware.

Thank you for any help.

[bang]

The step for the motor is 1/16 step,concerning modifying the firmware you can refer to this:
http://solidutopia.com/marlin-firmware- ... ide-basic/
And first download the firmware for your ProC from here:
viewtopic.php?f=20&t=17046

[e415ldc]

Thank you for the links.

I had figured out which variables I needed to change in my own, but I am confused as to why I needed to change them and why they were not documented in the user's manual the way the direction changes are.

The value for both x and y in the firmware file are 78.174. The calculator returns a value of 80. But, I needed to input a value of 83 to get the x and y dimensions correct. This is very odd if the other info is correct.

I am now attempting to get the 3D touch working. It is requiring some tweaking as well. An explanation of what the variables do that are being changed via the instructions in the manual would be helpful to the customers.