I just want to run a squre

Hey guys
Those days i have made a single arm scara 3D printer but i met some problems when i tune the machine.When i send a order to make it draw a square while the machine draw a parallelogram.
I know there are something wrong in my firmware(the firmware vitaminrad released in GitHub).Could you please help me out. Which parameter shoulde i modify????? Thank you!!!!

Edited 1 time(s). Last edit at 03/13/2017 11:21PM by ddyan.

A bit more info would be usefull, like some details of the construction etc.

But by that work of art xD i would suggest some possible reasons
One would be one or both motors skips steps, or they are not "in tune" with eachother, or, one does not meet the torque requirements or the gear ratios / steps / unit are not well defined etc.

There could also be mechanical problems.

A quick snap of your configuration would not hurt, to see your current parameters and such

You can try wangsamas firmware
Download at [github.com]
Hardware configuration can view here
[www.wangsamas.com]

Hi alex.me
I think i have found the problem but i don't know how to solve it . I think the problem is the firmware parameters is not correct in my printer.

When i modify those two parameters the graphic will change.
,

Edited 1 time(s). Last edit at 03/29/2017 02:19AM by ddyan.