Chain motors spin at different speeds during Y axis movement

[dicoy]

Here’s a better picture of the wedge:

Now I’m dealing with this issue here, cause I ripped the nail out again due to the chain being too short (I posted some more pictures there if you want to see):

Calibration trouble!

I would reassemble the chain and then extend it manually and see what exactly is binding up as you get to the bottom corner. is the slack end of the chain too far from the motor? does the slack chain management catch on something? some other problem? by moving manually (in smaller moves) you can se as things are getting close to being in trouble rather than havng things break. David Lang