Hi all, managed to upgrade my custom OX build to use a rack & pinion transmission. The accuracy improved A LOT compared to the old GT3 belt drive. Only one issue still exists, and I can't figure out the root cause. I squared the X & Y -axes with the 30/40/50 method, like described here: I got the axes squared nicely and added hard stops to both X-axis profiles so it's easy to make sure it's straight every time I start the machine. But when I power off the machine, the other gantry moves around 2-3 centimeters. So there's some kind of tension in the frame but I can't figure out which part of the machine I need to adjust to make it stay as square as possible even when it's "relaxed". I adjusted the machine by moving the rack connected to the other side, so the adjustment moved the whole gantry. But I can't figure out any other way to find as much movement I needed to make it square.
