I don’t know if I can ever achieve a high level of accuracy/precision with this setup. It’s very experimental.
As it depends upon keeping the sled vertical, the lengths of the bottom two motor wires are just as critical as the top two. I had bought an MEMS orientation sensor to hookup and was thinking about writing code that would adjust the position of the bottom motors such that the orientation remained vertical. But as I dug into it more, I found that the accuracy of these things was actually pretty poor in a dynamic environment… +/- 2 to 4 degrees… that’s a lot of error for a quadrilateral arrangement. Fine for a drone maybe, but not so for Maslow. I’m hoping just calculating the wire lengths work better. If all fails, I can do an arrangement like Maslow Mark II and mechanically constrain it to be vertical.