Now i’m just trying to tune in my new sled and it seems a little harder than it was with a stock unit. My original maslow build was around 1mm off on the center square test. My upgrade is now a little less reliable.
It looks like you’ve got some kind of plastic on the surface of the sled to reduce friction, so that suggestion is a non-starter.
Because your z-axis allows you to raise the router a lot, and removes obstructions that a normal base presents, you could chuck up a v-tip bit and raise its tip to the plane of the chains. That way you could measure to validate that in fact the tip is always the same distance from both chains. It will take some thinking about how to best make the measurement, but it would help answer whether the issue is hardware or software.
