I recently assembled the kit from Marty. This kit includes the rack and pinion for bed leveling.
I have adjusted the printer (including z offset) so that when the hot end is in the front left corner (X20 Y16 Z0) I can just barely fit a sheet of paper between the nozzle and the bed. I get a really nice first layer when printing a 20 x 20 calibration cube (I configured the slicer to only print the first layer). As I move the hot end over to the front right corner I can see the gap between the nozzle and bed increase. When the hot end is in the front right corner (X180 Y16 Z0) the gap is so big I can fit 4 sheets of paper between the nozzle and bed. Printing that same first layer of the calibration cube in this location does not turn out well at all.
I ran G28 and G29 before moving the hot end around and measuring the gaps. I’ve done this with the bed code and heated to 60C. I run G28 and G29 within the start script of each print. The results are the same - the gap is greater on the right side of the bed.
I verified the left and right ends of the X carriage are even and that the gap between the MDF board and the bottom of the bed are even, both with a micrometer.
I would like to print some large objects that take up nearly the full width of the bed, so I need to get this leveling issue resolved.
Any ideas on what I’m missing here?