Hi. The poor Dog :) Love the machine. One comment I would make is that my gantry is aluminium plate (effectively 15mm plate in box configuration) with 20mm alu side plates and I couldnt find any play from one side (X) to the other (from a racking perspective). Once the screws were connected and the motors turned, the machine was well able to rack itself. I'm actually looking forward to the independant homing of the X axis proximity switches, as Jazz noted to me before, the bullet type allow adjustment; I'm banking on this to help me get the gantry square as its being set up. Even though your machine is steel, I suspect it can rack and be adjusted.. just a little.