Hi Everybody, Just completed by LR3 to LR4 build. Overall not very difficult, except: 1. It took me a while to realize the EMT is larger on the LR4, BOM is clear, but I assumed it was a typo 
2. Controler box - holes much too small for my wires, I was able to keep the standard prints but cut larger holes in the parts, 2. X min belt slot, much too small for my non standard, and less flexible belt, needed some filing of both the aluminum and 3d printed parts, 3. was hard to find 1/4 board for the strut plates, eventually I found some PVC Shiplap in Lowes that was stiff, light and easy to cut with the LR3 before it was dismantled - it is thicker than the recommended size but works great. and 4. I had the ‘unknown command: M420’ error until I upgraded firmware on both the main board and controller to the recommended versions. All in all, a great build experience and the machine is noticeably stiffer and very accurate 
