Raise3D N2/+ Caster upgrade

This upgrade is meant to be installed on the N2 but I tried it on an N2+ Frame. It's just a bit top-heavy but rolls great on anything but thick carpet. I used the Harbor Freight 3in Casters linked here: https://www.harborfreight.com/3-in-rubber-light-duty-swivel-caster-with-brake-61855.html

All screws and nuts I used come from this kit: https://www.harborfreight.com/725-piece-nut-and-washer-set-with-6-inch-parts-tray-67624.html

The system works by using the threaded mounting holes to mount the bracket which holds the nut for mounting the new casters with a larger form factor for the screw pattern. I am including the "Offset Spacers" I ended up using because I got lazy and did not buy shorter bolts. The screws to attach the mount to the tapped holed on the frame are M5x0.8 with anything longer than 15mm long. I used M5x0.8x30mm because that's what was in the box of screws.

To mount the casters, you will want to get M6x1.0x30mm or so (you could get 20mm but if you can't g