created this design to mount a BIQU SKR 1.1 board to my AM8 / 2020 / 2040 printer.
it also fits the MKS GEN-L and the newly released SKR 1.3 board
hole distance = 101.85 x 76.10mm
mount the board with 4pcs M3x16mm screws and M3 nuts.
extrusion mounting holes are 6mm wide and 5mm deep for M5 screws (x8 or x10mm)
the spacers for the board are a bit high, but that serves the purpose of putting and maybe even fixing many of the longer cables behind the board, so the top side gets a bit tidier. :)
if you are currently planning your build I can highly recommend to give the very silent TMC2208 stepper drivers a try! (see the table below how I use them in my printers)
Update 28.03.2019: V5 replaces the inner middle screw hole with a slot to put the T-nut through for easier mounting