Looked at various GT2560 mounts but none were what I wanted or didn't fit my requirements, so designed this one based on ideas from various out there.
I use this to mount my GT2560 board behind a back panel of a lack enclosure for my 3D printer.
I wanted to make sure the mounting screws for the holder were not near the GT2560 board.
Wanted the ability to mount a larger cooling fan the the dinky 40mm fan that came with my 3D printer, so this has a 80mm space on the top.
Most mounting holes are M2, except the ones that mount to whatever you're attaching this to, which would fit M3 with a washer or M4.
Use standoffs to get the right height between the fan and your GT2560 board.