Been looking for a printable motherboard tray and not found one, so found some standoffs on thingiverse https://www.thingiverse.com/thing:460319 and a few other which either were too big or too wide or too thin on the top, making them very easy to break (may be different for ABS but I print in PLA). These seem to work perfectly and are not huge or fragile.
Made with tinkercad
12.95mm Base Height , 3.81mm Tip height 4mm Tip width
Printer Brand:
Wanhao
Printer:
Wanhao Duplicator i3 V2
Rafts:
No
Supports:
Doesn't Matter
Resolution:
0.2
Infill:
50
Notes:
Made with tinkercad