For my 3D printable "TurnUps" tools,
Download these .stl files: 

JackNut
PotNut
SwitchNut
LED Pop-In Tool
10mm-Scaleable

The 10mm tool is easily scaleable with your slicer to the metric size you need:
- If you need 8mm, scale to 80%.
- If you need 12mm, scale to 120%.
- If you need 14mm, scale to 140%.
I have found that my own printers print slightly smaller than actual size.
So I increase the sizes by 3%, to be slightly larger than the nut:
10mm = 103%, 12mm = 123.6%, 14mm = 144.2% etc.
Your mileage may vary.

For more cool DIY Kits and summer projects,
please visit: www.AustinMics.com