Fan Holes (Negative Cutout) for 40mm, 60mm Fans

Sometimes you just need to slap a fan onto something.
Add this as a negative volume to your object (in your slicer, or as a boolean in your CAD software) to create a cutout for a 40mm or 60mm fan. Template object is 1mm tall; scale the z-axis to pass through your object.

Dimensions:

• 40mm: mounting holes 3.4mm (M3 screw), spaced 32mm apart. Center hole diameter 39mm.
• 60mm: mounting holes 3.4mm (M3 screw), spaced 50mm apart. Center hole diameter 58mm.