Simple Parametric Fan Grill

Very simple fan grill, but you can tweak it to whatever size you need.

Standard fan sizes:

| Fan Size | Hole Spacing | Hole Size |
|-|-|-|
| 30mm | 3mm | 3mm |
| 40mm | 4mm | 3mm |
| 50mm | 5mm | 3mm |
| 60mm | 5mm | 3mm |
| 80mm | 4mm | 4mm |
| 92mm | 4.5mm | 4mm |
| 120mm | 7.5mm | 4mm |

Note - these screw hole sizes have only been verified for 30mm, 40mm, and 120mm.