fan guard - 60mm

- Very simple finger protector for a 6020 fan i have bouncing around my workspace.
- Tight fit. Should be a perfect fit with no additional space. So if you push a or smaller width (like 6010) into it you may need to destroy the print to get the fan out again.
- This item is particularly useful for high speed, high static pressure fans; where the first time you stick anything into the spinning blades will almost always be the last time.
- As always; assumes a 0.4mm nozzle. Layer height is fairly irrelevant, but I used 0.3mm