Three different hole sizes: 
- 9.7 mm for typical pens
- 7.7 mm for pencils
- 11.2 mm for sharpies

Use 6 x 3 magnet if you want to have it on a fridge or something.

Print Orientation: Flat on the bottom surface for best strength

Material: Whatever you want

Layer Height: 0.2mm

Infill: 20–40%

Supports: I used tree support and it worked great