When I was in school, I needed a compass, so I decided to make one myself. This compass is simple in design, practical in function, and can perfectly fit most pencils.

Required materials:

• 3 M3 small bolts
• 1 M3 nut
• 1 small washer
• 1 M3 butterfly nut
• A small piece of rubber - used to create friction between two pieces of plastic.