Simple Size Test

Suspected my printer not working to correct size. So I've decided to create a basic but quick to print size test. It measures just 20mm long, 10mm wide and 10mm high. Also has a 6mm square hole. This makes it rather easy and fast to check your printer.
- Please note: Measurements been taken on drawing after design. Design values are in fact exact 10,20 and 6mm values. -