This is a simple design to test whether your part is actually accurate or not especially on the circular part.

This design can help you if you only need to change horizontal expansion either the usual one or horizontal hole expansion, or if you actually need to change steps/mm on your machine

Dimension: 55mm x 25mm x 8mm with 10mm, 15mm, and 20mm hole

It only cost 5g of filament with 0.2mm layer height and 15% infill, but you can reduce it if you want