Test Stick

thingiverse

Yes, it's just a stick that measures 5mm by 5mm by 100mm; not exactly known for its strength. If you're feeling lazy like me, you can simply download it - I managed to create it in Fusion 360 in about three seconds. I had some issues with my Ender 3 printer, and the print started to separate badly as the layers increased, but using this fix worked wonders: a simple tightening of the screws, wheels, and bolts did the trick! Hope this helps you out too.