A wheelnut on my old laundry cart fell off, somewhere between the clothes line and the back door. A short search failed to find it.

I soon realised I could design and print one quicker than searching.

This is a simple cylinder, with a 5mm hole to fit the axle of the cart.  A bit of persuasion with a hammer got it on.

The design was done in Orca slicer, no CAD required.

Printed in PLA, it needs two grams of filament and printed in five minutes on a BBL A1.