And another tiny #3dPrinting item that can easily save valuable gear from tumbling. It prevents IVAR shelfs from tilting up.

IKEA IVAR shelf safety locking peg (no screws needed)

https://www.printables.com/model/1639271-ikea-ivar-shelf-safety-locking-peg-no-screws-neede

A set of four, one for each corner of your shelf, prints in under an hour. 3g each. No tools needed for mounting.

Place the block, click in a normal #IKEA #IVAR metal pin. Slide it in. Done.

Despite using very little material, it’s very strong, due to hidden inner geometry that bears load.