Summary

Inspired by https://www.thingiverse.com/thing:1790545, but a new design as I had a bedframe with much larger caster wheels.
The wheel slots are sized for a 1.92" diameter and 1.65" width caster wheel. My bed that I built this for was also on a slant so I integrated optional lifter attachments that mate into features on the bottom to adjust the height while locking in place. Provided is a 1/4 inch thick lifter.