Our camping cots are still in good shape, but the feet covers were splitting and falling apart. Instead of risking them puncturing our tent floors or damaging a cabin floor, I made some measurements and quickly made up a replacement in TinkerCAD.
The OD of the cot legs measured to 25MM roughly on both cots, and the feet look identical to replacements sold under a number of brands/retailers.
I will be field testing this over the upcoming weekend, and make additional tweaks if needed. Currently they fit very snugly on our cots.
The author marked this model as their own original creation.