Rubber Feet for Anything

I am making a chamber for my RepRap and wanted to put it on Rubber Feet. They were expensive at the hardware store ($6.00 each) so I purchased a pack of 4 rubber tips and made some inserts to go in them. Total price $2.19 for the feet and 49 cents for the carriage bolts and nuts.

Parts List

4 1/4 in. Carriage Bolts of the length you need
4 Nuts to fit
4 Slip on rubber feet like the ones pictured