Summary

Threaded leveling foot modeled to fit 1/4" hex head bolts. The leveling foot pad model allows you to but the bolt's hex head on the top of the mounting foot and glue it into place. If printed it TPU this can help with vibration dampening for machines. The leveling foot pad thru model was made to have a 1/4" bolt mount through from the bottom. I wouldn't recommend using this one, but it's there as an option if anyone would need it. Use a 1/4" jam nut to level your machine.

Here's the McMasterCarr description of a similar design, "The rubber base reduces vibration to protect components and extend your machine's life. The base also cuts down on noise, protects floors from scrapes and gouges, and grips surfaces so vibrating equipment doesn't slide. Install these mounts in threaded holes to level equipment on uneven floors. Use a locknut to install mounts in unthreaded through holes."