Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4648788.
This is a leg mount for my Rigid ShopVac that I made a two-bucket Thien Baffle dust collection system for (https://www.thingiverse.com/make:724045). I wanted to be able to mount the two-bucket dust collector above the ShopVac so that it takes up less space and move around as one unit.
The leg mounts fit into/over the accessory mounts on the Rigid ShopVac casters. I made it to accept a 2x2 post (1.5"x1.5"). I purposely made it a little tight so the 2x2 can be shaved to a snug fit.
I made this first using SketchUp, which honestly was a bit of a pain due to some curved faces. Sketchup also mangled the stl file, so I used an online fixer. The Sketchup stl is what I printed.
As a exercise, I remade the part using CaqQuery (https://github.com/CadQuery/cadquery). I haven't tried to print this, but it should be easier to adjust if someone needs different size.