As part of a home brewery project, I needed to mount a piece of Unistrut to a vertical leg of a stainless steel work table. This mount bolts onto a piece of Unistrut and then clamps onto a 41mm leg of a Regency worktable (https://www.webstaurantstore.com/equip-stand-24x72-galv/600ES2472G.html).

At the request of another user, I've also added a version for a 1.5 inch diameter pole.

Finally, I created a version with just a 10mm center. You can import this version into Tinkercad and create a cylinder hole of whatever diameter you like and drag so it is concentric with the 10mm hole; then group the two objects.

Creality

Ender 3 Pro

No

Yes

Dynamic

30%

I printed both pieces at the same time in the oriented as is in the STL file.