Here's a stand to hold your soldering iron on a dremel workstation drill press.
You can then insert threaded inserts into your 3D printed parts.

I had found some designs online, but they were flawed. So I decided to create my own.

I supply the Fusion360 file.
The design is parametric, with the possibility of entering the diameter of your soldering iron.

My soldering iron is 17 - 18 mm in diameter, and I supply the corresponding STL.

No support needed.