I usually just freehand them...that seems to work well without this tool

Cool, this would be great for whenever I'm putting inserts in parts with thin walls. Adding this to my print queue

I also free hand. Every once in a while I wish they were more perfectly square, but then I realize I don't actually care enough to print a fixture and have to deal with attaching/detaching my Weller.

I just use tweezers and a blue flame lighter. Heat it for 5 seconds then put it in the plastic. Then use the back of the tweezers as a flat surface to push it all the way in and level it.

This worked well so far and I really don't see the need for a special soldering iron bit or a press like this.