Adapter to fit 20mm thread dies to 25mm threading wrench. Prints easily enough, no supports required. I printed it in PLA with .2mm layer height, 50% infill. Probably needs a lot of infill, since the walls take compression forces. 

Fit is quite good, as I can't get my ¼-20 die out of the adapter anymore* :D The adapter best fits 7mm thick dies and 9mm thick wrench (centers the “punchmark” in die to wrench), see cross section/sketch for more info.

* Quite nice actually, as I only have a few 20mm dies so I can make one for each.