I recommend printing the insert/holder out of TPU for a snug hold. The shell is printed from ABS, but anything will do. I included two holes for 15mm x 2mm magnets, which can be glued into place. This should work with any nozzle that has a 7mm hexagonal shape. I printed the parts relatively fast, so your results may vary.

All dimensions are exact, so slice accordingly. If using TPU, I recommend 10% gyroidal infill with support for the top face, 1 wall, and at least 3 top layers for a proper top face.