E3D Revo nozzle holder

There are two holes in the rear to accommodate round magnets measuring 19mm (diameter) by 5mm (thickness). I purchased these magnets from Daiso.

It is recommended to print this with the rear lying flat on the print bed (text facing upwards).

If printed with 0.2mm layer height you can add a M600 filament change at layer 141 to print the nozzle size text in a different color.