Combs are in the original "click" system. Randomly tested sizes: 1mm, 2.5mm, 4mm, 5.5mm, 7mm, and 8mm – each one fit my razor.

I don't recommend printing multiple at once. Print one first and check if it fits. Printed on a problematic Ender 3.

When removing, hold the plastic part of the blade as shown on GIF. Failing to do so may result in bent blades.

Any feedback is welcome!

Printed with a 0.4mm nozzle and a 0.12mm layer height.
Supports depend on your printer. On the Ender 3, I created a small support (about 5mm wide) in the center of the bridge.
Overly dense supports may cause damage to the print.