To anyone who cuts their own hair and keeps it shorter than a few millimeters, I can strongly recommend the Remington “indestructible” HC5880 hair trimmer. The “indestructible” attribute only applies to the trimmer itself, not the plastic combs that come with it – both the 3mm and 6mm version broke after less than 3 years of use. A replacement set (SP-HC6880) costs around 20€ and includes mostly parts that I don't need, so I designed my own in OnShape. It fits quite well, and was tested successfully.
Printed on a creality ender 3 V2 with a 6 mm nozzle using supports, making sure the flat part of the comb goes against the print bed. I used a slightly modified version of the default preset with elephant's foot compensation disabled for better adherence of thin parts, and raised the number of perimeters in order to get 100% infill.
The author marked this model as their own original creation.