I have made some cable clips aligned in one 4 x 4 matrix.

It is one piece for better build plate adehesion and to make it easy to use a 20 mm wide adhesive double sided tape. After you put a tape please cut pieces with a knife and it is ready to use.

The whole matrix uses a bit more than 1 m of filament (3 g).

The slot is 1,7 mm wide.