Build issue - string holes clogging

So I have this issue, that after applying paint and lacquer the holes get clogged, or they just get clogged from print artifacts, and its impossible to insert strings. Drilling didn’t help because the drill enters the print infill space and threading a string just won’t work.
Jax 6 string violin.

Managed to solve the issue with a drill press and a 3mm drill. However the holes are not rounded like in the original design. But its much more easy to insert, will test if it still works.