If you want to use inserts for threads, the wall thickness usually needs to be much thicker than standard (2 passes). Is there any option to change the wall thickness only locally (for holes) rather than globally?
For the very slight difference in time and amount of filament used, you’re better off just increasing the amount of walls to 3 or 4, which is enough for inserts. The bonus is your whole print will be much stronger.
Good advice, however the cylinders don’t snap to the existing holes (they should really), making aligning them hard work.
My advice is to actually model them into the design as separate wall cylinder bodies, when you export you’ll have the main body and all the hole walls as additional bodies, simply select all these hole bodies and set the wall to some large value (the slicer wont add walls beyond the boundaries of the body).
This worked for me.
I’d like to see holes identified by the slicer in future and ‘hole walls’ be a settable feature. Here’s hoping.