Find optimal hole size for thread forming screws in plastic

[melanielaporte]

Is your feature request related to a problem? Please describe.
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Our enclosure needs to be held together with screws and we do not know enough to choose the size of the screw holes.
The PCB is mounted to the enclosure with screws and we do not know enough to choose the size/screws.

Describe the solution you'd like
A clear and concise description of what you want to happen.
Prefer a table of screw sizes of various metric screws and plastic types.

Describe alternatives you've considered
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Machine screw threaded metal inserts. Not ideal.

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[melanielaporte]

We found some interesting advice: https://www.google.com/search?q=hole+size+for+3mm+thread+forming+screws