A really quick 'thing' that fits 25mm self adhesive tape so you can play about with positioning PCB's in an enclosure before drilling.
I've drilled plenty of holes only to realise I made a mistake and I can't fit something in place or it just looks bad. I suppose you could use these as final mounts if you wanted. The hole is 2.5mm which is good for M3.
It is offset from centre to give more options. Please feel free to improve the design ;-)
Select print settings that suit your needs, suggest you make it with a higher than normal infill to avoid the thread pulling out.