Could you not have blind holes so that you could glue metal threaded inserts in and use machine screws? That would be a neater solution than self tappers.
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What do you think of making a thick ring on the base? That would save a lot of PLA and work just as well, I reckon. What is the radius of the mounting holes in the adapter @Wayward ?
That’s what I’d do. 
Adam sticks his fingers in his ears when I suggest things like that. 
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Yeah that would work, good plan!
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Self tappers are for butchers…
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The PCD is 90mm as mentioned.
I’d go with Paul’s suggestion, but I understand your preference to cut corners where possible. 
I’ll see if I can find the CAD files for the adapters.
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I’ve sent you the file for the adapter.
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How many holes? Or CAD file is fine.
These, then?
Those would likely pull out. I’d use something more like this:
Actually, I have some M6 threaded inserts that you could use.
Stupid link doesn’t work properly. Click on the second option:
Gives more of a ridge to secure them.
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Or glue some of these in - I have lots:
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What about screw in ones, with glue added?
Yeah, as post above. I have lots.
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And don’t just use any old shite, find some Loctite Threadlock. There’ll be one suitable for the metal/plastic combination you use.
Can’t I just use @MGOwner ?
PLA is thermoplastic, so you could make the holes undersized and heat the inserts to insert them.
“Heatserts” are a thing for 3D printed stuff.
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Well there’s ten minutes I just spent on the Henkel Adhesives website that I’m never gonna get back
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Or just cast them in with expoxy?
Yeah, if they’re knurled but if they have a thread and you’re going to screw them in, I would use the Loctite
Threads in PLA are a bit crap, so I’d prefer plain holes and epoxy them in. But if the threads print ok, then yeah.
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