I have to wonder if it wouldn't be more feasible to mill that out of aluminum bar stock.
Krax, what would be the cost of materials alone for that, let alone time investment? (BTW that's a real question, not rhetorical.

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I made one out of a 1/8 piece of Kydex I had laying around the shop. Took a while to make it, that’s why I’d rather buy something already made.
Yeah, as with most things like this, it's that time investment that is the killer. Out of curiosity, what are the 3 holes around each female thread piece for? Does it serve a mechanical purpose that would be worth adding to the 3D-printable model?
(EDIT: nevermind; it's for the 3 little teeth on the T-Nuts, right? That's something I'll add to the design, then.)
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As for the model, I'm going to fiddle with it a bit right now, then get a test print out of PET going to see how long it takes and afterwards, how much abuse it can handle. I'm also going to dig out my Box of Bad Ideas as, although I don't own an Omnivore, I
do have access to a Safariland holster at the moment, so I can at least check on the Safariland-on-Blackhawk-rig that Sirjofx mentioned (...way back in March, but hey; this thread came back from the dead last week, so I might as well take a look at it.)