Sharing this on the off-chance it is useful for someone. I couldn't find one that worked well so I stole an airsoft one that sort of worked and made it better. Requires 1 M5x25 bolt and nut.
The only printable dedicated Mat-9 lower so far that I'm aware of. It is essentially a chopped and frankensteined AWCY Evo AR9 lower with the rear curve of YZY's Montgo lower. Also included is a modified version of Yzy's Montgo-9 which is cut down at the front end to offer a better magwell grip along with a handguard that slides onto the bottom pic rail and meshes seamlessly with the lower (it may take some coercion to put on). Enjoy
This is a printable mold to create a silicone Corona, the flash can version of the Crescent, for reasons
Feedback from an HONEST TO GOD TESTER OF THE CESCUSSY. GOD HAVE MERCY:
I had to add indexing pins, otherwise the pieces will slide on each other and not stay put. But the indexing pins prevent the top/insert piece from unscrewing liken a corkscrew. I had to pry from the bottom and wedge it out of the mold
And then even with the silicone on the insert print, it wouldn't unscrew, i had to peel my edges up and work it off
But I'm also using 00-30 shore hardness of silicone, so it could've just been my choice too, and maybe a harder silicone would unscrew better
Hide your shame with these nifty slide on (lightly tap) covers
Print in default orientation with normal supports. Maybe treat yourself with a little ironing
Chaos Invader V2 - An effort to add a picatinny rail to the rear of Digital Nimbus' Glock 17 Invader and also modify aesthetics. Also includes an optional slide overmold that works with oem glock gen3 slides which adds two side charging handles for easier use. No critical geometry has been modified but still, use at your own risk.
Further info:
The front end is affixed with an m2 bolt through the underside of the slide and screwed into a nut on top within the recess of the overmold. Then the back affixes via 3 m4s into the extended backplate. It also engages with the vertical slide serrations on the rear and is overall very snug once seated. Hope that helps!