This mount uses my remixed 2020 twist-lock mounts and a remix of the camera mount designed by HenryS to put a camera on a 3D printer such as my Ender 5 Plus.

https://www.printables.com/model/123074-ceiling-camera-mount-2-axis

The “head” part prints fine without supports as modeled. The base should be printed sideways, as modeled, with tree supports touching buildplate. The pin is tricky; I've had best results turning it upside down and printing it with tree supports touching buildplate. All models print fine at 0.2 layer height.

I've expanded the holes in the flex joint to accept M6 and ¼-20 screws for convenience. The knob I'm using in the photo to retain the camera is this one by Frugal Shave:

https://www.printables.com/model/197141-1-diameter-knurled-knob-for-14x20-nuts-and-bolts

but any knob that works with a ¼-20 bolt would work, or you could make a permanent installation if you prefer.

Finally, the phone holder in the photo is the one by jakejake here:

https://www.thingiverse.com/thing:2423960

using the redesigned threaded section here:

https://www.printables.com/model/201088-universal-phone-tripod-mount-normal-thickness-nut-

… i think that's everything. gah.