This 15mm Camera Rail (60mm) system is made for Sony A6_00 Cameras with Smallrig Camera Cage.
I get the rails on my local hardware store. 15mmx100cm so I made two 30cm rails and two 20cm rails.
I may ad a lens support and a way to mount the setup on a tripod soon.

To clamp the rails in place you need:
6x M4x20
6x M4 Nuts
For the battery adapter
1x M5x15
1xM5 Nut
And of cause for the camera/cage
2x 1/4"x 0.5" srews. thats 13.56mm.

To press the nuts into the plastic, just pull it in with the fitting screw. For the M4 screws you may need a M4x25 for pressing the nuts into place.

Ender 3

No

No

0.20

20

0.6mm Nozzle