This is a heatbed mount for the absolutely perfect Articulated camera mount. The fit is very snug and the part might need a little cleanup and filing before use.
All other parts can be found in the original model
For ABS which shrinks a little bit, I had to set up Slicer to print this in 105% size. You can print it in PLA on 100%, but it will probably bend from the heat emitted by the heatbed. ABS survives the high temperatures pretty well. Supports are not necessary, but the ABS sinks down a little bit so you have to cleanup the finished print
The printing orientation of the part should be fine, if you have problems with it, you can set up a brim, which should keep the part in place securely.