Nothing apart from the original hotplate_bottom.stl has been modified.

On this part, I added the Arca-Swiss slots in the front and back of the hotplate, so you can still use something like the Joby gorillapod when out and about.

I printed mine with the larger hole facing upwards, so it does not require any supports.

You might want to consider printing it on it's side for added strength, however I have not had any issues with mine printed flat.

WARNING: Use this at your own risk and always make sure your camera is fine, even if the hotplate does break (it is just plastic, after all). I recommend only using this in orientations where there is not a lot of force on the hotplate (i.e. small to medium size lens, upright) and not with things like super front-heavy lenses or weird angles.

STEP and FreeCAD files included if you wish to modify it to fit your needs (not original, but reverse-engineered from original STL).