You won’t need any additional driver, since, as you already said, it is already included in the kernel.
However, as owner of a RX6600, I can tell you that the GPU will be quite loud sometimes. I can recommend you to check out LACT
, which let’s you define fan curves, which makes it A LOT less noisy.
Instead of using a caliper, like the others have said, you can measure the distance with your printer if you don’t have such a tool.
Just go into the “Move axis”-mode, and move your nozzle from the home position to the top layer.
Let’s say your coordinates are now X0, Y0 and Z49,3.
You can then move the object in your slicer by just changing your Z axis to -49,3.
Just make sure you: