This X-axis bracket is designed for the Prusa MK4 and is an adapter for Sneaks articulating Raspberry Pi camera arm and for an optional reverse bowden tube for the MK4 (there is a .stl file without the reverse bowden adapter).
Due to its place on the left side of the X-axis, it is easy to route the Raspberry Pi camera cable to a Raspberry Pi that is mounted next to the electronics box of the MK4 (as can be seen in the pictures). (Here is a link to the Raspberry Pi case that I use.) On the side of the bracket is a slit through which the cable can be routed, so it doesn't sit to loose.
The only screw that is required should come with your MK4 as a replacement part. (It's a M3x18 screw)
If you want to use the reverse bowden setup, the only thing you need is a PTFE tube with an external diameter of 4 mm, the hole has the right size that you can just press it in there and it should fitt. To connect the other side of the reverse bowden tube to the printhead you can print my Prusa MK4 reverse bowden adapter.
The author remixed this model.
I designed a new X-axis bracket for the MK4, which also takes an optional reverse bowden tube.