This is a z axis linear rail mount for the Ender 6. I have added some supports for the bed rails to make the bed more sturdy than it currently is. It is also much easier to adjust the bed once you have everything lined up.
What you need:
T nuts: m3 x8 - for the top and bottom of the mount including the side screws: m3-12mm x 16 - to connect to the linear rail carriages. screws: m3-10mm x 24 - to connect to the carriages and T nuts for the bed rail
Linear Rails: 2 carriages mgn12h 500mm rails
Just duplicate the model for both sides.
you will want to install the rails first. the rails should be installed on the slot closest to the bed on the 2040 extrusion bar. When setting up the mounts I placed the screws in first to make things easier. I used a magnet to help hold the tnuts that will go in the indent that has the extrusion guides. It makes it easier to thread on. do not push the mounts all the way to the cross extrusion bar as i left space for movement to adjust based on if you are using a lead screw or a ball screw. When tightening the screws that have the tnuts on them i started on the top bracket then did the bottom bracket.