This is a .dxf for a replacement y-axis carriage(to be water-jetted or laser-cut) for the tronxy X3 because I was sick of the warping of the acrylic bed. I imagine with some easy adaptation it could be used with other printers. I made it fairly universal, it can be used with 20/20 and 20/40 extrusion and also has spacing for 4 LM8UU bearing blocks. You can also modify it to fill in holes and add holes if you would like.
This is still a work in progress as I havent installed it yet(though everything lines up perfectly), but I will update it as I install and print pieces for it.
Alright so I've used this on my printer for a few weeks, it works great. It is not without its caveats however...the slots for the wheels make it difficult to center and keep it tight, The slots and cutouts for the heated bed are kind of a pita, where the belt is supposed to be secured is a little too high in my setup, and pulls the belts awkwardly. Its well worth it if you can get it cutout for cheap though thats for sure! Otherwise I would check out the universal build plate from open builds.
For tronxy x3 users I would Highly suggest http://www.thingiverse.com/thing:2215722
my wheel tensioner if you are going to stick with 2020 extrusion.