Ender 3 / Ender 3 Pro MGN12 Linear Y mod for 4020 rail version

There will be another pro template for drilling the stock bed but I don't have a step file for the Pro/V2 bed carriage (which is the same).

- Future improvements include threaded insert support for the limit switch and an adjustable Y belt tensioner. 

For a single top mounted MGN linear rail.
This set of files will allow you to convert your ender 3 or ender 3 pro with a bottom 2040 alluminum extrusion to MGN style linear rails this should in theory work with MGN9 but I used MGN12H.

Here's the rundown of how I came up with this: I had an extra MGN12H laying around after attempting to convert my V3 SE to a linear X axis and realized it's too big. I just got a couple ender 3 pro with a 2040 extrusion instead of the common 4040 extrusion I see on other people's ender 3 pros. Weird but ok. Kind of works out because you can use a single rail. but now you have to mount the rail to the side or re-route the belt and the first option is lame so I chose the latter. simple enough and a lot of printers I see online are practically entirely 3D printed and I have some ASA so frick it why not. And this is the result!

Please forgive the poor print quality in my pictures I was printing ASA at 160mm/s and my input shaping isn't perfectly tuned.

Feel free to improve my design, I want to see what you come up with!

I reused several parts to retain proper measurements.