this is what i use as a beaglecam harness on my ender 3 v2. make sure that the size is correct and orientation.

the model has 2 problems so i added the gcode (as a document in 2 parts-just copy and paste them together) that you can print (this is what i used). i made this with pla+.

1-for some reason the program doesnt recognize the top part of the model (unlike when i first made it)

2-i had a bit of a tight fit so i had to split the cubic part and add some hot glue.

it works great for as long as i used it (about 2 years now)