This is just a quick back cover that I threw together for my Ender-5. Printed upright with no supports.
edit - I have had a few people that comment that the tolerances are too tight on this. It was designed to the printer that I have and slides on easily with no play to speak of. As close as I could get to a perfect fit. You might want to test a small cross section of the print to check the width on yours. I would suggest scaling up maybe 2% or so if you feel that it is too tight.