Gantry Support for Ender 3 v3 SE or KE, with a cable chain. I couldn't find any gantry supports, that didn't require drilling holes or extra disassembly and that would fit flush with a cable chain bracket, so I made this simple support structure, with a little notch to go over the cable chain clip at the base of the gantry.

If you don't have a cable chain, just print 2 of the right supports and they will fit flush on both sides.

When they load into the slicer they'll probably be facing straight up and down, but it's easier to print them on their sides.