No need to reinvent the wheel, the original works really well but didn't sit well on my Ender 6 so I remade the base.

My C270 now sits nicely on the back of my printer with this mount sitting on top of the extrusion.

I printed it with 80% infill as the first time I tried with 20% I snapped the stem off being a little rough. Now I can be as rough as I want as it ain't breaking in a hurry and didn't take much longer to print.

A couple M3 nuts and bolts with a drop-in T-nut from here;
https://www.thingiverse.com/thing:3050607
and you re-use the pin from the original with the screws to hold that in, she fits nice and tight without any issues.

(excuse the terrible print quality in the pic lol, was a draft).

80