Ender 3 pro spool mount

I've made 2 spool mounts of thing:2967567 and they kept falling apart when i mounted a 1kg spool. But that was because I've set the infill too low i think.

Anyway, I've made another and it works fine. (printed with infill on 60)
This one slides into the frame of the printer and it it's a strong enough fit. You can still slide it by hand and it stays put when printing

For Ender 3 Pro.

extra parts needed: 2x M4 nut

The 2 screws for mounting came with the ender 3 pro printer. I believe they are M4x16mm