I liked coolfooly's Ender 3 spool holder, especially the ease of installing it, but didn't like the angle it hung the spool at. While I liked the angle builditfull's held the spool at, I didn't want to use so many screws and t-nuts. So I mixed the two together!
I have 2 versions - for M4 and M5 screws respectively.The M5 version has room for nuts if you really want to secure it, but I've found it works just fine with just screws in either size.
I'll make any needed adjustments after logging some hours on it, but it seems to be working fine so far.