Boltless Ender-3 Side Spool Mount

This is a modified version of the Ender-3 Side Mount by DrStreet. Instead of requiring a bolt and T-nut to secure it to the frame I modified it to insert into both the top and side of the rail instead. It is a very snug fit, and some gentle hammering may be required to get it into place. The rail inserts could be sized down to make this looser, but I wanted a snug fit so that the spool holder didn't move at all.