CR-10S - On-Printer Spool Holder Mount

This is an alternate mounting system for the Hictop CR-10S spool holder. Instead of attaching the holder to the control box, this mount lets you attach it to the top of the printer, directly onto the frame.

The mount is designed to grip the CR-10S' frame using inserts that match its X-shape lateral grooves. If printed with reasonable quality, the part with go in without any force, and the leverage from the spool will lock in in place. The mount also features two holes designed to fit the CR-10S' spool holder's screws.

The system overall feels much tighter to me now, as the filament is no longer attached to two potentially moving pieces (printer & control box). Instead, the spool is now always at a very specific position relative to the extruder infeed, even when the printer (or the control box) is moved.

Also (and this was the original reason for making this), this mount has also opened up a significant amount of space on my work area as I can now fit the control box in a muc