Resin version of the solder feeder finished printing.  Looks nice.  

Whipped up a design for an integrated solder spool.  It has a threaded section to mount onto the solder feeder.  One side of the spool is secured with a screw after installing in the mount.  4mm hex allowed spinning the spool with a drill to load solder onto the spool.  Printed out the spool in PLA+ for testing and super glued it in place.  It turns pretty freely by hand, however feeding the solder off the spool was too difficult.  The whole outer edges of the spool rub along the mount.  Might work better with a cleaner print.  I was trying to keep design simple but might need a bearing or at least a smooth metal shaft to make it work.