Spool and holder was redesigned.  M3 screw is used a s shaft for the spool to rotate about and keep the cap on the spool holder.  Printed test part from PLA, spool in two pieces and glued together.  Spool has 3mm hex for winding solder with a drill.  Spool spins freely on the M3 screw.  Superglue test fit works nicely.  Going to update design to make feeder and spool holder from single resin print, might as well print the rest from resin then too.