There are very few items for the Kingroon brand printers and wanted to share mine in hopes that it helps someone else that wants a compact footprint for the printer and spool. This is a remix of a few different parts to give me a frame cap mountable spool holder with a guide arm. It fits into a 20x40 aluminum rail just above the z-rod. I merged all the components in Sketchup (with some revisions) and validated and fixed any errors with the model in Microsoft's 3D Builder before slicing it in Cura 4.1.0

UPDATE:
See my updated Kingroon Spool holder that fixes the center of gravity issue that this design can't overcome. https://www.thingiverse.com/thing:4622905