When I made my pen blanks any resin that I had left over I poured into a plastic pipe with one end sealed. I cut this up today as there was just enough to play with. Anyway after cutting it into 1/4" thick slices and then cutting these discs in half I made these two rings and still have enough for about 9 or 10 more.
I don't believe in wasting anything. I turned them after sticking them to a block of wood in the chuck with the hot melt glue.
I only did while the pen kits that I had glued up ready for turning are drying.