After printing multiple refill spools and them all taking 3-4+ hours to print each side, are wanted to try reducing the print time while still keeping the structural integrity. This spool can be printed at around 2.5 hours per side. This time may be able to be reduced even more if infill and outer walls are reduced. Ive only printed this in 0.2mm layer height, so there is added potential of reducing the print time even further. If you do print this in a layer height higher than 0.2mm please share in the comments. My goals are to drop the print time down to 1.5-2 hours per side while still being left with a spool that does its job efficiently. This spool still uses the original shim, and I've added holes on the outer rim to help keep filament from unraveling. I hope you enjoy.