So I really liked the design of the spool holder made by @Fargo3DPrinting but I didn't like the flex or the fact that it wasn't big enough to use the old Makerbot Spools.

I recreated the design by extending the spool holder out more so there is more room for bigger spools and add some support to make the design more robust for heavier spools. Now there is less flex than the original design.