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57mm NuNus Spool to Ultimaker 2 Adapter
This adapter ring snaps to the 57mm NuNus filament spools and makes them compatible with the 50mm spool holder of the Ultimaker 2. Print two and snap them to each side of the spool to adapt the diameter to the one of the Ultimaker 2 standard holder.
I printed mine with 100% infill for better stability.