Unlockable Filament Spool - 250mm diameter

UPDATE JAN 2018: Just beware this design (and the original for that matter) should be loaded with care. Recently I hand wound a 50m loose roll onto the spool to ensure no hitches and must have wound a little too tight in places. This resulted in a jam enough to cause an unattended print to fail. The spool itself rolls very nicely on a metal bar, so that wasn't the issue.
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I wanted a larger diameter filament spool than Christoph Laimer's original Unlockable Filament Spool design for larger