We just wanted to let all of our customers know that we had been experimenting with different spool sizes and we have now settled on the 8" (200mm) diameter with 2" (50mm) inner hole. These spools are also the same size as standard MakerBot Spools. We still have some stock which is on 6" spools and some of those have 1" inner holes. If you have a MakerBot printer we have patterns for alternate spool holders and we'll print one and throw it in with your order, just make a note when you place it. We'll happily do the same If you have a different printer and can point us to a Thingiverse model. Just keep in mind it may delay the order by a day.
Happy 3Ding all!