Small Spool with the Best Connection Joint I have ever done.

pinshape

I think it's worth trying out for yourself. The dimensions are roughly 2 3/8" in diameter or 58.35 mm, and 3/4" or 19.05 mm wide. The spool rim thickness comes in at about .089" or 2.25 mm. My Prusa I3 Dual Extruder printed it out very well. I used Design Spark Mechanical to create it, which you can find here: http://www.rs-online.com/designspark/electronics/eng/page/mechanical. I hope you like it! Have a great day! Photos are from a smaller test print than the one I originally published.