About this 3D model

Since purchasing the Filastruder I needed something to hold the filament I've produced. I've seen the variable size holders but they require one's self to manually wind up the filament. I wanted to use a drill and had no empty spools (believe it or not.. lol) except the rep-rapper spools which have a VERY small center to them. So I designed this, holds 1kg of filament easily (Pictured holding 1092g) Center Spool is 70mm in diameter, 50mm across and 32mm in the center (same as the rep-rapper spools).