Parametric Lightweight MasterSpool

Parametric Design

• default parameters implements RichRap's MasterSpool specifications
• light weight with great stability (default 69 g using 1.24 g/cm^3 filament)
• can easily be made even more stable through variation of parameters
• can be made wider or narrower to fit your filament refills
• bolts together with 3 screws for secure assembly, no snagging on cable ties
• default requires 3 x M4 (40 mm length) screws with hex nuts
• can be adjusted to use non-metric screws

Philosophy

I was looking for a bolt-together Masterspool, preferrably of light weight. Twist assembly with a central thread didn't seem appropriate and incur a weight penalty. So I designed one that bolts together. It needs screws, but I'm confident they'll pay for themselves in terms of saved filament.

Assembly

• Put refill coil on spool
• Insert filament end in appropriate retaining hole
• Insert nuts and screws
• Tighten screws.
• Cut cable ties

Weights with 1.24 g/cm^3 filament:

• 69 g @ w_side 1.2 mm, th_spool = 1 mm, rc_holes = 5 mm, constant-width spokes, minimal hub
• 82 g @ w_side 1.2 mm, th_spool = 1 mm, d_holes = 32 mm, radial holes, minimal hub
• 94 g @ w_side 1.2 mm, th_spool = 1 mm, d_holes = 32 mm
• 112 g @ default values (w_side 1.5 mm, th_spool = 1,2 mm, d_holes = 30 mm)