Parametric Lightweight MasterSpool

prusaprinters

<h3>Parametric Lightweight MasterSpool</h3><h4>Parametric Design</h4><ul><li>default parameters implements RichRap's MasterSpool specifications</li><li>light weight with great stability (default 69 g using 1.24 g/cm^3 filament)</li><li>can easily be made even more stable through variation of parameters</li><li>can be made wider or narrower to fit your filament refills</li><li>bolts together with 3 screws for secure assembly, no snagging on cable ties</li><li>default requires 3 x M4 (40 mm length) screws with hex nuts</li><li>can be adjusted to use non-metric screws</li></ul><h4>Philosophy</h4><p>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.</p><h4>Assembly</h4><ul><li>Put refill coil on spool</li><li>Insert filament end in appropriate retaining hole</li><li>Insert nuts and screws</li><li>Tighten screws.</li><li>Cut cable ties</li></ul><h4>Weights with 1.24 g/cm^3 filament:</h4><ul><li>69 g @ w_side 1.2 mm, th_spool = 1 mm, rc_holes = 5 mm, constant-width spokes, minimal hub</li><li>82 g @ w_side 1.2 mm, th_spool = 1 mm, d_holes = 32 mm, radial holes, minimal hub</li><li>94 g @ w_side 1.2 mm, th_spool = 1 mm, d_holes = 32 mm</li><li>112 g @ default values (w_side 1.5 mm, th_spool = 1,2 mm, d_holes = 30 mm)</li></ul>