Support Material Estimator

Supports exist because FDM printing can't reliably extrude plastic into thin air — below roughly a 45-degree overhang angle from vertical, unsupported material starts to sag or fail entirely, and that 45-degree threshold is the pivot point this model is built around. At or above the threshold, the calculator estimates only minimal contact-point support (starting around 5% and tapering further as the angle increases); below it, required support volume climbs by 1 percentage point for every degree you drop, since shallower overhangs need progressively more scaffolding to stay printable. That base percentage is then scaled by a part-complexity multiplier (0.25 + complexity×0.45), reflecting that organic, highly detailed geometry generates far more internal overhangs and bridges than a simple block — a complexity-5 part can need roughly 3.6 times the support percentage of a complexity-1 part at the same overhang angle (a multiplier of 2.5 versus 0.7).

Support weight assumes a 70% density factor since slicers typically print supports as a sparse, easily-breakable lattice rather than solid infill, and removal time scales directly with that weight at a rate you adjust via the removal-difficulty input, from easy breakaway supports to hard-to-reach internal structures. The support-to-part volume ratio this produces is a useful design signal on its own: ratios above roughly 0.5 usually mean the part's orientation or geometry itself is worth reconsidering, since heavy support presence increases both material waste and the labor cost calculated here. Material cost defaults to typical PLA pricing and doesn't adjust for different support materials like PVA or breakaway composites.