How is support weight estimated?

Support weight is approximated as a fraction of the model weight: base ratio (set by overhang severity) scaled by the support density you choose. Severe overhangs with dense supports can add 30 to 60% of the model weight; gentle overhangs with sparse supports add under 10%. It is an estimate — the slicer gives the exact figure.

Why not just read the slicer figure?

The slicer is exact once you have a model, but this tool lets you budget filament and material before slicing, or compare how overhang severity and density settings will affect support consumption and cost for dual-material jobs.

Does support density really matter that much?

Yes. Support density scales support volume almost linearly. Dropping from 20% to 10% support density roughly halves the support material used while usually keeping enough contact for clean overhangs. Lower density also speeds up printing and removal.

How does this help dual-material prints?

When supports print in a second material (PVA, HIPS, or a breakaway filament) you are billed separately for them. This estimator isolates the support weight so you can cost the second spool independently — dissolvable supports often cost more per kg than the model material.

What overhang severity should I pick?

Gentle = mostly self-supporting parts with a few short overhangs. Moderate = typical functional parts with brims of supported area. Severe = organic, figurine, or heavily cantilevered geometry where supports touch most of the underside.

Support Material Weight Estimator

This tool estimates how much filament your support structures will consume, so you can budget material and cost before you ever slice. It is especially useful for dual-material jobs where supports print in a separate, often pricier, dissolvable filament.

How it works

Support weight scales with two things: how much of the model needs supporting (driven by overhang severity) and how dense those supports are. The estimate is:

Support weight = model weight x baseRatio(overhang) x (density% / referenceDensity%)

Each overhang level carries a base support ratio calibrated to a 20% support density reference: gentle around 0.08, moderate around 0.20, severe around 0.45. The chosen density then scales that ratio linearly — 10% density halves it, 40% roughly doubles it.

Worked example

A 120 g moderate-overhang functional bracket, supported at 15% density:

Base ratio (moderate) = 0.20 at the 20% reference
Density scale = 15 / 20 = 0.75
Support weight = 120 x 0.20 x 0.75 = 18 g
At 22 pounds/kg filament, supports cost 18 / 1000 x 22 = about 0.40

Total job weight is 120 + 18 = 138 g.

Tips and notes

This is an estimate. Once sliced, trust the slicer’s exact support figure.
Tree/organic supports use noticeably less material than grid supports for the same model — treat severe-overhang figures as worst case.
For dissolvable supports, price the support spool separately; PVA and HIPS often cost more per kg than PLA.
Lowering support density and raising the support Z-distance reduces both material and removal effort, at some risk to overhang quality.

All calculations run locally in your browser.