Estimate an SLS part’s mass by multiplying its geometry-derived volume by an explicit material density, after converting both quantities to compatible units. Keep units attached to inputs and outputs, validate every value, and treat the result as an estimate: its accuracy depends on the volume model, the density source, and manufacturing details.
How do you calculate the weight of an SLS 3D-printed part?
For a part’s estimated mass, use mass = volume × density. In everyday usage, people often call mass “weight”; this estimator returns mass, not a force measurement.
The units must match dimensionally. For example, volume in cubic centimeters multiplied by density in grams per cubic centimeter gives mass in grams. If the volume is in cubic millimeters while density is in grams per cubic centimeter, convert one quantity before multiplying.
The volume should represent the geometry you intend to estimate. A CAD model’s enclosed volume, for instance, may not capture every manufacturing detail that affects the finished part. The calculation is therefore an estimate, not a guarantee of the measured mass.
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What density should you use for an SLS part?
Make density an explicit input, or offer a material preset only when it is backed by a current, applicable technical datasheet. Check whether the stated value describes printed material or loose powder, which material and process variant it applies to, and the test method. A powder value is not automatically a finished-part density.
Do not apply one generic density to every SLS material. Formlabs’ material comparison includes Nylon 12 Tough, Nylon 12 White, Nylon 11, glass-filled and carbon-filled Nylon variants, and TPU 90A; its listed characteristics vary by material. Formlabs’ SLS material comparison presents manufacturer ratings for properties such as dimensional accuracy, surface finish, print speed, and feature behavior. These are the manufacturer’s comparative ratings, not independent test results from this article.
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Keep powder workflow figures separate from part density
Powder refresh rate and build packing density concern powder reuse and production efficiency. They are not inputs to the geometric mass equation. Formlabs reports a 30% refresh rate for Nylon 12 White on its product page; that figure describes powder practice for that material, not the density of a finished part. Formlabs Nylon 12 White
Similarly, Formlabs’ cost-per-part discussion uses build-level quantities such as total, sintered and unsintered powder, packing density, and refresh rate to explain powder efficiency. Those production figures do not replace a part’s volume and finished-material density in a mass estimate. Formlabs’ SLS cost-per-part explanation
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Design a unit-safe estimator
JavaScript does not inherently enforce physical dimensions. Unit safety has to come from your application design: represent each quantity with a value and unit, support only known units, convert explicitly, and reject invalid inputs.
- Accept labeled quantities. Take volume with its unit, density with its unit, and the requested mass unit. Do not accept unlabeled numbers whose units must be guessed.
- Validate the inputs. Confirm that numeric values are finite and positive and that every unit is supported. Reject zero, negative values,
NaN, infinity, and unknown unit labels with a useful error. - Normalize before multiplying. Convert volume and density to a compatible canonical pair, such as cm³ and g/cm³. Alternatively, use explicit, tested conversion factors. Do not multiply raw numbers expressed in incompatible units.
- Calculate and convert the result. Multiply the normalized volume by the normalized density, then convert the mass to the requested output unit.
- Return context with the number. Include the output unit and the density source or note that density was supplied by the user. Preserve this context when displaying or exporting the estimate.
Example JavaScript implementation
This small example supports volume in cm³ or mm³, density in g/cm³, and output in g or kg. It converts volume to cm³ before multiplication, so the unit relationship is explicit. The caller must provide a density that is appropriate for the material and estimate.
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const volumeToCm3 = {
cm3: 1,
mm3: 0.001
};
const gramsToOutput = {
g: 1,
kg: 0.001
};
function estimateSlsMass({ volume, volumeUnit, density, densityUnit, outputUnit, densitySource }) {
if (!Number.isFinite(volume) || volume <= 0) {
throw new RangeError("Volume must be a finite positive number.");
}
if (!Number.isFinite(density) || density <= 0) {
throw new RangeError("Density must be a finite positive number.");
}
if (!(volumeUnit in volumeToCm3)) {
throw new Error("Unsupported volume unit.");
}
if (densityUnit !== "g/cm3") {
throw new Error("Unsupported density unit. Expected g/cm3.");
}
if (!(outputUnit in gramsToOutput)) {
throw new Error("Unsupported output mass unit.");
}
if (typeof densitySource !== "string" || densitySource.trim() === "") {
throw new Error("Provide a density source or identify it as user-supplied.");
}
const volumeCm3 = volume * volumeToCm3[volumeUnit];
const massGrams = volumeCm3 * density;
const value = massGrams * gramsToOutput[outputUnit];
return {
value,
unit: outputUnit,
density: { value: density, unit: densityUnit, source: densitySource }
};
}
const estimate = estimateSlsMass({
volume: 12000,
volumeUnit: "mm3",
density: 1.0,
densityUnit: "g/cm3",
outputUnit: "g",
densitySource: "User-supplied value; verify against applicable printed-material data"
});The example’s density is deliberately illustrative, not a recommended value for any SLS material. With the example inputs, the converted volume is 12 cm³ and the calculated result is 12 g; the arithmetic does not establish whether the supplied density is accurate for a particular printed part. In a production estimator, document the allowed units, keep conversion factors centralized, and add tests for each supported conversion and invalid-input case.
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