Size, volume and weight of an STL
Drop the model and the width, depth and height in millimetres, the volume, the surface area and the weight in your plastic appear next to it. Select one part of a model, or several, to measure only those.
Saves model files for your slicer, never printer code. Opened and sliced in PrusaSlicer, OrcaSlicer, Bambu Studio and Cura.
Weight in your plastic
The weight is the volume times the density of the material — PLA 1.24 g/cm³, PETG 1.27, ABS 1.04, ASA 1.07, TPU 1.21, nylon 1.14, standard resin 1.15. It is the weight of a solid print, which is right for resin and the upper bound for FDM: with walls and infill a print weighs less, and the slicer’s estimate is the one to use for cost.
A model in the wrong units
STL has no units. If a model shows as 2 mm tall when it should be 50, it was drawn in inches — under Mirror, scale choose “drawn in inches” in Fix units, and it gets 25.4× bigger. One drawn in centimetres needs 10×.
Broken models
Volume needs a closed surface. On a model with holes the page still shows a figure, marked approximate; repair it for the exact one.
Questions
- Which way is width and which is height?
- As on a printer bed: width along X, depth along Y and height along Z, the same axes the slicer uses.
- Can I set an exact size?
- Yes — under Mirror, scale type the width, depth or height you want. With “keep proportions” the other two follow.