Why does a 1 kg spool of PLA print more parts than 1 kg of TPU? Density. Here's what every buyer should know.
Density = length per kg
Filament is sold by weight, but you print by length. 1 kg of PLA (1.24 g/cm³) contains roughly 330 m of 1.75 mm filament; 1 kg of flexible TPU (1.21 g/cm³) is similar; denser materials like PETG (1.27 g/cm³) give slightly less length per kg.
Why it matters
- Part costing: calculate grams per part, not spools per month
- Fair price comparison: compare $/kg, then adjust for density
- Net vs gross weight: some listings include the spool — always check "net filament weight"
Common densities (g/cm³)
PLA 1.24 · PLA+ 1.25 · PETG 1.27 · ABS 1.04 · ASA 1.07 · PA 1.14 · PA-CF 1.21 · PC 1.20 · TPU 1.21
Full density data for every VOXFIL material is on each product page and in the free data pack.