Here are the standard densities for popular filaments: PLA: 1.24 g/cm³, ABS: 1.04 g/cm³, PETG: 1.27 g/cm³, TPU: 1.20 g/cm³, Nylon: 1.13 g/cm³, ASA: 1.07 g/cm³, Polycarbonate: 1.20 g/cm³, PP: 0.90 g/cm³, PVA: 1.19 g/cm³. Density affects how much filament you get per kilogram — lower density means more length for the same weight.

1.75mm is the most common diameter used by modern 3D printers (Ender, Prusa, Bambu Lab, etc.). It offers better extrusion control and requires less force. 2.85mm (often labeled as 3mm) is used by some older printers and a few industrial machines like Ultimaker. A 1.75mm spool contains about 2.6× more length than a 2.85mm spool of the same weight. Most hobbyists should choose 1.75mm.

The cost per meter depends on filament type, diameter, and spool price. For a standard 1.75mm PLA spool at $25/kg, the cost is approximately $0.075 per meter (or 7.5 cents/meter). PETG and ABS are similar. Premium materials like Nylon or Carbon Fiber can cost $0.15–$0.35 per meter. Use our calculator to find the exact cost for your specific setup.

To estimate print cost: (1) Slice your model in software like Cura or PrusaSlicer — it shows estimated filament weight in grams. (2) Use our calculator in "Weight → Length & Cost" mode, enter the grams shown by your slicer. (3) The calculator instantly shows the material cost. Don't forget to factor in electricity (typically $0.05–$0.50 per hour) and printer wear for a complete cost picture.

A standard 1kg spool of 1.75mm PLA contains approximately 335 meters (1,100 feet) of filament. For 2.85mm PLA, the same 1kg spool contains about 126 meters (415 feet). This varies slightly by brand due to density additives and pigments. Always check with our calculator using the specific density of your filament brand for the most accurate result.

PLA is generally the most cost-effective filament, with prices ranging from $12–$25 per kg. It has good density (1.24 g/cm³) giving you about 335m per kg at 1.75mm. ABS is also budget-friendly and has a lower density (1.04 g/cm³), meaning you get even more length per kg (~400m for 1.75mm). However, PLA is easier to print, requires no enclosure, and produces less odor, making it the best value for most users.

Slicer estimates include infill patterns, support structures, and prime/purge amounts. They calculate volume based on actual toolpaths and multiply by density. Our calculator computes solid filament length — the physical length on the spool. For print cost estimation, always use the slicer's weight estimate with our weight-to-cost calculation, as it accounts for the actual material used in the printed object.