3D打印耗材长度、重量与成本计算器

计算原理

Filament is treated as a perfect cylinder, so the tool computes volume per metre as pi times the radius squared times 100 cm, then multiplies by the material density to get grams per metre. At 1.75 mm with PLA at 1.24 g/cm³ that is about 2.98 g/m; at 2.85 mm it is about 7.91 g/m. From there it converts in whichever direction you asked for, and cost is simply weight in kilograms multiplied by your price per kg.

Density and diameter are the two things that move the answer, and diameter matters more because it is squared. The material dropdown ranges from ABS at 1.04 g/cm³ up to CF-PLA at 1.30, with PLA 1.24 as the default. The Calculate dropdown picks the direction: length to weight, weight to length, or spool weighing. That last mode subtracts your empty spool weight (default 200 g) from the total on the scale (default 1100 g) to give what is left.

The maths assumes filament is exactly at its nominal diameter and perfectly round, which real filament is not — a spool held to plus or minus 0.03 mm carries a few percent of error, and because the radius is squared that error roughly doubles in the result. Densities are generic per material type, not per brand, and pigment-heavy or filled filaments drift from them. Nothing here accounts for purge towers, priming lines or failed prints, and cost is always shown with a dollar sign.

常见问题