For 3D printers with open filament libraries, Plural Additive Manufacturing’s filament calculator app helps users estimate the amount of filament left on the spool. Use filament more efficiently and ensure print jobs don’t run out of filament in the middle of the job. When users run a 3D printer all weekend for a big model; or make a full build tray of parts; or use up the last of expensive premium material like PEEK or Ultem, this app estimates the amount of remaining 3D printer filament. This app is ideal for open filament printers like 3ntr A2 and 3ntr A4, and compatible with any quality 3D printer.