Filament planning
Filament Needed Calculator
Plan enough material before starting a batch, then see whether the spool on hand has a sensible reserve.
How the calculation works
Total needed = part estimate × quantity × (1 + process allowance) × (1 + safety reserve).
How to use this result
A slicer estimate is a planning starting point, not a guarantee. Keep the reserve for variation, a longer prime line, or a failed start; use the Spool Remaining Calculator when you need to derive usable filament from a scale reading.
Example
Three 85 g parts with 5% process allowance and 10% reserve need more than the simple 255 g model total.