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Filament inventory tool
Can the remaining spool finish this print?
Use an actual scale reading, the empty spool weight and an explicit safety reserve to check the next job before it starts.
Repeat-use workshop tool
Weigh a spool and check whether the next print can finish
Subtract the empty spool weight, convert the remainder to length, and keep an explicit safety reserve before committing the job.
remaining grams = gross spool − empty spool; usable grams = remaining × (1 − safety reserve)
Reliable inputs
The empty-spool weight is the critical subtraction.
Use the matching spool core
Empty spools vary by brand, material and construction. Use a published tare only when it matches the exact spool, or save the weight from an empty spool of the same type. Accessories, desiccant and adapters must be treated consistently.
Keep a safety reserve
Slicer grams are an estimate, scales have uncertainty and a small remainder may be difficult to feed reliably. The reserve is a user policy, not a universal percentage. Increase it for long unattended jobs or when the tare value is uncertain.
Length is secondary
Remaining meters are useful for comparison, but the sliced requirement is normally reported in grams. The finish check therefore compares usable remaining grams with job grams.
Visible formula
remaining grams = current gross spool weight − empty spool weightusable grams = remaining grams × (1 − safety reserve)A YES result means the entered usable amount exceeds the entered job requirement. It does not detect tangles, feed problems, brittle filament or a failed print.
Plan a full spool
Estimate accepted parts before production starts.
Use the 1kg yield tool to add per-part process material and expected rejects.
Calculate parts per spool →Calculation contract · reviewed 2026-08-26
See the source of each input, the formula, and the limit of the result.
Your slicer, invoices, energy tariff, and job records are the preferred inputs. Manufacturer documents support settings and specifications. Example defaults are editable assumptions that demonstrate the model—not measured results.
- Preferred input
- Your job records
- Verification
- Visible formula + unit checks
- Defaults
- Editable example assumptions
- Output use
- Planning comparison