3D Print Failure Cost Calculator

A spaghetti failure at hour 14 of a 15-hour print stings in a way that is hard to quantify. This calculator does it for you.

What gets wasted

When a print fails at N% completion, three things are gone:

• The filament used up to that point (N% of the total job filament)
• The electricity consumed running the printer and heated bed
• Your time, if you are running a print farm or charging clients by the hour

The formulas are straightforward:

filament_cost = (total_g x (pct / 100) / 1000) x price_per_kg electricity_cost = (printer_watts / 1000) x (total_hours x pct / 100) x rate time_cost = hourly_rate x (total_hours x pct / 100) total_loss = filament_cost + electricity_cost + time_cost

Why failure point matters more than you think

A failure at 5% completion wastes almost nothing except the time to restart. A failure at 95% is nearly the full print cost with nothing to show for it. The loss scales linearly with completion percentage, so an early detection system (camera-based spaghetti detection, filament runout sensor) pays for itself by catching failures early.

Print farm context. Running 10 printers, each averaging one failed print per week on 12-hour jobs, at 20% average completion point and $25/kg filament, with 100g average per job, is roughly $5-15/week in material waste alone. That does not include the operator time to notice and restart.

Set the hourly rate to 0 if you are printing for personal use and not counting your own time.