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. Ten printers, each losing one 12-hour job a week at an average 20% through, on 100 g jobs and $25/kg filament, throws away 200 g a week. That is $5 in material, which sounds like nothing until you add the 24 machine-hours and the operator time to notice and restart, and realise the same ten printers are also not producing anything sellable during those hours. Material is almost never the expensive part of a failure.

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