How to account for waste
If part of your prints fail, the successful prints pay for them.
Cost per successful print = cost of one print ÷ (1 − failure rate)
For our standard print (50 grams, 5 hours) the cost without failures is €2.18. At 10% failures that becomes €2.42, at 30% €3.11.
Effect of failures on cost
| Failure rate | Cost per print | Extra cost | Increase |
|---|---|---|---|
| 0% | €2.18 | - | - |
| 2% | €2.22 | €0.04 | +2% |
| 5% | €2.29 | €0.11 | +5% |
| 10% | €2.42 | €0.24 | +11% |
| 20% | €2.72 | €0.54 | +25% |
| 30% | €3.11 | €0.93 | +43% |
The calculation assumes the full print. A print often fails halfway, in which case the cost is lower.
How to find your own failure rate
Note for a while whether each print succeeds. Divide the number of failed prints by the total. Enter that percentage in the calculator under "Failed prints".
How to lower failures
- Dry filament: see drying filament.
- Clean build plate: grease and dust are the most common cause of poor adhesion.
- Level well and check the first layer.
- Adjust supports and orientation for overhangs.
- Maintenance: a worn nozzle or build plate causes more failures, see maintenance cost.
Frequently asked questions
What percentage of prints fail normally?
That varies a lot by printer and experience. Count your own prints: divide the number of failed prints out of the last 20 by 20.
Why does the calculator use a failure rate?
Because failed prints cost material, electricity and print time you do not get back. Those costs are spread over the successful prints.
Does a failed print always cost the full print time?
No, prints often fail halfway. Our calculation assumes the full print and is therefore cautious.
How do I lower my failure rate?
Dry filament, a clean build plate, good bed leveling, checking the first layer and adjusting supports help the most.