Start with the number of whole build plates, even if the last one has spare capacity. An order of 25 parts at eight per plate takes four successful plates.
To estimate retries, divide those four plates by the success rate. At a 10% complete-plate failure rate, four divided by 0.90 gives about 4.44 attempts. At five hours per attempt, that is about 22.22 machine hours. Apply your own filament, electricity, wear, labor, and packing costs.
To estimate the price for a target margin, divide your order cost plus the fixed payment fee by one minus the percentage payment fee and the target margin. Use decimal fractions for both percentages. With the calculator’s sample inputs, the break-even price is $58.24 and the quote at a 25% margin is $80.64.
Print Batch Quote lets you repeat those calculations with your own inputs and export an estimate. It costs $15 once and runs offline in a desktop browser.