The 9 costs small 3D print shops often miss.

A slicer gives you two useful numbers: estimated material and print time. Those numbers describe the job, not the business. A reliable price also needs to account for the attempts that fail, the person doing the work, the machine being consumed, and the costs that appear only after an item is ready to ship.

1. Supports, purge, and unusable material

Part weight may exclude supports, brims, purge lines, prime towers, color changes, calibration pieces, and small remnants that cannot be used efficiently. Use the slicer's total material estimate when available. Otherwise add a waste allowance and compare it with spool consumption over time.

2. Failed prints and rejected parts

A print can finish and still be unsellable because of warping, layer shifts, color mismatch, weak tolerances, surface defects, or damage during removal. Record failed and rejected attempts by product. A failure allowance spreads those repeat attempts across successful orders instead of treating them as surprises.

3. Setup and file preparation

Importing a file, checking licenses, orienting parts, choosing supports, changing filament, preparing the build plate, and monitoring the first layer are hands-on work. Custom orders may also require customer messages, measurements, revisions, or test pieces. Track minutes, not guesses about what the task “should” take.

4. Removal, finishing, and quality control

Support removal, sanding, vapor smoothing, painting, assembly, hardware installation, cleaning, tolerance checks, and photography can exceed setup time. Short print time does not mean low labor. Products that need extensive finishing should carry that work directly.

5. Machine wear and replacement

Nozzles, build surfaces, hotends, fans, belts, bearings, sensors, and entire printers have finite lives. A machine-hour rate can combine depreciation, maintenance, and a replacement reserve. Keep electricity separate if you also enter power cost, and keep labor separate from unattended machine time.

6. Electricity beyond a nameplate guess

A printer's rated wattage is usually a maximum, not average consumption. Heaters cycle, motors draw different loads, and enclosure or drying equipment may add power. A plug-in energy meter can provide a better average for recurring products. Convert average watts to kilowatt-hours and multiply by your actual local rate.

7. Packaging and order preparation

Boxes, mailers, tape, labels, padding, bags, inserts, desiccant, and protective finishing are easy to overlook because each item seems inexpensive. Add them as a cost per order. If an order contains several identical parts, a per-order cost should not be multiplied by quantity unless you actually use separate packaging.

8. Marketplace and payment fees

Percentage transaction fees, payment processing, fixed charges, listing fees, advertising, currency conversion, and country-specific taxes on fees can all affect the amount received. Fee structures change, so verify the current official schedule for your shop and combine only the charges that actually apply.

9. Returns, replacements, and general overhead

Customer replacements, refunds, damaged shipments, design software, commercial file licenses, storage, insurance, bookkeeping, advertising, workspace, and tax compliance may not belong to one part, but the business still pays them. Allocate direct costs to the order when practical. Recover broader overhead through machine and labor rates, a separate overhead allowance, or a margin target reviewed against your full accounts.

Use estimates, then close the loop

Choose one representative order and save the estimate. After fulfillment, record actual material, machine time, hands-on minutes, packaging, and selling fees. The difference between estimated and actual cost tells you which assumption deserves attention. Repeat this for your best sellers before fine-tuning every low-volume item.