Cosplay & Prop Finishing Cost Calculator
Sanding, filler primer, paint, and clear coat turn a visibly 3D-printed part into something that reads as injection-molded, and it's often a bigger cost than people budget for. This tool covers that layer specifically.
This page is finishing supplies only. For the print itself, material, electricity, machine time, use the price calculator or the filament cost calculator for multi-part builds, then add this tool's total to that one.
Calculator
Estimates only. Actual supply use varies by part size, surface complexity, and finish quality.
How it works
- Enter what you'll spend on each finishing category. Defaults are reasonable starting points, not exact prices, edit them to match your actual supplies.
- Add reference or fit-research time if it applies. Matching a specific character's proportions, or fitting armor to a real body, is real billable time on commission work. Leave it at zero for personal builds.
- Read the breakdown. You get a total, a rough per-part figure, and where the money actually goes.
- Add this to your print cost from the price calculator or filament cost calculator for the full project budget. This tool intentionally stops at finishing.
Worked example
A 5-part helmet build, one visor and four armor pieces, needs a pack of sandpaper ($8), a tube of filler for the seams ($7), three cans of filler primer for two to three coats ($27), two cans of paint for a two-tone scheme ($18), and one can of clear coat ($9). That's $69.00 in finishing supplies alone, before the print cost, or about $13.80 per part as a rough average.
Filler primer is the single line item most people underestimate. It's what buries the layer lines that give a print away, and getting a smooth, paintable surface usually takes two to three coats with a light sanding pass between each one, not one quick spray.
Related guides
Frequently asked questions
Why isn't print cost included here?
This tool covers finishing supplies specifically. Use the price calculator for material, electricity, machine time, and labor, then add both totals together for your full project budget.
What's "filler primer" and why does it matter so much?
It's a high-build spray primer that fills shallow surface defects, like layer lines, as it dries, so you can sand back to a smooth, level surface without removing part material. It's the standard route for cosplay props and any part where the final look matters more than dimensional accuracy.
How many coats of primer do I actually need?
Two to three coats is standard, sanding lightly between each one and checking under raking light for remaining lines. Rougher prints or larger surfaces may need an extra cycle.
Does this apply to resin prints too?
Yes, though resin prints start smoother and typically need less aggressive sanding, often starting around 400-grit instead of the 120-grit starting point common for FDM prints.
About the author
Cedrick Reese founded Ready Utilities to build free, user-friendly online tools that simplify everyday tasks. His path started in the early 2000s with affiliate marketing and niche site development, which grew into a passion for practical digital utilities and calculators. After retiring from the military, he earned a Computer Systems Technician certificate from UEI College, completed Electro-Mechanical Technologies at Tulsa Welding School, and finished the Carpentry program at Florida State College at Jacksonville. Today he combines that technical background with traditional woodworking, gardening, and building tools like this one. Read more about Ready Utilities.
This calculator provides cost estimates for informational purposes and isn't a substitute for your own bookkeeping. Some links on this site may be affiliate links; see our affiliate disclosure.