About FilamentMath
Built by someone who actually ships orders — not someone who just writes about it.
FilamentMath started with a simple frustration: every 3D print pricing method I found online was either too simple to be accurate, or too complicated to actually use. So I built the calculator I wished I had when I started selling.
The Problem
When I started selling 3D printed replacement parts, I did what everyone does — I looked up "how to price 3D prints" and found the same advice everywhere: charge $4/hour plus double your material cost, or just triple your filament cost and call it a day.
Those formulas are easy to remember. They're also wrong — or at least incomplete. They don't account for machine depreciation, electricity, the 15 minutes you spend removing supports and sanding edges, your failure rate, or the 13% eBay takes off the top when you finally sell it.
I was selling parts for what I thought was a 50% margin and finding out my actual profit was closer to 15% once I tracked every real cost. That's not a business — that's an expensive hobby.
The Solution
FilamentMath factors in everything: material cost per gram, machine depreciation over its expected lifespan, electricity at your local rate, your actual labor time (setup, post-processing, packaging), a failure buffer so one bad print doesn't wipe out your profit, and marketplace fees for wherever you sell.
Then it compares your real price against the common "quick formulas" so you can see exactly how much money you'd leave on the table — or worse, how much you'd lose — using the simplified methods.
It's the calculator I use for my own business. Now it's yours too, for free.
Who's Behind This
I'm a 3D printing seller running a small operation with Bambu Lab printers, primarily using ASA filament for durable replacement parts — RV components, discontinued appliance parts, and specialty hardware that manufacturers stopped making.
I sell on eBay, Etsy, and through my own site. I price every single listing through this calculator before it goes live. The articles in the Learn section come from things I've actually tested, tracked, and learned the hard way — not from rewriting what some other blog already said.
FilamentMath is a free tool because I believe the 3D printing seller community deserves better resources than "just triple your filament cost." If it helps you price smarter, that's a win.