Appliance knob replacementMatch and print a lost oven or washer knobSells for $35 to $90About 1.6 h, 22 g, leaves $51.78Try more per plateIdea to test
Score69Worth testingPer print hour$32.37GreatCompetitionSome sellersSpecific products to sell
Pick one of these, not the whole niche. Numbers are our estimates for one item.
Board game piece replacementPrint a missing token, stand or tile for a gameSells for $20 to $50About 1.1 h, 15 g, leaves $27.14Try more per plateIdea to test
Score69Worth testingPer print hour$24.67GreatCompetitionFew sellersVintage car trim partReverse engineer a lost interior trim piece for a classicSells for $150 to $400About 6.5 h, 85 g, leaves $241.77Try more per plateIdea to test
Score60Worth testingPer print hour$37.20GreatCompetitionFew sellersReverse engineered broken partCustomer ships the part, receives a measured copySells for $100 to $400About 5 h, 80 g, leaves $219.53Try more per plateSeen for sale
Score60Worth testingPer print hour$43.91GreatCompetitionSome sellersA typical product here: Appliance knob replacement
Where each $210.00 sale goes
Filament, power, your time $4.33Marketplace fees $6.39Left from this sale $51.78
One sale ties up the printer for about 1.6 hours. $51.78 ÷ 1.6 h = $32.37 per print hour.
At the mid price, if it sells. Shipping not included.
Why it can work
- Customers have no other way to get the part
- Pay is for skill, not plastic
- Each finished file can become a catalogue item
Why it might fail
- Hard to quote and hours can overrun
- Fit may need several rounds
- Safety-critical requests must be refused
Be aware before you sell
You own the CAD you create, so state in your terms who keeps the file. Copying a single part for repair is usually lower risk, but check design rights and refuse branded logos. Etsy asks for your own original design, so a licensed file may not qualify.
How to get a file you may sell
- Make your own. Tinkercad is free and enough for simple shapes.
- Buy a commercial licence. Many designers on Cults3D, MyMiniFactory and Etsy sell one. Read what it allows.
- Use open licences. CC0 and CC BY allow selling prints. NC does not. Filter by licence on Printables or MakerWorld and keep a screenshot.
Search live listings
More detail
Our take
Selling skilled CAD time avoids the race to the bottom on filament, but the $500 to $1,500 figure comes from one vendor's scan-based workflow and small jobs will be far lower. It works with a paid fit sample first and a written refusal of brake, fuel or other safety-critical parts, and it fails when jobs are quoted too cheaply.
How the score adds up
Profit per print hour30/30
Demand15/25
Low competition12/20
Low legal risk15/15
Evidence quality2/10
The score is our estimate from public prices and signals, not sales data. Evidence confidence: low.
Competition
Freelancers on Fiverr and CAD Crowd and local print shops offer this, but most quote per job and few specialise in a niche.
- I will reverse engineer your broken part and ship you a replacement Fiverr not confirmed
Make it your own
- Solve one specific problem better than generic listings
- Test one original design before making more
- Show a real photo and honest measurements
Where to find 3D files
Use these for research. Check each licence and never assume you may sell a print. Search links show live results.
We have not confirmed any yet.
Demand signals
- Fiverr sellers offer to reverse engineer a broken part and ship a replacement. source
- Xometry published a case study of a printed gear rack saving a massage chair. source
- A Czech firm documented reverse engineering an unavailable Renault headlight cover. source
- GoodPrints3D published a buyer's guide to ordering a replacement part service. source
Check your own numbersRead the outdoors and sports guide
SpoolPilot Ad (Anzeige)iPhone app tracking profit, marketplace fees and filament for 3D print sellers.
