The numbers
| Sells for | $10 to $18 |
|---|---|
| Print time | 0.7 to 1.2 h |
| Filament | 10 to 20 g |
| Cost per item | $4.06 |
| Marketplace fees | $1.78 |
| Left per sale | $8.16 |
| Per print hour | $8.59 |
| Demand (niche) | Medium |
| Competition | Low |
| Legal and licence risk | Low |
| Evidence | Seen on Etsy |
Estimates for one item at the middle of the price range, after filament, power, machine wear, marketplace fees and your time at $15 an hour. Shipping not included. Not sales data.
How the score adds up
Profit per print hour26/30
Demand15/25
Low competition20/20
Low legal risk15/15
Evidence quality2/10
Demand and legal risk come from the niche Vintage audio and radio knobs.
Seen for sale: Amplifier Knobs, 3D Printed Volume Knobs for ZK Audio Amps (Set of 3). Prices change, open the listing to check.
Why it can work
- Few sellers compared with other products
- Estimated $8.59 profit per print hour
- Low brand or licence risk if the design is your own
Why it might fail
- Thin public evidence, so treat these numbers with care
Be aware before you sell
Files for specific radios are scattered and most licences were not checked, so measure and model your own. Say 'fits Marantz' rather than copying logos, and leave brand marks off the knob face. Etsy asks for your own original design, so a licensed file may not qualify.
Check your versionRun your own numbers