Starter guide

3D-Printed Products

A machine makes the thing while you're at school.

$0 to $400
Hard

A machine makes the thing while you're at school. That's the appeal, and it's real. You design or find a design, the printer runs for six hours, and you have a product to sell. Phone stands, desk organizers, board game pieces, custom keychains, replacement parts for things people broke. The trick is that the printer is not the business. Finding something people actually want printed is the business.

Start for free

Start where the printer is free

You almost certainly do not need to buy a printer yet. Most public libraries have one, and many schools do too. Some charge a dollar or two for materials.

Go print three things at the library and try to sell them. Ask:

"I can print custom [thing] in any color. They're [your price]. Want one?"

If you sell ten items using someone else's machine, you have proven the business and you'll know exactly which printer to buy. If you sell zero, you just avoided spending four hundred dollars on a machine that would sit in your closet.

The plan

Your simple plan

  1. Solve one specific problem. A stand for a specific game console, an organizer for a specific hobby. Specific sells fast. "I can print anything" sells nothing.
  2. Print on order, not on speculation. A printer running for a customer is a business. A printer running to build inventory is a hobby with an electric bill.
  3. Price for time, not just plastic. A print might use eighty cents of filament and eight hours of machine time. Charge for the wait, the design, and the finishing, not the material.
  4. Sell where your buyers already gather. Hobby groups, game shops, local sports teams, online communities for whatever niche you picked.
The gear

What you need, and what you can skip

If your library test worked and you're ready to own one, here's the real list.

Get these
  • An entry-level FDM printer that's known for working out of the box. Shop this
  • PLA filament in a few colors. Shop this
  • A set of removal and finishing tools, including flush cutters. Shop this
  • Digital calipers for measuring parts you're designing around. Shop this
  • A filament dry box, because wet filament ruins prints. Shop this
  • Extra nozzles and a spare build surface. Shop this
Skip these for now
  • A resin printer. Better detail, but it involves chemicals, fumes, and cleanup.
  • Paid CAD software. Free tools are more than enough to start.
  • A second printer. Not until the first one is booked solid with paid orders.

As an Amazon Associate I earn from qualifying purchases. We only list gear the guide actually calls for, and the skip list is there because most of it you do not need yet.

The lesson from the book

Sophie's biggest early advantage was that she started with nothing and had to be resourceful, so she learned what sold before she ever had money to lose. Use somebody else's printer first. It feels like the slow way. It's actually the smart way, because you get all of the learning and none of the risk. Then buy the machine with money the business made, not money you borrowed on a hunch.

The full program

Ready to build the whole thing?

The full Young Founder kit walks you through everything Andre and Sophie learned: how to test an idea before you fund it, price for your time, and find the customers who want exactly what you make. The book, the workbook, the videos, and more.

See what is inside the kit

Questions about this idea

What should a kid charge to walk a dog?

A kid walking dogs in their own neighborhood usually starts between $10 and $18 for a thirty minute walk. Professional walkers average about $21 for the same walk.

Read the answer

How much money does a kid need to start a business?

Less than almost anyone expects, and for a lot of these ideas the honest answer is nothing until somebody has already said yes to a price.

Read the answer

How does a kid find their first customer?

Ten people who already know them, one prepared sentence, and an easy way for each of them to say no.

Read the answer

What do I do when my kid wants to quit?

Find out whether this is not working or just not fun right now. Those look identical from outside and they need opposite responses.

Read the answer

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Window Washing

Nobody puts it on the list, and everybody notices once it is done. The before and after photo does the selling.

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Driveway Car Wash

Forty minutes, a bucket, and a customer who can see the problem from their front door.

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Young Founder

A program from Founder's Best Friend. Built for kids 8 to 18 who want something of their own.

Young Founder, 2026