From Prototype to Product

Iterating

1. Print a quick, low-quality prototype to check size and fit.
2. Test with real use (and real users).
3. Refine the design, print again, measure again.
4. Freeze the design and production profile when it passes.

Version your files (holder_v1.3.step) and keep notes on what changed and why.

When to outsource

Printing services (online print bureaus) offer industrial technologies (SLS nylon, MJF, metal) and large volumes. Prototype at home; outsource materials or quantities your printers cannot handle well. For thousands of units, injection moulding may become cheaper than printing.

Protecting and respecting designs

• Only sell prints of designs you created or have a commercial licence for. Many shared models on repositories are non-commercial.
• Avoid trademarked characters and logos.
• Keep dated design files as evidence of your original work.

Testing like a customer

Before selling, use the product the way buyers will: drop it from desk height, leave it in a warm car or a sunny window (PLA softens), load it beyond its expected weight and check it after a week of daily use. Write down the limits you find and put the honest ones in the listing.

Final project

Take a product idea from sketch to sellable item: a CAD design for printing without supports, three documented prototype iterations, a locked production profile, a cost calculation with failure margin, a QC checklist and photos ready for listing (continue in Selling 3D Prints Online).

Check yourself

• Why print a rough prototype first?
• When is outsourcing better than printing at home?
• Why check licences on downloaded models before selling prints?