# 3D printing for prototypes: test form, fit and function

> Use printed prototypes to answer the right questions early and compare design variants clearly.

Canonical: https://printimir.ch/en/guides/3d-printing-for-prototypes

## 3D printing for prototypes: test form, fit and function

A printed prototype makes dimensions, handling and assembly tangible before you invest time in more variants or larger quantities. Its value depends on the question it is meant to answer.

### Three kinds of prototype

- **Form model:** How does the part look, feel in the hand and proportion itself? A coarser layer height is often enough.
- **Fit model:** Does it fit its surroundings, and are holes and edges positioned correctly? Dimensional accuracy matters, so allow clearance.
- **Functional model:** Does a hinge hold, a clip engage or a mechanism run? Material and print orientation become important.

### Comparing variants

Add different files or configurations to the cart as separate items. You receive them in one order and can compare them side by side. Label variants in the file so they remain easy to distinguish.

### Materials for prototypes

PLA is usually sufficient for form and fit tests. Use PETG or PLA CF when a prototype must withstand real loads or warmth. A functional model made from the wrong material can lead to the wrong conclusion.

### From iteration to a small batch

Once a variant is settled, you can reorder it as a one-off part or discuss a small batch through the project request. For recurring identical parts, placing one higher-quantity order makes the quantity discount worthwhile.

### Frequently asked questions

#### How quickly can I receive a prototype?

With an existing file, a small order usually reaches you within 3 to 5 working days. Larger quantities and long print times take longer; the cart shows the expected delivery date.

#### Can I test one part first?

Yes. There is no minimum quantity.

#### Can I get support for a larger project?

Use the project request for quantities, deadlines or requirements that should be discussed first.

### Read next

[3D-printed prototypes](https://printimir.ch/en/3d-printed-prototypes) · [Small-batch 3D printing](https://printimir.ch/en/small-batch-3d-printing) · [3D printing for businesses](https://printimir.ch/en/3d-printing-for-businesses) · [All guides](https://printimir.ch/en/guides)

### Ready?

Upload your model and see the price instantly, or describe your project if you do not have a file yet.

[Upload model](https://printimir.ch/en/3d-printing/upload-model) · [Request a project](https://printimir.ch/en/3d-modeling/request)