---
title: "Rapid Prototyping Services | Fast Custom Parts | OpenSpindle"
description: "Get rapid prototyping quotes from independent shops. Compare 3D printing, CNC machining, and sheet metal for your fastest path to a real, functional part, with quotes in about 48 hours."
canonical: https://openspindle.com/manufacturing/rapid-prototyping
---

# Rapid prototyping from independent shops

The fastest path to a real, functional part. No tooling for most processes, quotes in about 48 hours, and parts in days. Upload your design and compare 3D printing, CNC, and sheet metal shops set up for fast turnarounds.

**1-3 days** first prototypes | **~48h** to a quote | **No tooling** for most processes

## The rapid prototyping loop

Prototyping is a loop, not a one-off: make a part, test it, refine the design, and go again. The faster each loop, the sooner you reach a design that is ready for production.

1. **Upload your CAD:** Send a 3D model or a sketch. We accept STEP, STL, and most common formats, or you can describe the part instead.
2. **Get matched and quoted:** We match your part to independent shops set up for the right process and send back a quote, usually within about 48 hours.
3. **Parts in days:** Most prototypes ship in roughly 1 to 10 days depending on the process, with no tooling to wait on.
4. **Test and iterate:** Test the part against your design goals, refine the model, and run the next loop, repeating until the design is locked.

## Which process for a fast prototype

| Process | Lead time | Volume | Why it fits |
| --- | --- | --- | --- |
| [3D Printing](https://openspindle.com/capabilities/3d-printing.md) | 1-3 days | 1-50 | No tooling and the cheapest way to iterate on a design. Handles complex geometry that other processes cannot. |
| [Resin (SLA / DLP)](https://openspindle.com/capabilities/resin-3d-printing.md) | 1-3 days | 1-25 | The finest cosmetic detail and the smoothest surfaces, good for look-and-feel models. |
| [CNC Machining](https://openspindle.com/capabilities/cnc-machining.md) | 3-10 days | 1-200 | Tight tolerance and real production materials, when the prototype has to behave like the final part. |
| [Sheet Metal](https://openspindle.com/capabilities/sheet-metal-fabrication.md) | 3-10 days | 1-100 | Flat and bracket prototypes cut and formed from real gauge material. |
| [Urethane Casting](https://openspindle.com/capabilities/urethane-casting.md) | 1-3 weeks | 10-200 | The molded look and feel of production, cast from a cheap silicone tool before you commit to steel. |

## Prototyping processes compared

| Approach | Best for | Lead time | Cost |
| --- | --- | --- | --- |
| [FDM / FFF](https://openspindle.com/capabilities/fdm-3d-printing.md) | Cheap concept models | 1-2 days | $ |
| [SLA resin](https://openspindle.com/capabilities/resin-3d-printing.md) | Cosmetic detail | 1-3 days | $$ |
| [SLS nylon](https://openspindle.com/capabilities/sls-3d-printing.md) | Functional parts | 3-5 days | $$ |
| [CNC](https://openspindle.com/capabilities/cnc-machining.md) | Production-grade material and tolerance | 3-10 days | $$$ |

## Match prototype fidelity to your stage

Not every prototype needs to look and work like the final part. Match the fidelity to the question you are answering and you iterate faster and cheaper.

| Stage | Fidelity | What it proves | Best process |
| --- | --- | --- | --- |
| Concept | Low | Basic size, shape, and ergonomics | FDM 3D printing |
| Design review | Low to medium | Form and fit with mating parts | FDM or SLA 3D printing |
| Functional test | High | Real loads, heat, and wear | CNC machining or SLS |
| Looks-like / market | High (cosmetic) | Appearance, color, and finish | SLA resin or urethane casting |

Low-fidelity prototypes are the cheapest and fastest; move to high fidelity only for the questions that actually need it.

## Which process for what you are testing

The fastest route depends on whether you are checking how a part looks, how it fits, or how it performs.

| You are testing | Best process | Typical lead time | Why |
| --- | --- | --- | --- |
| Form (does it look right) | FDM or SLA 3D printing | 1-3 days | Cheapest, fastest way to hold a physical model |
| Fit (does it assemble) | SLA or SLS 3D printing | 1-4 days | Tight enough tolerance to check mating parts |
| Function (does it perform) | CNC machining or SLS | 3-10 days | Real production material, strength, and tolerance |
| Looks and feel (production-like) | Urethane casting | 1-3 weeks | Molded surface finish and color in small batches |

Say which of these you are testing when you request a quote and shops recommend the fastest fit.

## Getting a prototype fast and right

- **Match the process to what you are testing:** A prototype for form (does it look right), fit (does it assemble), or function (does it perform) each favor a different process. Say which one you are testing when you request a quote.
- **Iterate cheap first, then validate in the real material:** Run early design loops in the fastest, cheapest process, then move your final design review to the actual production material and process before you commit to tooling.
- **Call out the one tolerance that actually matters:** Most prototypes do not need every dimension held tight. Flag the one or two features that are truly critical so the shop can quote and machine accordingly.
- **Prototype to de-risk tooling:** The job of a prototype is to catch form, fit, and function problems while they are still cheap to fix, before you commit to a mold or hard tool. Validate the final design in the real material first, then invest in production tooling with confidence.

## Prototyping shops on OpenSpindle

Real independent shops set up for fast-turn prototypes, from desktop 3D printing to full CNC machine shops that can turn a design around in days.

[Browse all 3D printing shops](https://openspindle.com/manufacturers?capability=3D%20printing)

## Frequently Asked Questions

### What is rapid prototyping?

Rapid prototyping is the fast production of a physical part, usually with little or no tooling, so you can test form, fit, or function early in a design. It covers processes like 3D printing, CNC machining, and sheet metal, chosen for speed rather than the lowest cost at volume.

### What is the fastest way to get a prototype?

3D printing is usually the fastest option since it needs no tooling and can produce a part directly from your CAD file, often in 1 to 3 days. For a part that needs to match your final material or hold a tight tolerance, CNC machining takes a bit longer but gets you a functional, production-grade prototype.

### How much does a prototype cost?

Cost depends heavily on the process, material, and quantity: a single 3D printed part can cost far less than a machined one, while CNC and sheet metal prototypes cost more per part but need no tooling investment. Upload your part to compare real quotes from independent shops rather than guessing at a number.

### Which process for a functional vs a visual prototype?

For a visual or fit-check model, 3D printing (especially resin for fine detail) is usually enough and is the cheapest, fastest option. For a functional prototype that has to survive real loads, heat, or wear, CNC machining in the actual production material gives you a more honest test.

### How do I move from prototype to production?

Once your design is validated, the next step depends on your target volume: low-volume production can often stay on CNC, sheet metal, or 3D printing, while higher volumes typically move to injection molding or another tooled process. See our low-volume production and on-demand manufacturing pages for the options in between.

## Related

- [Low-Volume Manufacturing](https://openspindle.com/manufacturing/low-volume-manufacturing.md)
- [On-Demand Manufacturing](https://openspindle.com/manufacturing/on-demand.md)

## Get prototype quotes

Upload your part once and get fast quotes from independent shops set up for rapid prototyping.