---
title: "How to Find a Machine Shop for Custom Parts (2026)"
description: "Four ways to find a machine shop for custom parts, from directories and instant-quote marketplaces to concierge sourcing, plus how to vet one and what to send."
canonical: https://openspindle.com/compare/how-to-find-a-machine-shop
---

# How to Find a Machine Shop for Custom Parts

The four main ways to find a machine shop for a custom part, how each works, how to vet a shop, and what to send for an accurate quote.

There are four main ways to find a machine shop for a custom part: online supplier directories, instant-quote marketplaces, concierge sourcing services, and local search or referrals. The right one depends on how much time you have, whether you want to manage the shops yourself, and how many parts you are sourcing. Here is how each works, plus how to vet a shop and what to send for an accurate quote.

## Comparison

| Method | Who does the work | Speed | Best for |
| --- | --- | --- | --- |
| Concierge (OpenSpindle) | The service sources shops for you | Quote in ~48h | Handing off sourcing, whole-BOM, startups |
| Instant marketplace | You upload; an algorithm prices | Instant | One part, fast |
| Directory (Thomasnet) | You search and contact each supplier | Days of outreach | Discovery and vetting |
| Local / referral | You find and vet the shop yourself | Days to weeks | A direct local relationship |

## Online supplier directories

Directories like Thomasnet (owned by Xometry) let you browse and filter hundreds of thousands of suppliers, then contact or send a request for information to each one yourself. They are strong for discovery and vetting because you can see a shop's capabilities, certifications, and location. The trade-off is that you do the outreach, quoting, and comparison, which can take days for a single part.

## Instant-quote marketplaces

Marketplaces like Xometry, Protolabs Network, and Geomiq let you upload a CAD file and get an instant algorithmic price. This is the fastest way to price a single part. You do not choose the shop, and the price carries a marketplace margin, so it is not always the lowest. Great for a quick number early in a design.

## Concierge sourcing

A concierge service like OpenSpindle does the legwork for you. You post one RFQ with your requirements and a budget, and a person sources the right shops across a network and returns a best-match quote, kept under your budget. It can quote a whole bill of materials at once, source hardware, and put a dedicated contact on the project. You skip the outreach and coordination entirely.

## Local search and referrals

Google Maps, trade associations, and word of mouth are good for building a direct local relationship. The trade-off is speed: it is slow to find, compare, and vet enough shops to be confident you have the right capability and a fair price, especially for a specialized part.

## How to vet a machine shop

Match the shop's machines and processes to your part (milling, turning, 5-axis, Swiss, tolerance capability), check the quality system (ISO 9001, or AS9100 for aerospace and ISO 13485 for medical), review past work and ratings, confirm lead time, and ask whether they will provide inspection reports or material certs if you need them.

## What to send for an accurate quote

A 3D CAD model (STEP or Parasolid) plus a dimensioned 2D drawing with tolerances is ideal. Include the material and finish, the quantity, and any critical features, GD&T callouts, or inspection requirements. Even a STEP file and a print get you real numbers instead of ballparks. If you do not have a CAD file, a sketch or a clear description is enough to get started.

## Frequently asked questions

### How do I find a machine shop for a custom part?

Use a supplier directory to discover and vet shops, an instant-quote marketplace for a fast price on one part, or a concierge service like OpenSpindle to have the sourcing done for you and a whole bill of materials quoted under a budget.

### What is the fastest way to get a machine shop quote?

An instant-quote marketplace gives a price in seconds for a single part. For a sourced best-match quote from a specific shop, matched to your priorities, OpenSpindle returns one in about 48 hours.

### How do I vet a machine shop?

Match capabilities to your part, check the quality system (ISO 9001, or AS9100 for aerospace), review past work and ratings, and confirm lead time and whether they provide inspection or material certs.

### Do I need a CAD file to get a quote?

A CAD model plus a drawing gives the most accurate quote, but you can also describe the project. OpenSpindle accepts a drawing, a sketch, or a plain description to get started.

### Should I use a local shop or an online service?

A local shop is good for a hands-on relationship. An online marketplace or concierge service reaches more shops and compares options faster, which matters for capability match and price, especially on specialized parts.