Xometry alternatives: how to choose a CNC supplier

Why engineers look for Xometry alternatives

Search "xometry alternatives reddit" and you find the same conversation repeated: an engineer got a quote, wonders whether it is the best they can do, and asks what else is out there. The honest answer is that there is no single "best" alternative. There are a handful of different business models for buying CNC parts, and each one is good at different things.

This page is written by 7DayParts, which is one of those options, so read it with that in mind. We have tried to describe every model fairly, including where ours is the wrong choice. We do not quote other companies' prices, lead times or policies here; those change, and you should check them directly. What does not change much is how each type of supplier is structured, and that structure predicts most of what you will experience.

The five types of CNC supplier

1. On-demand manufacturing marketplaces

Xometry and Hubs are the best-known examples of this model. You upload a CAD file to a website and get an instant, algorithm-generated price. The platform then routes your order to a shop in its network of partner manufacturers. The platform owns the customer relationship, the payment and usually the quality process; the partner shop owns the machines. The strength of the model is breadth and convenience: many processes and materials behind one login, with capacity spread over many shops. The trade-off is that you usually do not choose or talk to the shop that makes your part, and two orders of the same part may be made in different places.

2. Automated in-house factories

Protolabs is the best-known example. The company runs its own factories and has built heavily automated quoting and CAM around a defined set of design rules. Because the process is standardized, it can be very fast and very repeatable for parts that fit the rules. Parts outside the envelope (unusual tolerances, materials, or features the automation does not support) may need redesign or a different supplier.

3. China-based instant-quote platforms

Several China-based companies, some of them better known for PCBs or 3D printing, also offer CNC machining with instant online quotes. Their appeal is typically price on simple parts and the convenience of ordering several kinds of hardware in one place. As with any instant-quote system, the price reflects what the algorithm can see in the model; drawing requirements may be reviewed later or handled differently from platform to platform.

4. Direct, engineer-reviewed suppliers

This is the category 7DayParts is in. There is no instant price. An engineer reads your model and drawing, prices it, and sends DFM notes. The part is made in a specific partner shop and the supplier manages and inspects the order. It is slower to get a number than an instant quote, but the number already accounts for your drawing notes, threads, finishes and inspection needs.

5. Local machine shops

The job shop 20 minutes from your office. Quoting is by email, phone or a visit; capability ranges from a two-machine garage to a large aerospace supplier. Nothing beats a local shop for a same-week emergency, for parts you need to discuss over a bench, or for controlled work that cannot leave the country. In many high-cost regions, local shops are also the most expensive option for prototypes, and good ones often have long queues.

Xometry vs Protolabs: the model difference

People often compare Xometry and Protolabs as if they were the same kind of company. They are not, and the difference explains most of what users report.

A marketplace like Xometry is an intermediary: it prices your part, then finds a manufacturer in its network to make it. That gives it wide coverage of processes and materials, and its quality depends on how well it qualifies and manages those partner shops.

An automated factory like Protolabs makes parts in its own plants. Its quoting and machining are tightly integrated, which favors speed and consistency for designs that fit its rules, and limits flexibility for designs that do not.

So "Xometry vs Protolabs" is really "network vs factory". If your part is unusual, the network may have a shop that can make it. If your part fits the rules and you need it fast, the factory model is built for that. Neither is a direct substitute for a supplier where a person reads your drawing before pricing it, and neither is a substitute for a local shop when the part has to be on your desk tomorrow.

Where 7DayParts fits, and where it doesn't

We are a direct supplier. You send STEP and PDF files; an engineer reviews them and replies within 12 hours with a price for your quantities and DFM notes on anything that drives cost or risk. Parts are made in partner machine shops in China, typically in 7 days or less (expedited in 3–4 days), then inspected by our team and shipped by DHL, FedEx or UPS express in about 3–5 days. Every order includes first-article approval by photos and measurements, and an inspection report on critical dimensions. Standard tolerance is ±0.03 mm, tighter on critical features when called out and confirmed in the quote. If parts are out of tolerance against the approved drawing, we remake them free.

When we are the wrong choice

• You need parts tomorrow. Even expedited production plus express shipping is about a week door to door. Use a local shop.
• You want a price in 30 seconds. We do not have an instant quote; a person reviews every file, which takes up to 12 hours.
• The part is ITAR, export-controlled or weapons-related. We do not accept it. Use a domestic supplier registered for that work.
• You need a specific quality certification on the supplier. Check that any supplier you choose holds what your program requires.
• You are ordering many thousands of parts. We cover prototypes to about 1,000 pieces; high-volume production is a different sourcing exercise.

When we are a good fit

• Machined prototypes with real tolerances, threads and finishes, where you want someone to read the drawing.
• Low-volume runs of 10 to 1,000 parts, repeated with the same process as the approved prototype.
• Parts combining milling, turning, sheet metal and finishing such as anodizing in one order.
• Teams in high-cost regions who can plan around roughly two weeks from file to delivery.

More detail on how we work with Chinese partner shops is on CNC machining in China.

Decision checklist: choosing a CNC supplier

Work through these in order. The first "must" you hit usually decides the supplier type; then compare individual suppliers within that type.

How to run a fair comparison

1. Send identical packages. Same STEP, same PDF drawing, same quantities. Our file preparation guide has a checklist.
2. Compare landed cost. Part price + shipping + duties and taxes + payment fees. A DDP quote makes this easier.
3. Compare door-to-door time, not production time alone.
4. Check what was actually quoted. Did the price include your thread classes, finish, masking and inspection report, or only the geometry?
5. Ask what happens on a nonconformance and who decides whether a part is out of tolerance.
6. Order a small first batch and measure it yourself before committing a larger run.

For what drives the price differences you will see, read how much CNC machining costs; for setting tolerances that every supplier type can hold economically, see CNC machining tolerances.