"3D printing service" is a crowded market. A Google search returns hundreds of options ranging from hobbyist print shops working out of garages to publicly-traded industrial bureaus running 500-machine farms. Most of them will print your file. Only some will deliver the part you actually needed on the timeline you actually promised. Here are the ten questions that separate reliable production partners from services that will burn you on the job that matters.
1. Where are they based — and where will your parts ship from?
"Domestic" services sometimes run offshore production behind the curtain. Before you commit, ask where the actual parts will be made. Offshore production adds 2–3 weeks to lead time, complicates QC, and creates customs and liability issues for many industries. For most teams, the right answer is a service that prints and ships from the US.
2. Who inspects your parts before shipping?
Ask: is every part inspected by a human before it leaves? By whom? What do they look for? Services that QC every part will have a clear answer. Services that do not will dodge the question. The correct answer includes dimensional check, surface finish check, and a pre-shipment photograph of every part.
3. What happens if a part is wrong?
Reprints are a fact of life in 3D printing — parts fail, files have issues, customers change their minds. What matters is how the service handles it. Ask: if I receive a defective part, how fast is the reprint? Who pays for the reprint? Is there a refund option? A reliable service has clear answers. A sketchy service says "we never have defects" — which is untrue for any service.
4. How long have they been printing your specific material?
Some services advertise 30 materials but only run 5 regularly. Parts in rarely-used materials fail more often and take longer because the machine settings are not dialed in. Ask how long they have been running the specific material you need. Six months minimum is a good threshold.
5. Do they offer design review?
File prep is where most 3D printing jobs fail. A good service reviews every incoming file for wall thickness, support strategy, orientation, and manufacturability issues before starting the print. They catch problems at upload, not on the build plate. A service that prints whatever you send without review will send you back whatever it prints.
6. What is their on-time delivery rate?
Ask for a number. Services that track their own performance will tell you (ours is 97%). Services that do not track it will tell you "we always deliver on time" — which is not a number, just a sales line.
7. Can you talk to a human?
You will need to call someone at some point. Maybe the part needs to change mid-job. Maybe you need a rush. Maybe the file has an issue. Who picks up? A dedicated service specialist is worth paying more for. An anonymous ticketing system is a red flag.
8. What technologies do they actually run in-house?
Some services advertise five technologies but run two in-house and broker the rest. Broker-routed jobs are slower, more expensive, and harder to QC. Ask: what do you run under your own roof? The answer tells you what kind of service you are really buying.
9. What is their capacity?
If you need 500 parts in a week, the service needs the production capacity to run them. Ask: how many parts per week do you produce? A desktop print shop running 5 machines cannot execute on a production order no matter how much they charge. We produce 5,000+ parts per week.
10. Can you see the facility?
The best check on any production vendor is to see the shop floor. A service that welcomes facility visits (by appointment) is confident in their operation. A service that hides the facility probably has something to hide. Brooklyn-area teams can visit our Brooklyn production floor any weekday by appointment.
The meta-question: what happens on the hard job?
All of these questions are really one question: what happens on the hard job — the one with the tight deadline, the revised file, the complex geometry, the customer freaking out? Services that answer all ten questions above will handle the hard job. Services that dodge the questions will fold when it matters most. Choose accordingly.
