8 Questions to Ask a 3D CAD Modeling Service

Most guides on hiring a CAD or 3D modeling firm list questions that every vendor answers the same way. Asking whether a shop is experienced or uses modern software tells you nothing, because nobody says no.

These eight are different. Each one has an answer that meaningfully varies between firms, and each one has a wrong answer worth walking away from. Our own answers are included, so you can see what we think good looks like and hold us to it.

1. Do you also manufacture parts?

This changes every piece of advice you receive. A firm that owns machines has a reason to steer your design toward the machines it owns. A firm that molds parts will find reasons your part should be molded.

Neither is dishonest, but it is a bias you should know about before you take design advice.

CADmore: no. We design and engineer only. Production runs through your manufacturer or our partner network, which is exactly why the recommendation can be whatever is actually best for the part.

2. Who is doing the modeling, and where do they sit?

Plenty of firms broker the work. You talk to a salesperson, the modeling happens through a marketplace or an offshore subcontractor, and nobody in the chain has responsibility for whether the file works.

Ask directly whether the person modeling your part works for the company, and whether you can reach an engineer rather than an account manager when something is wrong.

CADmore: our own engineering team, and you deal with an engineer.

3. What exactly do I get at the end?

"A CAD file" is not a deliverable. A mesh converted to a solid is technically a CAD file and is nearly useless for manufacturing, because there are no editable features and no dimensions to hold.

Ask for the specific formats, whether the model is parametric and editable, and whether drawings with dimensions and tolerances are included. If a shop is going to quote from it, you need the drawing.

CADmore: native CAD plus neutral formats like STEP, editable, with drawings when the part is going to be made.

4. What happens when the first version is wrong?

It sometimes will be, and how a firm handles that separates the good ones. The answers to avoid are the vague ones, either unlimited free revisions (which gets priced in somewhere) or silence about what a change costs.

Ask what counts as an in-scope adjustment and what triggers a new quote.

CADmore: minor in-scope tweaks are on us; larger revisions are quoted before we do them.

5. Can you tell me the price and the timeline before I commit?

Hourly-rate answers with no ceiling are how small projects turn into large invoices. You should be able to get a number and a date in writing, in advance, for a defined scope.

CADmore: every project is quoted before work starts. Short-range scanning starts at $260, design work typically delivers in 6 to 8 business days, and scanning with reverse engineering typically runs 8 to 10.

6. What do you need from me to start?

A good firm can tell you immediately, and the list should be short. A firm that needs a fully specified brief before it will engage is a firm that will struggle with real projects, because most real projects start with a part, a sketch, or a rough idea.

CADmore: whatever you have. A physical part, photos, a PDF, a napkin sketch, or an existing file that needs changing. If something is missing, we say so before quoting rather than after.

7. Will you tell me if something is not going to work?

This is the question most worth asking and the hardest to verify from a website. You want a firm that flags a problem before taking your money, not one that delivers what you asked for and lets you discover the issue at the shop.

Ask for an example of a time they told a customer something could not be done as requested.

CADmore: one recent scanning project had a hand-finished textured region we doubted could be cleanly parametric modeled. We said so in writing, with an image of the area, before quoting. Then we delivered it. Thirteen months later, that file runs the customer's product line. The full case study is here.

8. Where can I see the work in progress?

Long email chains are where projects go quiet. Ask how you will know what is happening, and whether files, messages, quotes, and invoices live somewhere you can check without asking.

CADmore: every project runs through our portal, so progress, files, messages, and invoices are in one place.

How to use these

You do not need all eight. Questions 1, 3, and 7 separate firms fastest: who they are aligned with, what you actually receive, and whether they will tell you the truth when the answer is inconvenient.

If you want to put these to us, send what you have and we will answer them against your actual project rather than in the abstract.