Usually, you should send one clearly named current file as the quote target, then attach older or alternate versions only when they add real context.
Buyers get into trouble when they send a folder full of near-identical files and expect the shop to figure out which one is current, which one is obsolete, and which one is only there for reference. That is how a quote ends up tied to the wrong revision, the wrong units, or a geometry version you already moved past.
There is nothing wrong with sending more than one file version. The problem is sending several without assigning each one a job.
Fast route:
- Send one approved quote target when you already know which file should be priced.
- Include an older or alternate version only if it explains a fit change, geometry difference, or revision question the shop actually needs to see.
- Label every extra file as current, previous, reference only, or do not quote.
- Request a quote here when the current file and notes are clean enough for pricing.
If your file package is still messy, pair this page with the main quote-prep guide, the file-change guide, and the CAD cleanup responsibility page.
Why too many unlabeled versions create quote risk
A shop can only price what it believes is the intended part. If the folder has final.stl, final2.stl, final-use-this-one.stl, and a STEP file with a different date, the quote is already carrying avoidable ambiguity.
That ambiguity shows up in several ways:
- the wrong geometry gets priced
- a superseded dimension still drives the estimate
- someone quotes the mesh while the buyer expected the newer CAD version to control
- older reference files quietly conflict with the current production intent
Once that happens, the problem is not really the quote. The problem is the file handoff.
When it makes sense to send more than one version
Multiple versions can help when they answer a real question instead of creating a guessing game.
| Situation | Why more than one file may help |
|---|---|
| Recent fit change | The shop may need to compare the old and new geometry to understand what changed and whether the quote should be refreshed. |
| STEP plus STL handoff | One file may be better for editable review while the other reflects the exact mesh already being used internally. |
| Reference-only legacy part | An older version can help explain the design lineage as long as it is clearly marked as not the current quote target. |
| Buyer still deciding between two real options | The shop can sometimes quote option A versus option B if the request says these are deliberate alternatives rather than accidental duplicates. |
When you should send only one file
If the job is already defined and the only goal is to price the current part, one clearly named file is usually the best move. That keeps the quote tied to a single target and reduces the chance that the shop spends time sorting old versions instead of pricing the work.
This matters most for straightforward repeat jobs, replacement parts with one approved geometry version, and simple prototype requests where alternate versions add no real value.
How to label the files so the shop does not guess
The easiest fix is to assign each file a role. Do not make the shop infer it from timestamps or naming chaos.
- Current quote target: the file that should actually be priced
- Previous revision: older version for comparison only
- Reference only: context, but not the file to manufacture
- Alternate option: a deliberate second path that may need separate pricing
- Superseded: do not quote or produce from this file
A short note in the email or quote form usually matters more than fancy file naming by itself.
A simple note that prevents most mistakes
Please quote REV-C STEP as the current file. The REV-B STL is attached for reference only so you can see the older clip geometry. Do not quote or produce from REV-B. If the change from REV-B to REV-C meaningfully affects price or lead time, please flag that in the quote.
That tells the shop exactly what each file is doing in the conversation.
What if the current file is not fully approved yet?
Then say that too. If the latest revision is still under review, the quote should usually be treated as provisional. That is especially true when the geometry change may affect fit, supports, labor, wall thickness, or packaging flow.
If the file is still moving, use the revision-rounds guide and the separate prototype vs production quote page so pricing does not harden around a part that is still changing.
Frequently Asked Questions
Can I send both STEP and STL for the same part?
Yes. That often helps, as long as you say which one is the current controlling version and whether they should match exactly.
Should I include old revisions if they are not being quoted?
Only when they provide useful context. If they add no value, leave them out. If you do include them, label them clearly as reference only or superseded.
What if I want pricing on two real design options?
That is fine, but say they are deliberate alternatives. Otherwise the shop may think you accidentally sent duplicate versions of the same part.
Is file naming enough on its own?
Not always. File naming helps, but one plain sentence that says which file should be quoted is even more important.
Related reading
- What to Send for a Custom 3D Printing Quote
- What Happens If You Change the File After a 3D Printing Quote?
- Should You Send STEP, STL, or 3MF for a Custom 3D Printing Quote?
- How Many Revisions Are Normal Before a Custom 3D Printing Quote Becomes Final?
- Who Is Responsible for CAD Cleanup Before a Custom 3D Printing Quote?
- Who Should Mark the Controlling File in a Shared Folder for a Custom 3D Printing Quote?
Simple takeaway
Send one clearly named file as the current quote target. Add older or alternate versions only when they help explain a real design, fit, or revision question. The more clearly you label each extra file, the less likely the shop is to quote the wrong part.
If you are ready to price the current revision, get a quote here. If you need broader help sorting the handoff, revisions, or production readiness, JC Print Farm can help.