Can 3D printing for engineers turn a single sample into a full run of 40 couplers and 40 nuts?
Yes. 3D Printing Express made 40 solid couplers and 40 matching nuts in white PETG for a UK engineering firm whose end user is rough on parts. A sample coupler came first, then a test pair that screwed together first time, and nothing was changed before the full run. Send STEP or STL files for an engineer-reviewed quote within 2 working hours; standard print lead time is 5 to 7 working days.
Who needed these couplers and nuts?
A UK engineering firm needed a plastic pipe coupler and a matching nut that screw together, joining two parts of a tube or pipe. The parts go to an end user, and the firm told us the end user would be hard on them, so both parts had to stay solid. We do not name the firm. What we can share is the brief: the right size, a nut that screws onto the coupler, and a batch of identical parts.
What did these 3D printed parts have to do?
The first files arrived about ten times too large. At that size the nut would have been 800 mm across. We spotted it and asked for the originals, and the client found and sent the original STEP files. The sizes then came right: 64 by 64 by 75 mm for the coupler and 80 by 80 by 25 mm for the nut.
The parts had three things to do. The coupler and nut had to screw together, with threads that mate. Both had to be solid all the way through, because the end user would be rough on them. And partway through, the order grew from one part to a coupler and a matching nut.
How did we make 40 matching couplers and nuts in solid PETG?
We used solid white PETG (Bright White) and printed both parts in solid 100% infill, which means solid all the way through. We also advised PETG over PLA, because PLA goes soft in a warm van or a sunny yard. The printed layers are visible, and that is normal for this process.
We did not go straight to the full run of 40 of each. A single sample coupler went in the post first. Then, because the client wanted to be sure the parts screwed together, we ran a test pair first: a coupler and a nut. They screwed together first time, and nothing was changed before we printed 40 of each. Late in the job a new batch of white PETG arrived. We phoned the client and sent photos of both spools, and the client chose the new batch, so all 40 of each are in it.
What did the client get?
The client received a batch of 40 couplers and 40 nuts, 80 parts in all, dispatched with tracking.
| As finished | First files | |
|---|---|---|
| Nut size | 80 by 80 by 25 mm | About 800 mm across, ten times too large |
| Coupler size | 64 by 64 by 75 mm | About ten times too large |
| Parts in the order | 40 couplers and 40 matching nuts | The coupler only, the nut was added later |
AI image made from photos of the real parts: all 40 couplers, nuts fitted, lined up on a workshop table. The image at the top of the page is made the same way.
GalleryFrom the project
2 images · 3D Printing Express, Bournemouth & Poole
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How did the job run, step by step?
Four steps, from the client's files to dispatch.
The files arrive
The client sent the files. The sizes were off, so we asked for the originals and worked from the right STEP files.
FilesSample, then test pair
A single sample coupler went first. Then, as the order grew from one part to two, a coupler and nut test pair, which screwed together first time.
FitPrint 40 of each, solid
We printed 40 couplers and 40 nuts in solid white PETG, 100% infill on both parts, in the new batch of white the client chose.
PrintDispatch
The batch went out with tracking.
Dispatch
Questions about this job
Plain answers from this job. For the wider service, see small batch production.
Can 3D printed PETG couplers cope with rough handling?
These were made for an end user who would be rough on them, which is why we printed both parts solid, 100% infill. We do not give a strength or load figure for them. If your part has a load in mind, tell us when you send the file.
Will a 3D printed nut screw onto a 3D printed coupler?
On this job, yes. At the client's request we printed a coupler and nut test pair first, and it screwed together first time. Nothing was changed before the full run of 40 of each.
Is 100% infill worth it for a 3D printed part?
It depends on the part. 100% infill uses more material and machine time than a lighter fill with extra walls, so it earns its place where a part will be handled roughly, which was the case here, or carries a real load. Parts that carry nothing, like guides and spacers, are often just as good lighter. Tell us what yours has to do and we will say which.
Who can 3D print a batch of solid PETG parts for engineers in the UK?
3D Printing Express can. This job was 40 solid white PETG couplers and 40 matching nuts for a UK engineering firm, made from the client's STEP files. Our workshops are in Bournemouth and Poole, Dorset, and Newbury.
Who has 3D Printing Express made solid PETG parts for?
A UK engineering firm: 40 solid white PETG couplers and 40 matching nuts, with a test pair first. We keep the client unnamed. More of our work is in our 3D printing case studies and the project gallery.
What do customers say about 3D Printing Express?
Our rating on Google is 4.9 from 50 reviews, and you can read them on our Google profile.
Need a batch of parts that screw together?
Send us your STEP or STL files and tell us how many you need. You get an engineer-reviewed quote within 2 working hours.