From Prototype to Small-Batch Production with FDM
When an FDM batch beats injection moulding, how to keep reorders consistent, checking a first article, bulk pricing and planning a production run.
Your prototype works. Now you need 20, 50 or 200 of them. For many parts, the next step is not an injection mould. It is a small batch printed on the same machines, to the same settings, as the prototype you already tested.
This guide covers when an FDM batch makes sense and when moulding wins, how to keep parts consistent across reorders, and what to plan before you commit to a run.
When an FDM Batch Makes Sense
FDM batches make sense when volumes are low, the design may still change, and you can't justify the cost and lead time of a mould. Small-batch printing is ideal for tens to a few hundred units.
| Factor | FDM small batch | Injection moulding |
|---|---|---|
| Upfront cost | None. You pay per part | Tooling is a large upfront investment |
| Time to first part | Days | Typically weeks to make and test a mould |
| Design changes | Edit the file and reprint | Changing the tool is slow and costly |
| Cost per part | Roughly flat, with quantity discounts | Very low once the tool is paid for |
| Best volume | Tens to a few hundred | Thousands and up |
| Surface | Visible layer lines | Smooth, moulded finish |
The crossover point depends on the part. A small, simple part may be worth moulding at a few thousand units. A large, complex part with low volumes may never be. A good habit is to print the pilot run, sell or test it, and only invest in tooling once the design has stopped changing.
Parts that suit an FDM batch
- Brackets, clips, spacers and mounts
- Enclosures and housings for electronics
- Jigs and fixtures for a production line
- Spare and replacement parts, printed on demand
- Pilot and launch runs before a mould is ordered
Parts that usually don't
- High volumes of small, simple parts, where moulding is far cheaper per piece
- Parts that need a smooth, glossy moulded surface straight off the tool
- Parts needing tolerances tighter than FDM's typical ±0.2–0.5 mm everywhere
- Food-contact items for commercial or long-term use, where moulding with certified materials is the safer route
Start With One Piece
Before printing a batch, order one piece first at the normal price. This first article is the part you measure, fit and test before committing to the run. It is the cheapest insurance you can buy.
Check your first article against a short list:
- Critical dimensions, measured against your drawing
- Fit with the mating parts, screws or PCB
- Strength in real use: drop it, load it, flex it
- Colour and surface, under the light it will be seen in
- Anything that took effort to assemble or would slow down a batch
If you can't check it in person, ask us for photos and a dimension check of the finished print before it leaves us. If something needs to change, edit the file and re-quote. Our free file check looks at wall thickness, tolerances, clearances, orientation and supports before printing, so most problems are flagged before the first print.
Keeping Every Batch Consistent
Consistency comes from changing as little as possible between runs. We print on a single printer family, and the settings we quote with are the settings we print with. Every piece in a batch is printed to the same settings on the same machines, so colour and dimensions stay consistent from the first unit to the last.
You can help keep reorders identical:
- Keep the same file. Reorder a paid job from your order page at today's price, as long as the model file is still on file. You don't need to re-upload or re-configure anything.
- Use the file library. Signing in with Google adds order history and a file library, so you can re-quote a part months later without digging for the file.
- Version your files. Put a version number in the file name (bracket-v3.step) and only change it when the design changes.
- Note the material and colour. Colour can vary slightly between filament batches, which is normal for FDM. If colour match matters across runs, tell us when you reorder.
Pricing a Batch
Quantity discounts apply automatically in your live quote as the number of copies grows, so you can see the per-unit price for different quantities straight away on the quote page. For larger runs or repeat orders, message us on Telegram to discuss a better rate. Batch printing many copies of the same model is more efficient, and we're happy to work out pricing for it.
Payment is a 50% PayNow deposit to start production, with the balance on completion, or 100% upfront. Companies and agencies can pay by purchase order, and we issue itemised quotations and invoices. We're registered on Vendors@Gov and SAP Ariba; see our business page.
Planning the Run
Timeline
Most orders are ready within 24–48 hours of approval, but larger batches depend on our live production queue. Share your deadline when you ask for a quote and we'll agree a realistic schedule with you upfront. If a date is tight, a rush surcharge may apply, always agreed before you pay. If we can't hit the date, we'll say so before you pay anything.
Assembly, labelling and packing
If your batch is made of several printed parts, we can assemble them. We can also label parts and pack and deliver the order straight to your own client. Tell us what you need when you ask for a quote, so it is priced in from the start.
Confidential designs
Many small-batch jobs are for startups with an unreleased product. We sign an NDA on request before you share your files.
Delivery
We deliver batches anywhere in Singapore, or you can collect free from our workshop in Woodlands.
If something is wrong
If any part in your order is wrong or defective, report it from your order page within 30 days of collection or delivery, with a photo if you can. We reprint it free, or refund you if a reprint won't put it right. The full policy is on our returns page.
A Simple Production Checklist
- Design frozen, with a version number in the file name
- Material chosen for the real use, not just the prototype
- One piece ordered first and checked against your drawing
- Critical dimensions written down and shared with us
- Quantity and deadline confirmed, with a schedule agreed upfront
- Assembly, labelling and packing needs listed on the quote request
- NDA signed if the design is confidential
- File kept on file for one-click reorders
For more on running short production with us, see small-batch manufacturing and bulk and batch printing.
Quick FAQ
How many parts can you print in one batch?
From a few dozen to several hundred identical parts, depending on size and material. For very large runs we agree a production schedule with you upfront.
Can I test one before ordering the batch?
Yes. Order one piece first at the normal price, check it, then order the rest.
Will a reorder in six months match the first batch?
We print on the same machines with the same settings, and reorders use your saved file. Slight colour variation between filament batches is normal for FDM, so tell us if colour match is critical.
When should I switch to injection moulding?
When the design has stopped changing and volumes reach the thousands. Until then, printing is usually faster to start and cheaper overall.
Ready to turn a prototype into a batch? Upload the file and compare prices across quantities. Get an instant quote.
