Design for manufacturing in 3D printing: what it is and how to apply it.
Design for manufacturing (DFM) means designing a part already knowing how it will be produced. In FDM 3D printing it means choosing shapes, wall thicknesses and orientation that print well: the part costs less, comes out stronger and needs fewer corrections. It is how we work on every product design project.
Why it matters before printing
The same part, drawn two different ways, can take twice the print time and twice the supports. Fixing the model takes minutes; fixing a printed prototype takes a new print. DFM moves decisions to the start, when changing them is cheap.
Six rules for FDM 3D printing
The values below are indicative for a 0.4 mm nozzle and 0.2 mm layers; for each part we check them against the chosen material.
1. Solid, even walls. At least 1.2 mm for functional parts, ideally a multiple of the extrusion width. Walls that are too thin become fragile; very different thicknesses in one part create stress and warping.
2. Overhangs within 45 degrees. Surfaces inclined up to about 45 degrees print without supports. Beyond that, supports lengthen the print and leave marks. A fillet or chamfer often removes them.
3. Orientation that follows the loads. An FDM part is stronger along the layers than between them. A bracket under bending should be oriented so the layers do not split under load.
4. Holes and joints with clearance. Holes tend to come out slightly smaller than drawn. For clearance fits, leave 0.2 to 0.3 mm between parts and add 0.1 to 0.2 mm to hole diameters; precision holes can be reamed after printing.
5. Fillets instead of sharp corners. Internal sharp corners concentrate stress and are the first place a part cracks. Even a small fillet makes the part stronger and easier to print.
6. Split the part when it helps. A large or complex part sometimes prints better in two pieces, joined with interlocks, screws or threaded inserts. It saves supports and gives each piece a better orientation.
DFM for prototypes and for production
When the prototype is the first step towards moulding or machining, DFM also looks at the final process: draft angles, mould-friendly wall thickness, undercuts to avoid. 3D printing a part already designed for production lets you test it without redrawing it later. This is the work we do in prototyping.
How to apply it to your project
- If you already have a model, send us the STEP file: we check it and tell you what is worth changing before printing. For formats, read our guide on which file to send.
- If you start from an idea, we design the part with these rules from the start.
- To choose the material for the use, see our materials page; to see how the design affects the price, read how much a prototype costs.
Frequently asked questions
Is DFM useful for a single prototype?
Yes. Even on one part it cuts print time, supports and the risk of having to reprint.
Can you modify a model made by our engineering team?
Yes, ideally from the STEP file. We show you every proposed change and apply it only after your approval.
What is the minimum wall thickness you can print?
It depends on material and use. For a functional part we recommend at least 1.2 mm; thinner cosmetic details are possible but stay fragile.
Is a 3D printed part as strong as an injection moulded one?
Generally not, especially between layers. With the right orientation, walls and material, it still handles many functional uses, assembly tests and small batches.
Does DFM increase the quote?
No: it is part of the check we do on every file. If the model needs major redesign, we show it in the quote before starting.
Tell us about the part you need.
Attach the file if you have one, or describe the part with photos and measurements. We reply within 24 working hours with a quote or the technical questions we need answered.
Request a quote