Can FDM 3D printing make a functional prototype of an electronics enclosure?
Yes, FDM printing can deliver a functional electronics enclosure prototype. What it verifies, which material to choose, and how heat, IP rating and EMC fit in.
Yes, with conditions. FDM 3D printing is a common way to make a functional prototype of an electronics enclosure: you can check dimensions, board fit, connector cut-outs and snap-fits before paying for tooling. A prototype is not a certified product, though. Temperature resistance, flammability, IP rating and EMC are proved by testing the finished device, not by the printing itself.
Custom 3D printing of electronics enclosures is part of our prototype 3D printing. We print FDM only, in PLA, PETG, ASA, nylon and TPU, and in PC Blend on request.
What an FDM enclosure prototype verifies and what it does not
According to Protolabs Network (hubs.com), FDM is a fast, cheap method for prototypes where shape and assembly are being tested.
| An FDM prototype verifies | An FDM prototype cannot by itself |
|---|---|
| Board fit, standoffs, clearances to the edges | Prove an IP rating (the finished enclosure is tested to IEC 60529) |
| Cut-outs for connectors, buttons, LEDs and display | Prove the flammability class of the finished device |
| Alignment of the halves, snap-fits, screwing | Meet EMC requirements and earn CE marking (the device manufacturer's job) |
| The temperature inside, if you measure it at full load | Prove the continuous operating temperature of the material |
Material by temperature: PLA, PETG, ASA and PC Blend
The heat resistance quoted by Prusa Polymers is not a permitted operating temperature. For PETG, ASA and PC Blend it is the heat deflection temperature under load (HDT) to ISO 75 at 0.45 MPa (PETG, ASA, PC Blend). For PLA we could not find the definition of the figure in a technical data sheet.
| Material | Temperature (Prusa Polymers) | Suits an enclosure that... | Watch out |
|---|---|---|---|
| PLA | 55 °C | is only a prototype of shape and assembly | Above 60 °C Prusa says it loses strength, it is brittle, no heat source inside |
| PETG | 68 °C | is indoors, has a weak heat source and snaps or screws together | Measure the temperature inside, at least 4 perimeters for sealing |
| ASA | 93 °C | is outdoors or near heat and needs UV resistance | No flammability class stated, large parts can warp |
| PC Blend | 113 °C | sits next to a significant heat source (on request) | More demanding to print |
| TPU 95A | HDT 78.6 °C at 1.80 MPa | is a gasket, foot or protective part, not the shell | A gasket alone does not give an IP rating |
The Raspberry Pi 4 has an ambient operating temperature of 0 to 50 °C (product brief), and the Mean Well LRS-50 power supply an efficiency of 80 to 90 % (specification), so at 50 W output it loses roughly 6 to 12 W as heat (our calculation). Measure the temperature inside the closed enclosure at full load for several hours and compare it with the HDT. Filaments are compared more broadly in Which material to choose for 3D printing and Materials for end-use parts.
Is a 3D printed enclosure flame retardant?
Not automatically. The UL94 V-0 class exists for a single filament, Prusament PETG V0, which Prusa describes as the only UL-certified self-extinguishing PETG (Prusa). The UL Product iQ record ties it to conditions: wall thickness of 0.75 or 3.0 mm, 0.2 mm layers, a 0.4 mm nozzle, the “Balanced or default” profile and selected Original Prusa printers (for example MK3S+, MK4, XL, Core One). The record itself states that other print parameters may give significantly different results. It is a property of the material, not of every print or of the finished device. For ordinary PLA, PETG and ASA the manufacturer does not guarantee flammability.
PETG V0 is not on our list of materials and we do not promise any material with UL V-0. If the device needs a flame-retardant enclosure, for example when it is mains powered or needs certification, put it in the enquiry and we will handle it separately. Under our terms and conditions, 3D printed parts are not intended, without a separate written agreement, for uses where their failure could endanger life, health or property.
IP rating, EMC and CE: what the test of the finished device settles
IP rating
The IP code under IEC 60529 has two digits: the first (0 to 6) rates protection against dust and solid objects, the second (0 to 9) against water. IP54, IP65 and IP67 are three different tests, IP67 being immersion to 1 m for 30 minutes. A rating comes from testing a specific enclosure, not from a technology.
In Prusa's test with water-filled containers, leaks came mainly from seams and the transitions between infill and perimeters, not from the bond between layers. Prusa recommends at least 4 perimeters for PETG, PLA and nylon and at least 2 for ASA and PC. With thin walls the material matters, with thick ones (6 perimeters) it does not, and 100 % infill alone does not make a part watertight. It tests holding water, not an IP rating.
More perimeters, a TPU gasket and an O-ring groove help. We can design the sealing, but the finished device has to be tested for IP. We promise no IP rating.
EMC, shielding and CE
Plastic is an insulator and does not shield electromagnetic radiation (Machine Design). Shielding is added with conductive paint or plating, and joints must be electrically continuous. EMC and CE marking belong to the manufacturer of the finished device: Directive 2014/30/EU requires conformity assessment and the CE marking. The whole device is tested, not the enclosure alone.
Design rules, inserts and snap-fits
The numbers are recommendations from the sources, not a promise of print accuracy. A test piece sets the clearance: Protolabs Network gives 0.5 mm for FDM snap-fits, while the University of Florida guide for Prusa MK4 and XL printers gives 0.20 to 0.25 mm for ordinary sliding parts and 0.30 to 0.40 mm for loose lids. Fine-tune it in the first iteration.
| Rule | Value | Source |
|---|---|---|
| Enclosure wall thickness | at least 2 mm | Protolabs Network |
| Clearance around components | 0.5 mm, also between the board edge and the wall | All About Circuits |
| Port cut-outs | 2 mm of clearance in total, drill critical holes | Protolabs Network (as above) |
| Screw bosses | wall around the hole at least 1 hole diameter | Protolabs Network (as above) |
A screw driven straight into plastic holds poorly after a few disassemblies, so repeated screwing calls for brass heat-set inserts. According to CNC Kitchen, the soldering iron should be 10 to 20 °C hotter than the print temperature and the blind hole about 1 mm deeper than the insert. We fit inserts on request from 10 € per hour. For snap-fits, Protolabs Network says tough materials such as PETG or nylon suit FDM and PLA is brittle. Do not build cantilevers along the Z axis.
A 2 to 3 iteration plan and the inputs you need
Two to three iterations usually suffice, each takes typically 2 to 5 working days from the deposit being credited, plus time for your own testing. This is our recommended approach, not a statistic.
| Iteration | Material | What you verify | What to leave for later |
|---|---|---|---|
| 1. Shape and assembly | PLA or PETG | The real board fits, connectors, buttons, LEDs, display, standoffs, cable clearance, alignment of the halves, first snap | heat, IP, labels |
| 2. Target material | PETG, ASA or PC Blend | Temperature inside the closed enclosure at full load, ventilation, inserts, snap-fits, cable glands, labels, indicative sealing tests | certification |
| 3. Before a run (if needed) | target material | Changes from iteration 2, assembly procedure (order, tools, time), trial at the customer | changes without a reason |
What to send us:
- a 3D model of the board and components in STEP format from ECAD or MCAD (KiCad can export it), or at least a board drawing with outline, holes and component heights,
- a connector drawing: position and size of connectors, buttons, LEDs and display relative to the board edge,
- the physical board, because even the Raspberry Pi drawing is, according to the manufacturer, approximate,
- the environment, the highest temperature, the power that turns into heat, IP and flammability requirements, and the quantity.
A fuller list is in What documents do I need for a quote. If you do not have a model of the enclosure, 3D modelling can design it around the board.
Enclosure design checklist
- You have a STEP model of the board and components, and the board itself.
- The internal components are modelled together with the enclosure and checked for collisions.
- The wall is at least 2 mm, and for sealing PETG has at least 4 perimeters.
- The clearance around components and between the board and the wall is 0.5 mm.
- Clearances between parts (lid, rails) are chosen from a test piece.
- Ports have 2 mm of clearance in total and critical holes are drilled.
- Heat-set inserts are used wherever it will be screwed together repeatedly.
- Snap-fit features are in PETG or nylon, off the Z axis, with a radius at the root.
- The temperature inside is measured at full load and the material chosen from it.
- Ventilation is designed and does not conflict with the required IP rating.
- It is clear who will prove flame retardancy or the IP rating, if needed.
- The prototype is labelled as a prototype, not as a certified product.
When an FDM enclosure is not enough
| Situation | Why | What to do |
|---|---|---|
| IP67 and higher | A print has layers and seams, without measures and testing it is risky | Gasket, O-ring groove, test of the device |
| Temperature above 113 °C | Beyond PC Blend, only PA11 Carbon Fiber (190 °C, on request) remains in our range | Measure the real temperature, handle the choice separately |
| Thousands of pieces | An injection moulding tool costs, according to All About Circuits, in the order of tens of thousands of dollars and more | Comparison in FDM or injection moulding for a small run, we do not offer injection moulding |
| Cosmetic surface | Layers and support marks remain visible | Finishing on request |
| ESD and certification | Ordinary filaments are not ESD, and we do not have an ESD-safe material in our range | Say so in the enquiry |
What an enclosure prototype costs and how to start
A board enclosure weighing 60 g works out, by our price list, at 7.20 € (60 g × 0.12 € per gram), but the minimum order of 10 € is charged. A larger enclosure of 150 g comes to 18.00 €. Illustrative only, see The price of 3D printing. Each iteration is a separate print.
Send the STEP model of the board, the connector drawing and a description of the environment through the contact form, and we usually send a quote within 24 hours. Ordering pitfalls are covered in What to watch for when ordering a 3D printed prototype. Print parameters are on the FDM printing page, the service in prototype 3D printing.
Frequently asked questions
- Can FDM 3D printing make a functional prototype of an enclosure for an electronic device?
- Yes, FDM suits checking dimensions, board fit, connector cut-outs and snap-fits, because a revised model can be printed again within working days. It will not produce a certified finished product: temperature, flammability, IP rating and EMC have to be assessed on the finished device.
- Which material should I print an enclosure with a heat source in?
- According to the manufacturer Prusa Polymers, PLA has a heat resistance of 55 °C, PETG 68 °C, ASA 93 °C and PC Blend 113 °C. For PETG, ASA and PC Blend this is the heat deflection temperature under load (HDT to ISO 75), not a continuous operating temperature. In the prototype, measure the temperature inside the enclosure at full load and compare it with that figure.
- Is a 3D printed enclosure flame retardant?
- Not automatically. The UL94 V-0 class exists for the Prusament PETG V0 filament and applies to wall thicknesses of 0.75 and 3.0 mm and to specific print settings on Prusa printers, as the UL record states. For ordinary PLA, PETG and ASA the manufacturer does not guarantee flammability. If a device needs a flame-retardant enclosure, say so in the enquiry so it can be handled separately.
- Can an FDM enclosure have an IP65 or IP67 rating?
- An IP rating comes from testing the finished enclosure to IEC 60529, not from the way it is made, so FDM does not guarantee it by itself. Layers and seams in a print can let water through, which is why more perimeters, a TPU gasket or an O-ring groove are used. At IP67 (immersion to 1 m for 30 minutes) and above, FDM without further measures and testing is a risky choice.
- Do 3D printed enclosures shield electromagnetic interference, and does an enclosure need CE marking?
- No, plastic is an insulator and does not shield interference, but shielding can be added with conductive paint on the inside. EMC testing and CE marking are the job of the manufacturer of the finished device under Directive 2014/30/EU. A prototype enclosure on its own is not a certified product.
- How many iterations and what documents does an enclosure prototype need?
- Two to three iterations usually suffice, and each takes typically 2 to 5 working days from the deposit being credited. The most useful inputs are a 3D model of the board in STEP format, a board drawing with connector positions, details of the environment and of the power that turns into heat inside the enclosure, and ideally the physical board.
This article was prepared by the 3D tlač na zákazku editorial team with the help of AI tools. Every text goes through expert and editorial review, the figures are verified against the sources cited in the article, and we hold editorial responsibility for the published content. If you spot an inaccuracy, let us know.