romulus as1x electronic enclosure design

Designing Around the Electronics

One of the most important parts of electronic enclosure engineering is establishing the relationship between the enclosure and the internal components.

The mechanical design may need to accommodate:

• PCBs

• connectors

• switches

• LEDs

• displays

• wiring

• terminals

• mounting hardware

• other electrical components

These elements influence the enclosure’s:

• overall size

• wall positions

• internal ribs

• bosses

• openings

• mounting points

• assembly direction

• part separation

Poor internal packaging can result in an enclosure that becomes unnecessarily large or difficult to assemble.

The internal architecture must therefore be developed together with the external product geometry.

Injection Molding DFM

Because the production housing was intended for injection molding, the enclosure components had to be developed around molding requirements rather than simply around appearance.

Important considerations included:

• controlled wall thickness

• draft

• ribs

• bosses

• internal support features

• parting strategy

• manufacturable internal geometry

• assembly features

• cosmetic surfaces

• tooling access

Electronic enclosures often contain many internal ribs, bosses and mounting features.

These features are useful mechanically, but poor geometry can cause manufacturing problems including:

• sink marks

• warpage

• difficult ejection

• unnecessary tooling complexity

• visible cosmetic defects

This means the mechanical requirements of the electronics must be balanced against the realities of injection molding.

For detailed injection molding principles, see:

Injection Molding Design Guidelines

From Product Design into Injection Mold Tooling

A significant part of this project was that Ben’s involvement did not end with the product CAD.

For the AS1X enclosure, Ben designed the complete injection mold tooling for the molded enclosure components.

This required translating the production part geometry into a tool capable of manufacturing the parts repeatedly.

This experience provides a practical connection between:

Product Geometry → DFM → Mold Construction → Molded Part

Understanding this relationship is valuable during product design because features that appear simple in CAD can create significant tooling consequences.

Examples include:

• undercuts

• parting geometry

• shut-offs

• deep features

• ejection requirements

• thin steel conditions

• internal bosses and ribs

• cosmetic parting lines

The AS1X project therefore provides direct experience on both sides of the tooling interface: designing the product and designing the mold used to produce it.

Why Tooling Knowledge Matters During Enclosure Design

An enclosure designer does not need to design the mold on every project.

However, understanding mold construction improves DFM decisions before the CAD is released to a toolmaker.

For example, tooling knowledge helps identify whether a product feature may require:

• a slider

• a lifter

• a more complex parting line

• additional inserts

• difficult ejection

• thin or weak steel conditions

• unnecessary mold complexity

Sometimes a relatively small product-design change can simplify the production tool substantially without changing the intended product function.

This is one reason tooling considerations should begin during product design rather than only after the product is sent for quotation.

Production-Ready CAD Is More Than a Finished 3D Model

A visually complete enclosure is not necessarily ready for production.

Production-ready enclosure development requires consideration of:

• manufacturable geometry

• assembly

• component fit

• tolerances

• fastening

• tooling

• cosmetic surfaces

• manufacturing variation

The mechanical design must remain practical when real parts are molded and real electronics are assembled.

For companies developing PCB-based products, the transition from prototype enclosure to production housing is often one of the most important stages of the development process.

A 3D-printed enclosure may prove the size, appearance and basic function of a product, but production injection molding introduces a different set of engineering constraints.

Prototype Enclosure vs Production Enclosure

A prototype enclosure may be optimized for:

• rapid manufacture

• easy design changes

• simple assembly

• low quantities

A production injection molded enclosure must also account for:

• tooling

• draft

• wall thickness

• ejection

• shrinkage

• molding variation

• cycle repeatability

• production assembly

• unit volume

Therefore, a prototype should not automatically be sent to an injection mold manufacturer without reviewing whether the geometry is appropriate for production.

This transition is a core part of:

Electronic Enclosure Design

What Does This Case Study Demonstrate?

Have you designed electronic enclosures that reached commercial production?

Yes.

The Romulus AS1X was developed as a production electronic product, with more than 5,000 units manufactured.

The work included product design, electronic enclosure development, internal component packaging and injection molding DFM.

Can you design a housing around a PCB and electronic components?

Yes.

Electronic enclosure development requires the internal components, mounting features, interfaces, fastening strategy and enclosure geometry to be developed as a complete system.

3DDFM’s Electronic Enclosure Design service focuses on this integration.

Electronic Enclosure Design Service

Do you have injection mold design experience?

Yes.

For the AS1X project, Ben Nel designed the complete injection mold tooling for the production enclosure.

This case study is evidence of that tooling experience.

Our current core service offering remains focused on product design, DFM and preparing products correctly for manufacturing.

Why is injection mold experience useful when designing plastic products?

Because the geometry of the product directly affects the complexity of the production tool.

Understanding tooling helps identify risks such as:

• undercuts

• difficult parting conditions

• ejection problems

• thin steel

• difficult shut-offs

• unnecessary tool actions

This can help improve product geometry before tooling begins.

For products preparing for injection molding, see:

Injection Molding Design Service

Can a 3D-printed electronic enclosure be converted to injection molding?

Often yes, but it should normally be redesigned or reviewed before production tooling is ordered.

Prototype geometry may contain:

• excessive wall thickness

• insufficient draft

• unsupported bosses

• geometry that cannot be molded

• fastening methods that do not scale well

• unrealistic tolerances

The production version should be engineered around the intended molding and assembly process.

Should the PCB or enclosure be designed first?

Ideally, they should be developed with continuous coordination between the electronics and mechanical design.

Critical electronic interfaces such as:

• PCB dimensions

• connector positions

• display positions

• buttons

• LEDs

• batteries

should be defined early.

The enclosure can then be developed around those constraints while allowing feedback between the electronics and mechanical design as the product evolves.

When should an electronic enclosure receive a DFM review?

Before significant money is committed to production tooling.

A DFM review can identify problems involving:

• molding

• internal component layout

• assembly

• tolerances

• fastening

• tooling complexity

• production feasibility

If your enclosure CAD already exists and you want it independently reviewed before tooling, see:

Design for Manufacturing Consulting

Electronic Enclosure Design Principles

Electronic enclosures require a balance between the internal electronics, user interfaces, mechanical requirements and manufacturing process.

Important areas include:

• PCB mounting

• component clearance

• fastening

• connector alignment

• wall thickness

• ribs and bosses

• sealing where required

• assembly sequence

• production method

For a detailed technical overview, see:

Electronic Enclosure Design Guide

The AS1X case study demonstrates how these principles can be applied to a real commercial electronic product that progressed into injection molded production.

Need an Electronic Enclosure Prepared for Production?

3DDFM supports companies developing PCB-based and electronic products that need production-ready mechanical housings.

Our work can include:

• enclosure architecture

• PCB and component packaging

• aesthetic product design

• fastening strategy

• Design for Assembly

• injection molding DFM

• production-ready CAD

• toolmaker interaction

• manufacturing review

Electronic Enclosure Design Service

Design for Manufacturing Consulting

More Production-Proven Engineering Case Studies

See additional manufacturing examples covering high-volume injection molded electrical products and production sheet metal engineering.

View Manufacturing Case Studies

High-Volume Injection Molding & DFM – Lesco Manufacturing

Sheet Metal Product Engineering & DFM – Turnstar Systems