When the Part Doesn't Exist Anymore: How We Manufactured a Custom Replacement Component
Introduction
Every piece of equipment has a lifespan — but that lifespan is rarely determined by the equipment itself. More often, it ends the moment a single component fails and a replacement cannot be found.
This is a frustratingly common problem. Manufacturers discontinue product lines. Suppliers stop stocking spare parts. Import lead times stretch into weeks or months. And the default solution — replacing the entire unit — is expensive, wasteful, and often completely unnecessary.
At Printer Under The Stairs, we work with businesses and individuals across South Africa who face exactly this situation. When a replacement part is unavailable, we reverse engineer the original, design a functional equivalent, and manufacture it to specification. The result is a restored piece of equipment at a fraction of the cost of replacement.
This case study documents one such project: a custom replacement component for a ladder, designed and manufactured at our Durban facility.
The Challenge
A returning customer — someone we had previously assisted with a separate custom manufacturing project — contacted us with a straightforward problem. A ladder they relied on was missing a critical component. Without it, the ladder was unusable.
The customer had already explored the obvious options. The original replacement part was no longer available. The manufacturer offered no solution. The only alternative was purchasing an entirely new ladder at a cost of over R3,000.
For a single missing plastic component, that was not an acceptable outcome.
The customer asked whether we could design and manufacture a replacement part instead. It was precisely the kind of problem we exist to solve.
The original metal ladder component provided as a reference for reverse engineering.
Reverse Engineering the Missing Component
Reverse engineering begins with the physical part itself. To measure accurately and recreate a component in CAD, we require the original part — even if it is broken or damaged. A broken original still carries the dimensional information we need: the geometry, wall thickness, hole positions, and profile that define how the part was made and how it must fit.
Where a component is a housing or enclosure, we also require the part it enclosed. The housing must fit around what it protects, and without that reference, accurate tolerancing is not possible.
In this project, the customer was able to provide the necessary reference. Using precise manual measurement, we recreated the component in CAD (computer-aided design) software — translating physical dimensions into a digital model that accurately reflects the geometry, fit, and function of the original part.
The goal at this stage is not simply to produce something that looks correct — it is to produce something that works correctly. Fit, function, and durability are the benchmarks, not aesthetics.
Once the CAD model was complete and reviewed against the ladder's specifications, we moved to material selection.
Choosing the Right Material
Material selection is one of the most consequential decisions in any custom manufacturing project. The wrong material — regardless of how accurate the design — will produce a component that fails prematurely or performs poorly in use.
For this application, we selected PETG (Polyethylene Terephthalate Glycol), a thermoplastic well suited to functional components that need to withstand real-world use.
PETG offers a practical combination of properties for this type of application:
- Impact resistance — it absorbs stress without becoming brittle
- Dimensional stability — it holds its shape under load and temperature variation
- Chemical resistance — it performs reliably in general-use environments
- Printability — it produces consistent, accurate results in production
Black PETG was selected as the material for this component. It is worth noting that the original ladder part was grey — so while the replacement matched the geometry and function of the original precisely, the colour differed. For a functional replacement, this was not a concern. The component fit correctly, performed as required, and restored the ladder to service. Colour matching is not always possible when manufacturing custom replacement parts, and we are transparent with customers about this from the outset.
Manufacturing the Replacement Part
With the CAD model finalised and the material confirmed, the component moved into production.
The part was manufactured to the dimensions established during the reverse engineering process. Tolerances were maintained throughout to ensure the component would fit correctly within the ladder's existing structure without modification to the ladder itself.
The finished component was inspected against the design specification before being delivered to the customer.
No special tooling, moulds, or minimum order quantities were required. This is one of the practical advantages of low-volume custom manufacturing: a single component can be produced to the same standard as a production run of thousands.
The Final Result
The replacement component fitted correctly, restored the ladder to full function, and required no modification to the ladder itself.
The customer avoided spending R3,000 on a new ladder. The existing equipment was returned to service. A functional product that would otherwise have been discarded continued its useful life.
That outcome — a problem solved, money saved, waste avoided — is the measure of a successful project. The manufacturing process that made it possible is simply the means to that end.
The finished replacement component, manufactured in black PETG at our Durban facility.
Why Reverse Engineering Can Extend the Life of Products
The ladder in this case study is one example of a challenge that affects businesses and individuals across every industry in South Africa.
Maintenance managers dealing with ageing plant and equipment. Procurement teams unable to source discontinued components. Facility managers facing the choice between expensive replacement and extended downtime. Tradespeople with tools or equipment that are otherwise in good working order.
In many of these situations, the underlying equipment is sound. The failure point is a single component — often a plastic part — that is no longer available through conventional supply channels.
Reverse engineering offers a practical alternative. By accurately measuring and recreating a component in CAD, and selecting an appropriate material for the application, it is frequently possible to manufacture a functional replacement that restores equipment to service at a cost well below that of full replacement.
This approach is not limited to ladders. The same process applies to brackets, housings, covers, clips, guides, bushings, handles, and countless other components across industrial, commercial, and domestic applications.
Printer Under The Stairs works with clients across South Africa — from individual homeowners to engineering firms and procurement departments — to provide custom replacement parts, reverse engineering services, and low-volume manufacturing solutions when standard supply chains cannot help.
Frequently Asked Questions
Do I need to provide the original part for reverse engineering?
Yes. To measure accurately and recreate a component, we require the original part — even if it is broken or damaged. A broken original still carries the dimensional information needed to recreate it. Where the component is a housing or enclosure, we will also need the part it enclosed in order to tolerance the replacement correctly.
Can you manufacture a replacement part if the original is badly damaged?
In many cases, yes. Provided enough of the original geometry remains to take accurate measurements, a damaged part can still serve as a sufficient reference. Each project is assessed individually before we commit to a quote.
Will the replacement part match the colour of the original?
Not always. Material availability and the manufacturing process mean that colour matching is not guaranteed. We are transparent about this from the outset. In most functional applications, colour is secondary to fit and performance — but if colour is important for your application, we will discuss available options during the quoting process.
What types of parts can be reverse engineered and manufactured?
We regularly work on plastic components including brackets, housings, covers, clips, guides, handles, and structural elements. If you have a component that is discontinued or unavailable, contact us to discuss whether a custom replacement is feasible.
Is custom manufacturing cost-effective for a single part?
It depends on the complexity of the component and the cost of the alternative. In many cases — particularly where the alternative is replacing an entire unit — a custom replacement part represents significant savings. We provide quotes before any work begins.
What is PETG and why is it used for functional parts?
PETG is a thermoplastic material commonly used for functional components that need to withstand impact, load, and general use. It offers good dimensional stability, chemical resistance, and durability, making it suitable for replacement parts in a wide range of applications.
How accurate are custom replacement parts?
Components are designed in CAD to the measured dimensions of the original part or the space it needs to occupy. Tolerances are maintained throughout the manufacturing process to ensure correct fit and function.
How long does a custom replacement part project take?
Timelines vary depending on the complexity of the design and the production requirements. Simple components can often be turned around quickly. We provide estimated timelines as part of the quoting process.
Do you work with businesses as well as individuals?
Yes. We work with maintenance managers, procurement teams, engineers, facility managers, tradespeople, and individual homeowners across South Africa. The process is the same regardless of the scale of the enquiry.
Can the same process be used for metal or other materials?
Our current manufacturing capability focuses on polymer components. If your application requires a material outside our current range, we will advise you accordingly during the assessment process.
Conclusion
This project is a straightforward example of what custom manufacturing makes possible. A ladder with a missing component. A replacement part that no longer existed in the supply chain. A customer facing an unnecessary R3,000 expense.
By reverse engineering the missing component, selecting an appropriate material, and manufacturing a functional replacement, we restored the ladder to service at a fraction of the cost of replacement.
Printer Under The Stairs provides custom replacement parts, reverse engineering, product design, and low-volume manufacturing services to businesses and individuals across South Africa, operating from our facility in Durban.
If you have a component that is discontinued, unavailable, or simply no longer made — we may be able to help.
Need a Custom Replacement Part?
If you are dealing with a discontinued component, a missing part, or equipment that cannot be repaired through conventional supply channels, contact Printer Under The Stairs to discuss your requirements.
We work with businesses and individuals across South Africa on custom replacement parts, reverse engineering, functional prototypes, product design, and low-volume manufacturing.
