A look at one of the most consequential engineering inventions to emerge from Africa in recent years, and the mind behind it
March 21, 2024: Every generation of technological progress produces a small number of inventions that matter not because they are the most complex or the most expensive, but because they solve the right problem at the right time for the people who need them most. The Dual-Function Rapid Prototyping System (DF-RPS) 2-in-1 3D Printer and Laser PCB Plotter, developed by Ethiopian engineer Trueye Tafese, belongs to that category. It is an invention that engineering educators, industrial operators, and innovators across Ethiopia have recognized as filling a gap that the field had accepted as unavoidable, and it has done so through original engineering that departed fundamentally from the design philosophy that had governed integrated manufacturing systems until its arrival. This article examines that invention, the problem it solved, the engineering behind it, and the engineer who built it, because both deserve to be understood clearly.
It is also worth stating at the outset that this machine is not Ms. Tafese’s first invention, nor is it the first evidence of her standing as an engineer. She has built AI-powered systems, worked on cybersecurity tools at a level of technical depth that few engineers in any context reach, contributed to telecommunications infrastructure at one of East Africa’s most consequential companies, and demonstrated across her career a range of technical capability that spans software, hardware, embedded systems, and applied artificial intelligence. She is recognized within Ethiopia’s engineering and innovation community not as a promising newcomer but as an established technical contributor whose work has repeatedly produced results with real-world consequence. The machine described in this article is her most widely adopted contribution to date, and it is the one that has most directly shaped the educational and professional experience of a generation of African engineers. But it should be understood as the most visible output of a body of work that reflects a consistently high standard of engineering across multiple domains.
This article is also, in a broader sense, an opportunity to celebrate the kind of mind that Africa produces and that the world does not always see clearly: rigorously trained, contextually intelligent, and capable of solving problems that well-resourced institutions in high-income countries have not thought to address because those problems do not affect them. Ms. Tafese is not exceptional because she succeeded despite her context. She is exceptional because she understood her context deeply enough to engineer a solution that no one else had built, and because the quality of that engineering has been validated by independent institutions that evaluated it on its merits. That is the standard by which brilliant engineering minds should be recognized, and it is the standard her work meets.
Across much of sub-Saharan Africa, engineering education has long carried a contradiction at its core. Universities train students in circuit design, embedded systems, mechanical modeling, and product development, equipping them with technical knowledge that is, in principle, competitive with engineering education anywhere in the world. Yet a significant proportion of those students graduate without ever physically producing the systems they design. The limitation is not intellectual. It is infrastructural, and it has persisted for long enough that many institutions and educators have come to treat it as an unavoidable feature of engineering education in resource-constrained environments rather than a solvable problem.
The root of that limitation is access to production equipment. Commercial 3D printers and PCB plotters are rarely manufactured locally across sub-Saharan Africa and must be imported at costs that place them beyond the reach of most universities, innovation hubs, and small industrial operators. Also the average $5,000 on the international market, a price point that places them beyond the reach of most universities and local innovators. A student who can design a circuit board on screen has no way to etch it locally. A student who can model a device enclosure in CAD has no way to print it within the institution where they study. The consequence is an engineering education that teaches design without delivering the practical experience of building, and that gap between conceptual and applied engineering competence has real downstream consequences for the quality of technical talent that African institutions produce.
Even where institutions could afford to import digital fabrication systems, a second structural problem emerged. The available commercial technologies were designed for operational environments fundamentally different from African educational and industrial realities: supply chains that assume reliable access to international procurement, maintenance ecosystems that presuppose technical support infrastructure, and price points calibrated to institutions with hardware budgets an order of magnitude larger than those typical of African universities. Beyond cost, the design architecture of existing dual-function systems created practical inefficiencies that made them poorly suited to high-frequency use in workshop and training environments. Conventional dual-function manufacturing platforms achieve their multi-mode capability through interchangeable tool heads, requiring operators to physically remove and replace components when switching between additive manufacturing and PCB plotting or engraving functions. In settings where both manufacturing operations are needed within the same session, that physical reconfiguration introduces workflow interruption, positional misalignment risk between successive operations, repeated recalibration requirements, and accelerated mechanical wear from frequent component swapping. The result was that even institutions that could afford to import commercial dual-function systems found them operationally impractical for the intensive, multi-function workshop use that engineering education and hardware prototyping programs require.
The machine delivers a set of capabilities that, prior to its development, had not previously coexisted within a single accessible platform designed for African educational and industrial deployment. It produces three-dimensional physical objects from digital models through Fused Deposition Modeling based additive manufacturing, enabling the production of mechanical components, device enclosures, prototype assemblies, architectural models, and engineering parts across a wide range of disciplines. It etches circuit board traces onto PCB substrates through laser-based plotting, allowing students, researchers, and innovators to produce functional prototype circuit boards locally without relying on external fabrication services that often involve long lead times, transportation costs, and significant expense.
By combining PCB fabrication and 3D printing within a single locally deployable platform, the machine significantly reduced the barriers associated with engineering prototyping. Instead of outsourcing fabrication activities, institutions could design, manufacture, test, and refine prototypes within their own facilities. Development cycles that previously required weeks of waiting for external production could be completed in substantially shorter periods, allowing students and innovators to iterate designs more rapidly and at a fraction of the previous cost. The result was not merely greater convenience but a meaningful expansion of practical engineering capability.
It is within this precisely defined problem space that Tafese’s DF-RPS 2 in 1 3D printer and PCB Plotter becomes profoundly significant. Spearheading the project, Tafese developed custom mathematical modeling and mechanical design algorithms to create a unified kinematic unit. Her system mounts the Fused Deposition Modeling (FDM) print head, laser module, and inductive sensing components simultaneously on a single carriage. The machine transitions between additive manufacturing (plastic fabrication) and subtractive manufacturing (copper PCB etching) entirely through firmware-level control, with high precision and no hardware reconfiguration required. Crucially, the system can be produced for just $1,500, a dramatic reduction from the $5,000 market standard.
The real-world impact of the DF-RPS has been transformative and immediate. At Addis Ababa University’s School of Engineering, 12 units are currently in operation. For the first time, computer engineering students can input Gerber files and etch working circuit boards in-house, while architecture students utilize the 3D printing capabilities to bring physical structural models to life.These systems have continuously supported multiple graduating cohorts, allowing hundreds of future innovators to physically manufacture their own functional prototypes before entering the professional workforce.
Beyond the university level, the technology has empowered professionals in robotics, manufacturing, and embedded systems who previously lacked local production infrastructure. 18 units are currently driving agile hardware development at INFNOVA Technologies. In INFNOVA,across recent cohorts, 320 students have now trained directly on the machine, allowing them to physically manufacture their own functional prototypes and grasp advanced manufacturing concepts before even entering university.
The machine achieves these outcomes through simultaneous multi-tool mounting, with the 3D print head, laser module, and inductive sensing components all installed on a single custom-fabricated carriage at the same time. Transitions between manufacturing modes occur entirely through firmware-level control, with no hardware reconfiguration required. A single inductive proximity sensor provides auto-bed leveling across both manufacturing modes without a separate calibration sequence for each, and the entire system is built from locally sourceable and internationally procurable components specifically selected for accessibility within African manufacturing and procurement conditions.
Perhaps most importantly, the machine contributed to the development of local engineering ecosystems. Every prototype produced internally represented experience gained by students, researchers, and innovators. Every project completed without outsourcing strengthened institutional self-sufficiency. Every student trained using the system acquired practical fabrication skills that would otherwise have been difficult to obtain. The cumulative effect extends beyond any individual university or innovation center. It is reflected in the growth of engineering capability, technical confidence, and manufacturing readiness among the communities the machine was designed to serve.
Trueye Tafese is the engineer who built this machine. She holds a Bachelor of Science in Software Engineering and is pursuing a Master of Science in Cybersecurity, and her professional background spans telecommunications, AI systems, embedded systems development, and applied manufacturing innovation. At Orange Digital Center, she developed an AI-powered waste sorting system using TensorFlow Lite and trained custom image-classification models capable of detecting plastic waste in real time. Her cybersecurity work has included reverse engineering malware binaries to uncover system calls and behavioral patterns. Earlier in her career, she contributed to software requirement development and device tracking systems at Safaricom Telecommunications, one of East Africa’s largest and most influential telecommunications companies. Her technical range is genuinely broad, spanning software systems, cybersecurity, AI, and embedded hardware, and it is that breadth that enabled her to approach the design of this machine as an integrated engineering problem rather than a discipline-specific one. The machine is her most widely adopted invention, but it is the product of an engineering career that had already demonstrated, across multiple domains and contexts, the kind of technical depth that produces contributions worth noticing.
Africa has always produced brilliant engineers, scientists, and inventors. What it has often lacked is the infrastructure to recognize, document, and amplify their contributions in ways that give those contributions the international visibility they deserve. Ms. Tafese’s machine is an invention that merits that visibility: technically original, practically significant, and validated by the communities it was designed to serve. As digital fabrication, embedded systems, and hardware innovation continue to grow in importance to engineering practice globally, the significance of a system that makes those capabilities accessible within African educational and industrial environments will only increase. She built that system before the field recognized it was needed, and the evidence of its impact is already visible in the institutions and the generation of engineers it has shaped.
