Project Circleg is a low-cost prosthetic leg system designed for the needs and circumstances of amputees in less developed countries. By using recycled plastic waste in combination with simple production methods, the Circleg prosthesis can be produced locally and cost-effectively.

What it makes unique


Project Circleg is design driven and therefore developed according to the needs and circumstances of the users.


Project Circleg uses recycled plastic waste in combination with simple production methods in order to produce locally and cost-effective.


Project Circleg’s system is designed to work in a material cycle. This enables a lasting preservation of value of the Circleg prosthesis.

high functionality


The adapters at foot and knee joint enable the individual adjustment to the user.


A mechanism incorporated in the knee joint swings the leg forward while walking in order to prevent dangerous trip hazards.

Protection cap

The polycentric knee joint is equipped with a protection cap, which allows a kneeling position and protects the joint from dirt.

Ankle joint

The ankle joint allows a squatting position and therefore the use of a squat toilet.

Modularity & Customizability

The Circleg prosthesis is designed to be fully modular in order to repair or exchange broken parts. In addition it also allows the individual colour design of the leg prosthesis and therefore the possibility for the users to express themselves through the Circleg.


Why Project Circleg is needed

high demand

35 million people in the world need prostheses or orthoses.

World Health Organisation

The demand for low-cost leg prosthesis is high in many «less developed countries» (LDCs) and the existing prosthetic systems lack in terms of functionality, affordability and availability. Not beeing able to walk has a huge influence on physical, psycological, economical and social aspects. Many amputees are excluded from society and are not able to get a job and gain an income for their families.

Valuable Resource

72% of the worldwide yearly produced plastic packaging ends up in landfills or nature.

Ellen McArthur Foundation: The New Plastics Economy

Such landfills are often found in less developed countries (LDCs), due to the lack of official recycling systems. As industrial designers we are driven by the notion of using plastic waste as a resource for meaningful products. Therefore the Circleg prosthesis is made of recycled polypropylene (PP) post-consumer plastic waste, which cuts the material costs down to 50%. It is reinforced with glass fibres to create a composite material that meets the high-performance requirements of a leg prosthesis.

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We are Fabian Engel and Simon Oschwald, the founders of Project Circleg. As industrial designers we are driven by the notion to have an impact with our skills. We truly believe that Project Circleg gets better when it is discussed from various perspectives. So get in touch with us! We are keen to get to know your ideas and opinions.


Swiss Student Sustainability Challenge 2018
Winner of the SSSC 2018

Nomination for Progress Prize 2018
Top 10 at the Global Grad Show 2018 in Dubai

Falling Walls Lab Zurich 2018
Winner of the Falling Walls Lab Zurich 2018

James Dyson Award 2018
Switzerlands Winner of the James Dyson Award 2018

Award for Excellent Business Pitch
University of Zurich Innovators Camp 2018

Student Award 2018
Department Design at the Zurich University of the Arts

Young Researcher Award 2018
Institute for Design Research at the Zurich University of the Arts

  • We had the pleasure to talk with @martinafuchscnn and Aimée van der Wolde from seif about social entrepreneurship in Switzerland. Check it out! Link in bio ⬆️ @cnnmoneyswitzerland 
#projectcircleg #socialimpactbusiness #cnnmoneyswitzerland
  • What an inspiring evening full of good, sustainable and impactful ideas. A great end of a very successful impact academy. Big thank you to Seif for the last few month 🙌🏻 #pitchingevent #seif #impactacademy #bigup #thankyou #projectcircleg
  • The last few weeks were crazy! A lot happened and we are busy planning the next steps. Some good news are in the line. Stay tuned! 📷 by amazing @whereshadowsfall! 
#socialdesign #socialimpact #industrialdesign #ateliersponti #news #planning
  • Planning the next phase. Exciting times ahead! 
#projectcircleg #socialdesign #planning #strategy #design #circulareconomy #2019
  • What a great honor to be featured on @dezeen! Go and have a read. Link in bio. 
#honored #thanks #dezeen #projectcircleg #prosthetic #legs #recycled #plastic #waste #follow
  • The Red Bull Basement Festival on Saturday was a blast! Many thanks for the good conversations, contacts, inputs and your helpful feedback! Big up to all those who visited us at Kraftwerk. Follow our journey and stay updated. 
@redbullswitzerland @redbullamaphiko @impacthubzurich 
#redbull #basementfestival #tech4good #projectcircleg #exhibition #thanks #greatday #followus
  • Preparations for the upcoming Red Bull Basement Festival at Kraftwerk Zurich. We‘re excited to present Project Circleg in a new way! Stay tuned and come by!

@redbull @impacthubzurich 
#techforgood #basement #festival #preparations #kraftwerk #exibition #projectcircleg
  • All on one leg! Find out more on Zett online, the magazine of the Zurich University of the Arts (@zhdkcampus). Link in bio. 📸 by Regula Bearth

#newarticle #zett #magazine #online #thanks #projectcircleg #ononeleg #zhdk #industrialdesign

supported by

Wissenschaft.Bewegen Gebert Rüf Stiftung

«This project is directly touching the life of disabled people in Kenya. We really need it and we very much welcome you.»

Thadius Mogendi, Chairman of the Lake Naivasha Disability Environmental Group