Introduction: Orthotic insoles are used to relieve pain and prevent foot deformities by influencing the biomechanics of the foot and redistributing plantar load. Traditional production of orthopaedic insoles involves time-consuming processes that generate waste and high material cost. Advanced technologies such as 3D printing allow for more efficient production by depositing material layer by layer, reducing waste and costs. Purpose: The purpose of the thesis is to identify the use of 3D technologies and 3D printing in the production of insoles by reviewing the professional and scientific literature. The objectives of the thesis are to find specialized software, if any, for the production of insoles, to identify what 3D printers are used for the production of orthopaedic insoles, to find materials used for 3D printing of orthopaedic insoles, and to identify the regulation and standards for 3D printed insoles. Methods: The literature was searched in the bibliographic databases Medline and ScienceDirect, and the bibliographic record search engines PubMed and Google Scholar were used. We included literature published between 2015 and 2025 that was freely available and peer-reviewed. We excluded sources that did not address the fabrication of orthopaedic insoles using 3D printing. Results: 26 articles were used in the literature review, all of them qualitatively describing the field. The majority of the studies reviewed described the field of 3D printing, with very few articles presenting research on 3D printing of orthopaedic insoles. Discussion and conclusion: The use of software in combination with 3D-printing represents a significant advance in the production of insoles, as it allows for greater precision, automation and faster production of customised insoles. Among 3D-printing technologies, layer fusion modelling is the most commonly used due to its low cost and accessibility, and selective laser sintering for more complex orthopaedic insoles. Thermoplastic polyurethane has been found to have the best properties for insoles due to its elasticity and durability. Despite many advantages such as reduced material consumption, flexibility and environmental performance, challenges remain related to the mechanical limitations of the materials, equipment costs and waste recycling.
Keywords: CAD, 3D printed inserts, materials for 3D printed inserts, g-code, additive manufacturing.
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