Background 3D manufacturing is a newer technology that shows potential and has gained interest in the world of medical devices. It has been used to produce custom made foot orthotics (CFO)s, but little evidence on the biomechanical effects is available. The literature suggests that the 3D manufactured CFOs (3DMCFO) have comparable outcomes as conventional manufactured CFOs (CMCFO). Purpose The purpose of this pilot study was to investigate biomechanics and comfort in the 3D manufacturing method, because of the lack of biomechanical evidence in literature, and because comfortable orthotics are a prerequisite for an optimal foot orthosis. Methods This pilot project uses a randomized crossover study design to test if there is a difference in plantar pressure distribution and comfort between 3DMCFOs and CMCFOs on two participants (n=2). To investigate the plantar pressure distribution the F-scan® in-shoe sensors was used to measure peak plantar pressures. To evaluate comfort the Orthosis Comfort Score (OCS) was used. Result For both participants similar results of mean peak pressures could be seen in some areas in the two CFOs, where in other areas contradictory results were seen. The comfort in the two CFOs was similar. Conclusion Similarities was seen in plantar pressure distribution and comfort in the two CFOs in both participants. However, the validity and reliability are low because of the low number of participants. / Baggrund 3D print er en nyere produktionsmetode som viser potentiale og har vækket interesse inden for medicinske hjælpemidler. 3D printning er blevet brugt til at producere specialfremstillede fod ortoser (SFO), men der er lav evidens for dens biomekaniske effekt. Litteraturen viser at 3D printede SFOer har sammenlignelige resultater som konventionel produceret SFOer. Formål Formålet med dette projekt var at undersøge biomekanik og komfort for 3D- produktionsmetoden. Dette blev undersøgt fordi der er lidt evidens inden for området, og fordi komfort er en forudsætning for en optimal fod ortose. Metode Dette pilotstudie bruger et randomiseret kontrolleret studie design for at teste om der er en forskel imellem 3D produktionsmetoden og den konventionelle produktionsmetode når der kigges på trykfordeling og komfort i to deltagere (n=2). For at undersøge trykfordeling under foden bruges F- scan® indlæg-sensor, for komfort bruges The Orthosis Comfort Score. Resultat For begge deltagere var der overensstemmelser i de gennemsnitlige høje tryk og i komfort for begge SFOer, hvor der i nogen områder var uoverensstemmelser. Konklusion For de to SFOer, overensstemmelser kunne ses i trykfordelingen under foden og i komfort. Validiteten og pålideligheden for dette projekt er dog ikke højt på grund af det lave deltagerantal.