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We present preliminary work optimising 3D printed porous triply periodic minimal surface (TPMS) structures, formed using Thermoplastic Polyurethane (TPU) elastomer with Fused Filament Fabrication (FFF). We examine the compressive properties of a Split P TPMS structure for changes in the unit cell porosity for a fixed unit cell size of 10mm. Preliminary results highlight opportunities to apply Split P TPMS structures made in TPU to mimic properties of medical grade foams typically found in diabetic foot orthotics, and through porosity adjustment, can be tailored across a greater range of compressive strengths. Such structures may find usefulness in creating a new generation of diabetic foot insoles whereby the compressive strength can be tailored to the unique loading conditions of the user.