Bendicho Lavilla, CarlosDíaz Tomé, VictoriaSeoane Viaño, IriaLuzardo Álvarez, Asteria MaríaOtero Espinar, Francisco Javier2024-09-252024-09-252024-05-23International Journal of Pharmaceutics 659 (2024) 1242560378-5173http://hdl.handle.net/10347/34869Diffusion cells play a crucial role in the pharmaceutical and cosmetic fields by assessing the release and permeation of active pharmaceutical ingredients across membranes. However, commercially available glass-based devices, such as Franz diffusion cells, are expensive and fragile. The emergence of three-dimensional (3D) printing technology enables the creation of diffusion cells with cost-effective polymeric materials and resins, offering exceptional precision and custom geometries. Nonetheless, there are challenges associated with interactions between 3D printing materials and drug molecules. This work aimed to develop inert coatings for 3D-printed diffusion models. Diffusion devices were designed and 3D-printed with a stereolithography (SLA) 3D printer, and different coatings were applied. Then, two model drugs were used to evaluate drug retention by coated devices. Among the tested coatings, one of them showed great potential in preventing drug retention and was selected for subsequent experiments with different drugs and conditions. Finally, voriconazole eyedrops were used to confirm the viability of 3D-printed Franz diffusion cells as a drug release diffusion model. The favourable results obtained with the coating promote the use of 3D printing as a cost-effective manufacturing technology, capable of producing diffusion cells tailored to specific study requirementsengAttribution-NonCommercial-NoDerivatives 4.0 Internacional© 2024 The Author(s). Published by Elsevier B.V. This article is available under the Creative Commons CC-BY-NC-ND licensehttp://creativecommons.org/licenses/by-nc-nd/4.0/Stereolithography (SLA) 3D printingDrug retentionFranz diffusion cellsIn vitro release testsInert coatingsjournal article10.1016/j.ijpharm.2024.1242561873-3476open access