Design files for Otto, the Franz diffusion cell autosampling robot

The Franz diffusion cell (FDC) is a standard laboratory apparatus used for measuring drug absorption across the skin. It is usually operated manually. These files pertain to the development of Otto, an aftermarket FDC autosampler designed to be retrofitted to generic FDCs, to automate them. The files include computer-aided design (CAD) files for 3D-printable parts in FCSTD format, ready-to-slice 3MF and STL files for 3D printing, and videos showing Otto in operation. Also included is OttoMate, a browser-based companion app used to programme Otto. 3D models (.fcstd) were created in FreeCAD [https://freecad.org] and exported to .3mf or .stl for slicing. The font used in the front cover of the dispenser assembly is Nuixyber Pro Original Regular, available at https://www.1001fonts.com/nuixyber-pro-original-font.html PTFE-clip-R4-75scaled.stl is a 75% scaled model of PTFE-clip-R4.stl, available at https://www.printables.com/model/531604-mmu3-printable-parts/files. Licensed under GPL-2.0 [https://www.gnu.org/licenses/old-licenses/gpl-2.0.html] pursuant to upstream licence. frame-z-limit-switch-bracket.fcstd is a remix of Z limit switch bracket.step, available at https://github.com/CrealityOfficial/Ender-3. Licensed under GPL-3.0 [https://www.gnu.org/licenses/old-licenses/gpl-3.0.html], pursuant to upstream licence. Change log: 2025-12-18: Updated OttoMate to include machine-specific presets for calibrated positions and optimised movements (shortened travel time). Added 3D-Printable-Parts-List.pdf. Added refiller-plunger-lock-a.fcstd to fcstd.zip (it was omitted in error previously).Franz扩散池（Franz diffusion cell, FDC）是用于测定药物经皮吸收的标准实验室装置，通常采用手动操作。本数据集相关内容围绕Otto的开发展开：Otto是一款可改装至通用型FDC的加装式自动进样器，用于实现FDC的自动化操作。所提供的文件包括：适用于3D打印的FCSTD格式计算机辅助设计（CAD）文件、可直接用于切片的3MF与STL格式3D打印文件，以及展示Otto运行流程的演示视频。此外还包含配套网页端应用OttoMate，用于对Otto进行编程配置。 3D模型（.fcstd格式）由FreeCAD [https://freecad.org] 创建，并导出为.3mf或.stl格式以供切片处理。 分配器组件前盖所使用的字体为Nuixyber Pro Original Regular，可从https://www.1001fonts.com/nuixyber-pro-original-font.html 获取。 PTFE-clip-R4-75scaled.stl是PTFE-clip-R4.stl的75%缩放版本，原模型可从https://www.printables.com/model/531604-mmu3-printable-parts/files 获取，依据上游授权协议采用通用公共许可证第2.0版（GPL-2.0） [https://www.gnu.org/licenses/old-licenses/gpl-2.0.html] 许可。 frame-z-limit-switch-bracket.fcstd是Z限位开关支架.step的衍生修改版，原模型可从https://github.com/CrealityOfficial/Ender-3 获取，依据上游授权协议采用通用公共许可证第3.0版（GPL-3.0） [https://www.gnu.org/licenses/old-licenses/gpl-3.0.html] 许可。 更新日志： 2025-12-18：更新OttoMate，新增针对校准位置的设备专属预设参数与优化后的运动路径（缩短运行耗时）；新增《3D打印零件清单.pdf》；修正此前遗漏的refiller-plunger-lock-a.fcstd文件，将其补充至fcstd.zip压缩包中。