Devices printed in 3Dresyns photopolymers for ESRF crystallography and spectroscopy

Dimensional fidelity and its consequences for flow exposure and optical alignment Printed photopolymers can influence a scientific measurement through the geometry and stability of the device surrounding the sample. This analytical technical note examines two published applications at the European Synchrotron Radiation Facility involving 3Dresyn MF RTP1 and 3Dresyn UHF, then develops an analytical framework for translating dimensional deviations into changes in sample exposure. For a rigid channel whose width and height are scaled by a common factor s at unchanged length, the nominal transit time scales as s² at fixed volumetric flow. At fixed total pressure, it instead scales as (1 − f)s² + fs⁻², where f is the fraction of the original circuit resistance contributed by the changing channel. Under the model assumptions, a 5% enlargement increases transit time by 10.25% at fixed flow, the control mode reported for 3D-MiXD. A hypothetical circuit operated at fixed pressure across the channel instead gives a 9.30% decrease. A rectangular duct calculation extends the analysis to unequal dimensional changes. A separate Gaussian illumination model relates positioning error in a stationary holder to local excitation fluence. These calculations provide conditional tolerance criteria and an experimental validation plan. They do not constitute measurements of either resin, a reconstruction of the complete published instruments, or a prediction of absolute radiation dose. The contribution is an explicit connection between manufacturing fidelity, operating conditions and measurement error that can be tested in subsequent experiments. The accompanying reproducibility supplement provides the analytical code,deterministic outputs, figures, manuscript sources and reference register.