Exploiting nozzle geometry to predict resolution in extrusion-based bioprinting: mathematical modelling of a power-law fluid

Extrusion-based additive manufacturing is a popular technique used in the fabrication of three-dimensional constructs. Owing to the non-linear manner in which process parameters impact resolution and printability, the optimal combination remains platform- and material-specific. This study proposes a user-friendly, adaptable model to predict the diameter of a printed line of material through extrusion-based bioprinting. Exploiting the geometry of an arbitrary, axisymmetric nozzle, and assuming a power-law fluid, the model generated determines a relationship between the printed filament diameter and the pressure drop, nozzle travel speed, nozzle geometry, and material flow properties. Employing the model prior to printing enables engineers to restrict process parameter space and minimise the dependence on the current print-and-test methodology before an optimal combination of process parameters is determined. Two materials (a poly(vinyl alcohol)-based hydrogel and Nivea Crème), two temper..., , , # Research data supporting \"Exploiting nozzle geometry to predict resolution in extrusion-based bioprinting: mathematical modelling of a power-law fluid\"

[https://doi.org/10.5061/dryad.866t1g21x](https://doi.org/10.5061/dryad.866t1g21x)

## Description of the data and file structure

Data is stored as CSV files (PVA_25G.csv, NC_25G.csv, NC_22G.csv, NC_20G.csv) and code stored as MATLAB Code (.m) (where its Optimisation, Statistics and Machine Learning, and Bioinformatics Toolboxes are used). Users should ensure all files (data and code) are in the same folder upon use.

### File naming

Each CSV file contains print diameter measurements for one material and one nozzle geometry.

The **materials** include:

* A poly(vinyl alcohol)-based (**PVA**) hydrogel, or
* Nivea Crème (**NC**)

The **nozzle geometries** include:

* **25G** (0.00025 m)
* **22G** (0.00041 m), or
* **20G** (0.00058 m)

There are four data sets, PVA with a 25G conical nozzle and NC with either a 25G, 22G, or a 20G coni...,