README file
Data Set Title: “Roughness on ironed specimens”
Data Set Author/s: Andrea Montalti (University of Bologna, Department of Industrial Engineering), ORCID ID 0009-0001-9623-1633; 
Data Set Contact Person/s: Andrea Montalti (University of Bologna, Department of Industrial Engineering), ORCID ID 0009-0001-9623-1633, andrea.montalti8@unibo.it; 

Data Set License: this data set is distributed under a CC BY 4.0
 
Publication Year: 2024
Data set Contents
The data set consists of:
•	one spreadsheet in .xlsx format
ironing_roughness_20240515.xlsx
•	one readme file in .rtf format
ironing_roughness_README_20240515.rtf
Data set Documentation
Abstract
The data set consists of surface roughness measurements of specimens made in additive manufacturing material extrusion post processed with a new ironing process. Ten roughness measurements were carried out on each specimen with parallel and perpendicular directions.
Content of the files: 
•	file ironing_roughness_20240515.xlsx contains roughness measures of the specimens.
From left side the specimens with temperature of the ironing and tip used, the measure and the mean.
On right side the mean and some plot to show the difference between non ironed and ironed specimens
Methodology
The specimens have a prismatic geometry with a square base (25x25x4mm), manufactured via the additive manufacturing process of fused deposition modelling (FDM) with an ironing process applied to the top surface to improve surface finish. Two tips were used: one with a fillet radius of 4.5mm (Tip 1) and one with a fillet radius of 9.6mm (Tip 2); both operated at a set temperature of 230°C (T_set). The specimens that did not undergo any ironing process are labelled as S0, those using Tip 1 are labelled as S1, and those using Tip 2 are labelled as S2.

For measurements, the Alpa metrology RT-10G instrument was used, which adheres to the ISO 4287 standard, with a cut-off wavelength (λc) set at 0.8mm and a sampling number of five (Nc=5). The instrument defines the length to be analysed as Lt = (Nc+1) * λc, thus Lt=4.8mm.

Each specimen was measured in both perpendicular and parallel directions; for the specimen without ironing, this refers to the infill direction of the last layer; for the specimens with ironing, it refers to the last direction of the tip pass.
“Cube” identifies the specimen without ironing. “ass9” is the abbreviation for assembly 9, which refers to the parameters inputted into the process G-code where the distance between passes is 1.0mm, similarly, “ass6 bis” where the distance between passes is 0.4mm.
For each specimen, ten measurements were taken in each direction, collecting values for the surface roughness parameters Ra, Rq, Rt, and Rp, as described below:

For each specimen, the mean values for surface roughness parameters Ra, Rq, Rt, and Rp are calculated. By averaging the roughness values of specimens subjected to the same treatment, mean values measured in the parallel and perpendicular directions are obtained (indicated on the right side of the spreadsheet). Subsequently, the average between perpendicular and parallel measurements is calculated, reported in the “Mean specimen” column, and finally, the roughness relative to the specimen without ironing is determined.
In conclusion, the graphs visually represent the analysed numerical values. The bar chart corresponds to the data in the “Mean” column (Q5 ÷ Q10), and the second chart refers to the data in the “Roughness respect S0” column (S5 ÷ S10).