Influence of post-processing treatment on the surface roughness of polyamide PA12 samples manufactured using additive methods in the context of the production of orthoses

Additive techniques are gaining popularity, primarily due to the emergence of new 3D printing methods, advancements in 3D printers, and the availability of innovative materials. Models produced using additive processes can undergo additional post-processing and dyeing to modify their functional and visual properties. This article presents the results of surface roughness tests conducted on samples made of polyamide PA12, using the Selective Laser Sintering (SLS) and HP MultiJet Fusion (MJF) methods. Regarding the processing methods, chemical surface treatment contributed to reducing Ra and Rz parameters by about 80% for both analyzed printing methods, while mechanical surface treatment resulted in a reduction of approximately 40% for SLS samples and 30% for MJF samples. On the other hand, dyeing and applying an antibacterial coating did not significantly affect the Ra and Rz parameter values. Considering the obtained results, the recommended manufacturing method for orthosis is the MJF method, and the finishing process should include mechanical treatment followed by dyeing.