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This study explores the use of whey powder in Selective Laser Sintering (SLS) to create porous carbon parts. Whey powder, heated at 150°C, forms solid parts due to melanoidin formation from lactose and whey proteins. Carbonized whey parts maintain their shape with controlled shrinkage, allowing for precise printing with high porosity and mechanical strength. A video demonstrating the process, as well as STL files for printed artifacts, are provided.

A novel design of a catalytic stirrer that can only be manufactured by 3D printing techniques is proposed. The stirrer blades are meshed and permeable to fluids. The STL files required for printing these novel stirrers with 2, 3, or 6 blades can be downloaded here. Two groups of STL files are provided depending on the material to be printed, namely PLA or any other selected filament for FDM printing; or whey pastes or any other selected paste for DIW printing. G-code and 3MF files are also provided to print, either by FDM or DIW, stirrers with meshed blades of different infills, namely solid (non-meshed or 100% infill), 50% infill, and 35% infill. The meshed patterns are provided by the PrusaSlicer® Laminator, as detailed in the corresponding publication.

We have designed a lab made extruder for direct ink writing (DIW) to be incorporated into a conventional fused deposition modelling (FDM) 3D printer. The STP and STL files required for printing the different parts of such extruder can be downloaded here. Instructions for their assembly and functioning are detailed in the paper.

This document outlines the design and 3D printing process of a double-stacked Archimedean spiral in PLA, intended to serve as a sacrificial template in the fabrication of a continuous flow reactor made of porous carbon.