Simple print core holder Ultimaker 3 Ultimaker S3 Ultimaker S5

thingiverse

There were many print core holders floating around but they were quite awkward to print. This one stands out because it doesn't rely on support material and prints in one piece, utilizing the core's spring mechanism to clamp each one firmly in place between the heat break and plastic shield. It's designed for eight separate cores. I have included a STEP file for anyone interested in making modifications. I printed mine with Ultimaker PLA using a 0.8mm nozzle with a 0.4mm layer height, sliced in Ultimaker Cura. TL;DR - Holds eight cores - Works on UM3 and UMS5 - No supports or post-processing needed - No glue or screws required, hooks onto the side of the frame UPDATE: I designed a smaller variant that holds four cores. The fins/legs are positioned inward to prevent sagging.