Designed for the 55x58mm Kester 1-lb solder spools. Prints in 2 files with 4 parts total. Beware: it will require some form of surface-mounting to avoid being dragged around a workbench. Duct tape, well-mounted and employed magnets or a screw through the base will do.Standard low settings should work. For the solder base, I suggest an extremely high infill, otherwise the shells won't always connect.