Knobs, based on: M3, M4, M5, M6, M8, M10 normal nuts and lock-nuts (they are a bit higher). After trying them I decided to make two versions of them: a loose fit (the nut can be pressed by hand in the knob) and a tight fit (the nut has to be pressed or hammered in the knob). The M4 knob is made for the CraftBot buildplate. I have printed them with Kisslicer, 0.3mm layer height, 5 loops, 2mm skin thickness, 33% infill. They are designed to be printed without support structure. The knobs have little "snappers" at the bottom, to prevent the nuts to fall out , after hammering / drive them in the knob. Scale / adjust the inset parameter of Kisslicer to fit your specific printer needs.