RC car wheel 12mm hex hub nut, custom heights[Edit] updated to work with the Customizer to adjust offset (part) height. I tested modifying the hex_height variable and everything works ok. You can modify other variables with the customizer too, but there's no restrictions so you could possibly break the model. Just check the Customizer's STL output in another viewer (like NetFabb) before slicing/printing. Designed this for a friend that wanted to adjust the offset of his wheels. Print without support. I've successfully printed with 0.25mm layers.