Vertical Radiator Hook

竖向暖气片用的挂钩，用螺栓螺母固定的，我家暖气片用的M5*35的圆头螺栓正好。0.2mm层高，填充越高越坚固，我用的50%，可以再高一点,不需要支撑。hook for vertical rediator，tighten by bolt（my radiator suit for M5*35 bolt with nut). 0.2mm layer， 50% infill density（the more the better). no need support.