I have a somewhat unusual bolt. The threads are M8, but the hex head is not standard. This still worked for me enough when I resized the X/Y scale down a bit, then drilled out the hole to widen it. I then needed pliers to press it onto the bolt. Next time I'll print it with more walls, but it seems like it might hold up fine anyway. Printed on P1S with Bambu PLA Basic. Thanks!