i cant see the real life use for these because the bolts are melted to the screw if 3d printed. i'm new to 3d printing so i may be wrong but i dont think so. why every upload should have a 3-4 lines of text description. just to show a little bit of respect for those who stumble over your designs. like, not wasting their time on something that is not what they are looking for and save them a headache etc.