Ốc Vặn Vòng Thêu Chắc Chắn

This is a remixed screw/bolt for https://www.printables.com/model/36510-embroidery-hoop-v2  Had some separation issues with the original print, so it broke when I tightened it. 

Instead of printing it again, with better layer adhesion, and an increase in the infill, I printed it flat, so its strong along the length.