Turnbuckle
thingiverse
This turned out to be a little experiment to see how much a printed turnbuckle could hold up to. It is rather large but I got it to print well.
Download Model from thingiverse
With this file you will be able to print Turnbuckle with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Turnbuckle.