Adjustable link
thingiverse
You need to screw things together but need to be able to adjust the distance, here is a solution to that problem. Customize bolt size, width, length and thickness.
Download Model from thingiverse
With this file you will be able to print Adjustable link 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 Adjustable link.