contour transfer tool tightening clamp printed in pla without soports. print as many as you need and connect them with connecting pin look pictures. 0.4 dia nozzle 0.2 layer height 0.4 layer width 50 mm /s speed print as meany as you want rail plates and connect them with pin all so 3d printed but print all the connection elements pin, washers and clamp with 0.1 layer height 0.3 layer width and slower speed because the parts are very small. licensed under Creative Commons Attribution-NonCommercial 4.0 International Public License