This is a high strength functional modular pulley system. I printed all the plastic parts with 3d printer and they are PLA material. These provide mechanical advantage and with this design a total 8:1 force gain can be achieved. Since the design is modular, you can obtain mechanical advantage at different rates by using any number of rollers and blocks. I used 8 pulleys and 10 blocks in the design.

The pulleys were printed with a 90% fill rate and the blocks with a 50% fill rate. It looks pretty solid, but for high strength, I recommend printing with high filling ratios (90%-100%).

The M8 half thread used to attach the blocks together. The lengths of the half thread bolts are M8x50, M8x70, M8x90 and M8x110 mm. The thread length of the M8 half thread bolt is 22 mm.

I reached to the most efficient system with the triple tackle. (In other words, the pulley system providing a mechanical advantage at the ratio of 6:1) In fact, it is thought that the highest result will be obtained in the quadruple tackle (8:1) system. But frictions hinder the mechanical advantage we need to gain. Therefore, in the Quadruple tackle system, the motor did not lift any more force.


STL Files: https://www.thingiverse.com/thing:492...