The crane boom design is based on that of a 3d printer; inspired by the prusas in the iForge. It uses a continuous servo and a rack and pinion to lift the boom. The design uses 3D printed bearings and bearing housings to locate the boom and allow sliding.
These pictures speak more than my words here:
![](https://cdn.hackaday.io/images/5667971553438996931.jpg)
![](https://cdn.hackaday.io/images/6487991553438996989.jpg)
![](https://cdn.hackaday.io/images/1687511553438998333.jpg)
![](https://cdn.hackaday.io/images/9758571553438998777.jpg)
![](https://cdn.hackaday.io/images/698371553438998771.jpg)
![](https://cdn.hackaday.io/images/5371091553438999256.jpg)
![](https://cdn.hackaday.io/images/8399911553438999739.jpg)
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