Last week I printed al the Art3 Parts.
First I had to cut the GT2 belt to length. I used the Art2 body parts as a mounting template.
![](https://cdn.hackaday.io/images/7297431504432621141.png)
After a few tries the pulley was having the right length.
![](https://cdn.hackaday.io/images/1585331504432639685.png)
Now it was time to mount it al together. There is just enough slack to mount the belt. The cover contains the bearing and this will tighten the belt.
![](https://cdn.hackaday.io/images/7545871504432661808.png)
Below the inside of the lower part of Art 3. I already mounted the motor. A potentiometer or optical rotation sensor will be added later.
![](https://cdn.hackaday.io/images/9389531504432686885.png)
This is the top part of Art 3. It contains a custom bearing.
![](https://cdn.hackaday.io/images/1907491504432703971.png)
Below all the parts for this custom bearing. The green ball are 6mm airsoft balls. The small black part is the plug.
![](https://cdn.hackaday.io/images/4560831504432794388.png)
Just hold the inside and the outside of the bearing in place and fill the hole with balls.
![](https://cdn.hackaday.io/images/3690901504432829650.png)
By rotating the inner part the balls are traveling to the bottom and the hole is free to insert the next ball.
![](https://cdn.hackaday.io/images/1064821504432853354.png)
I used some tape to hold the plug in place. The plug will fit in the hole of the outer part on the left side.
![](https://cdn.hackaday.io/images/18371504432937819.png)
There is a small gap between the orange Art4 part and the Black Art 3 part.
![](https://cdn.hackaday.io/images/2637601504432959082.png)
Below the Art 3 upper and lower part are mounted together.
![](https://cdn.hackaday.io/images/2632291504432983194.png)
In the future I might change the custom ball bearing because it has to much slack. I want 2 bearings to keep this axis as steady as possible. I already ordered a few different sized 6xxx series ball bearings.
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I really like your step by step images.
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