<p>I recently saw <a href="https://www.youtube.com/watch?v=TpvNEZCvk84" rel="noreferrer">this</a> video of super-swellable polymer and felt inspired. Printing a swellable structure would be sort of interesting. However, sodium polyacrylate isn't a printable material. Does anyone know of a material that is? Preferably, swelling activated by water. </p>

To print with 2 extruders simultaneously you need a firmware that supports that. Luckily, there is a firmware called Sailfish that is able to do that. The feature you are looking for is called
```
Ditto
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printing.
Sailfish firmware is found
here