Here you can see the material used (affiliate links):
3D Printing Filament: https://amzn.to/3zQRvzX
Magnets: https://amzn.to/3QHmjZK
Supercapacitor: https://amzn.to/3ybKW9Z
Copper wire: https://amzn.to/3QBWU3H
PVC pipe: https://amzn.to/3HIwfOB
Osziloscope: https://amzn.to/3zTOajy

In this viedeo I build a pneumatically driven linear generator. You could blow the exhaust air from pneumatic systems into a generator. This would recover some energy. Compressed air is expensive.
The pneumatic linear generator is not fully developed. Some problems have been encountered. One of the main problems is the precision of a 3D printer.
I have built 2 versions. You can download all 3D printed parts. 20mm PVC pipes were used. The magnets have a diameter of 15mm.

If you want to support me and my work. Thank you very much: https://paypal.me/FraensYT?country.x=...

Thingiverse: https://www.thingiverse.com/thing:532...
Prusarprinters: https://www.prusaprinters.org/de/prin...