I tested dollar store solar panels and then combined them into a larger solar panel that outputs 7.2 volts and 85 mA of current. This project is currently charging 18650 cells one at a time!

Thingiverse Files: https://www.thingiverse.com/thing:448...
https://share.glowforge.com/n5n792df
Ender 3: https://amzn.to/3kVAyfE
Multimeter: https://amzn.to/3utSUrf
TP4056 Modules: https://amzn.to/3kVOJBF
18650 Battery: (Best to Salvage but heres some from amazon) https://amzn.to/2WpXIkW

Hookup Wire: https://amzn.to/3D3u5FF

Donate some sats: bc1qy90czk37qsjexz368jtkjhuqschf83pj69vv43