Ghostbusters Afterlife Spirit Halloween Proton Pack Power Switch

 Ghostbusters Afterlife introduced a key new part to the Proton Pack, the POWER SWITCH! 

This model is non-functional, but was unreachable by a 'Buster anyway! 
It goes on the underside of the Ion Arm assembly, as seen in this reference photo of a screen-used pack.

Even if you aren't making an Afterlife-themed pack, you might want this, as Afterlife retcons it to be on the original pack.

 Permanently modeled in the ON position, this switch is printable in 2 pieces.

This model is scaled for the 80% scale Spirit Halloween pack.  Scale it up if you have a bigger pack.