I wanted to convert a few of my switches in my apartment to smart switches, so I needed a way to adapt the existing toggle switch to decora-style. The only existing solution is the TayMac AD40W which at this time is $12, and I didn't think that was worth it, so here is a sub-$1 printable insert which is similar to that design.

This should be safe as it's only a cover, however, print and use at your own risk. Just like another remix, I also made this printable without supports. It takes about an hour to print on 0.2mm height.

I didn't have white-filament, so the attached pics used beige-coloured filament. But it should be easily paintable.