I tried a few different Palette upside-down solutions to go on top of my lack enclosure, and found CarstenD's (https://www.thingiverse.com/thing:3458138) to work the best. The angle it was tilted at combined with the height placed it at an awkward angled for the filament path from my RepBox into the Palette though.

After lots of slicing dicing and twisting in Fusion, I was able to remix it into something that suits my needs better. This one is a little lower in overall height, and stands a little more upright.

Print instructions

Depending on your printer and filament, you can likely print this without supports. There are no bridges, but there is a good amount of overhang perimeter which are more severe than the original design. They were a little droopy, but perfectly functional. Your mileage may vary.

You can try to reduce the infill, but too little and there won't be enough support for upper layers at the bottom of the cradle where the Palette sits. My first attempt with 5% infill failed. 20% works fine.