Couldn't find a mount for the Eero 6+ (Eero 6 Plus) routers, and the ones available are for the 6e pro, and are not even close in size. Figured I could make one for my needs, and hopefully yours. There is a small amount of space under the router for cable management, but i didnt need it.

FlashForge

Adventurer 3

No

No

.16

100%

If you want to take the time, and your slicer permits, you technically could make the base only 15-20% infill. I recommend not wasting your time though, as this will only save about 5-10 minutes. Because you need to deflect the arms a fair amount to get the router installed, it needs to be 100% infill. I guess you could alternatively try a "Tough" PLA, or ABS if your printer permits.