I liked the Amazon Echo Dot 3, Socket Mount by Ian McConville, but the hole for the AC adapter was very tight. I stretched that out about .5 mm, and then stretched the space between the adapter and the dot by about 10mm and just stuffed the cord in there, doing away with the back piece all together and making it a one piece design.

It could probably use some type of door to hold the cord, but it stays in place OK from me.

Creality

Ender 3

No

Yes

.3 mm