I looked for a nice 3rd generation echo dot holder here but didn't find one so I modeled one up in Solidworks (file included). This one printed up nicely and holds my 3rd generation dot pretty well. The print is HUGE. Sorry about that. The neck is pretty long because the 3rd generation echo dot has a ridiculously long 6ft power cord. I could have snipped it, soldered it back together and made this whole rig shorter but ehh..,, whatever. It's only filament. I rotated the print just to fit it on the Ultimaker2 bed. If you have a small print bed on your printer, you're gonna need to download the Solidworks file and make the neck shorter, but good luck fitting that 6ft of power cable in a shorter neck. If you do edit the Solidworks file, sorry it's a mess. I was in a hurry and even if I wasn't, I'm not the best at thinking in parametric thoughts.