I run a 106sv, LVS34 and 32ah battery and they all fit fine inside the zipped up Garmin XL bag and shuttle. I’m not a fan of the 3D printed shuttles, small screws going into printed plastic used in sub-zero temps can have disastrous consequences….
None of the screws on my summit shuttle go into plastic. All of them have a square nut insert that they connect to. I have dropped mine in -25 degree weather from the tailgate onto the ice, and bounced it off the quad a couple times now and it is still great. That being said, I will be moving to a metal shuttle at some point as well just cause I want to try the BK that came out this year.
The nice thing for me is I have a printer and the ability to draw and create things so if something does break I can just print another one.