hey Hideaki88,
I do have loose .obj files of the cohh logo but they are not a " waterproof " stl file so printing them would result in some issues cuz they are all loose
https://gyazo.com/d62b6bc5684beda9a98ad3c7f85aaa3c.png
the issue is i never made it to be exported as a full 3d printable version.
here is a idea:
what you can do is create it yourself from the files in this post:
https://imgur.com/a/aa6LK
and basically import the 2d logo into something like blender w/e and extrude a 3d model out of it.( the only issue with a 1.obj is texturemapping it i guess so you prolly have to make a mtl file for it too)
anyways the version i have is ALL loose since that works best for animation and such and i am not willing to share that publicly for obvious reasons.