I wanted to have a way to put my UE Boom on my bicycle where I could hear it (instead of a backpack). This is what I came up with.
Modify as you see fit. I make no promises on stability or durability, but it works for me. Use at your own risk, and try to take it easy when you have it mounted. I printed it with ABS, and it "seems" fairly strong, but I haven't tested it thoroughly (trails, major bumps, etc.).
Autodesk 123d Model: http://www.123dapp.com/123D_Design/UE-Boom-Bicycle-Mount/4192125
I've ridden the bike with the mount and speaker for a good few rides. It's taken bumps and turns and seen no problems.
- I took a spill on my bike this morning due to a crowded sidewalk and a drop-off. The speaker fell out of the mount, because I only had it in there with earplugs, but the mount didn't take any damage. I recommend finding a way to secure the speaker into the housing if you're going to be doing anything rough.
I printed this on high quality. I used the "Everywhere" support setting, due to the many overhanging parts. The support was not too difficult to remove, but the pieces under the bracket did require a pair of pliers and a bit of hacksaw work.
Use sandpaper to smooth out the edges so you do not have any burrs that will catch on your speaker housing.
I suggest you use a rubber shim in the bracket portion so it does not scratch your bicycle. Additionally, use two foam earplugs, compressed longitudinally, underneath the font of the speaker. This provides some shock dampening for your speaker and keeps it securely in place.
If you wish to secure the speaker in using a rubber band or similar device, more power to you.
You'll need to pop out the bracket holes, as the support fills them in a bit. It's a simple task, but you'll have to clean up the hex hole a bit. I recommend a dental pick.
If your bicycle tube is thick, you might have to use a zip tie through the holes to secure it. Otherwise, if the tube fits, and your rubber shim is well-fitted, you can use an M5 bolt and nut. The hex hole is the size of an M5, and you can use a wingnut to secure it, but you will have to drill out the hole a little bit to make the bolt fit easily.