Why buy a dice tower when you can design your own!
Dimensions are approximately 150 mm tall, 150 mm long, and 90 mm wide. The tower door opening is 40 mm wide. All the dice shown in the picture can be dropped in one handful and consistently stay in the dice tray. The assembly is approximately 220 grams with a 10% infill. I would guess that you could scale it down by 50% and still get a standard D6 through it, but I haven't tested it.
It prints as two parts for ease of storage. The version 6 tower needs support (only for the hex fitting into the tray), but the tray does not. The tolerance between the two parts is loose.
UPDATE: Version 8 modifies the hex key/hole joint to eliminate the large amount of support needed on the tower around the hex. The tray has been enlarged to have a 7mm border around the tower and hex key/hole in the tray is now the size of the tower. Radial clearance was reduced to .5mm for a tighter fit. The wall thickness around the tower windows was also increased to improve the strength. I have not printed this version yet.