Will fit an iPhone 6 or 7 with a case, and provide passive amplification to speaker as well as providing charge, just thread the Apple lightning cable through the hole and twist to seat. There is a groove to hold the cable neatly behind the dock.
I am able to print this on my fairly basic MOD-t 3d printer. This model will stretch the bridging and overhang capabilities of your printer, but it will still print successfully without too much sagging or stringing. I highly recommend a raft or at the very least a 5 line brim for improving the contact area with the build plate otherwise the model is likely to come away. Supports are a must to support the base of the acoustic void, but you should avoid allowing supports inside the acoustic void, this will preserve the appearance of the printed surfaces that are in plain view. When I set an overhang angle threshold of 44° on Cura, it produces only two lines of support for the overhang on the side cutouts, which works perfectly in my prints. Infill can be set at 0% without reducing the models rigidity.