The Smartphone & Tablet Charging Station dimensions are 20 x 13 x 6 mm. Can hold several smartphone (up to 10), reducing mess and cable crossing.

I 3dprinted with CTC Bizer (a clone of Makerbot) at 0.30 mm resolution. The bottom required around 13 hours and the top around 7 hours.

My advice is to reduce the top to 99%, in order to facilitate insertion and removal.

I ordered this multi USB charger on Amazon to connect 5 USB ports.
https://www.amazon.it/gp/product/B00MOAJ50A/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

You can choose between 3 kinds of bottoms: with or without divider and with Aukey divider.
You can choose between 6 kind of tops depending on the number of holes you prefer. My advice is to use the 4 x 2 stl files.