USB Power Hub (12V to 5V)
thingiverse
Quick Charge 3.0 USB power Hub with an input voltage between 8 and 32 Volts. In there are three of these modules(https://www.ebay.de/itm/DC-DC-USB-Buck-Converter-Charging-Step-Down-Module-8V-to-32V-Charger-To-5V-QC3-O/173700123725?hash=item2871558c4d:g:PRUAAOSw7q5d5IBD) and a 40x40x10mm fan.
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