UniFlow D1: Stackable 17-in-1 Dock for Macs
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This is the UniFlow D1: a nifty stackable dock designed to fit your Mac well. It is a sleek 17-in-1 dock that can connect to 3 x 4K displays. It also has a bunch of fast ports, including a 5Gbps USB port and 10Gbps NVME slot. You will be able to put 2242, 2260 and 2280 SSDs in this to enjoy read and write speeds of 800MB/s. Its USB port offers PD 3.0 charging up to 100W. The D1 is designed to easily fit under your Mac Mini, so you can use it on the smallest desks.

This dock is powered by your Mac Mini, so you are not going to need an external power source to get this going. Its audio jack lets you use headphones and microphones seamlessly. You get a total of 14 ports, including USB-C, USB-A, HDMI, and Ethernet ports. This project is getting funded on Kickstarter.
[where to get it]