Logitech Ergo M575 Logitech mx Vertical 0:00 Intro 0:44 Preview 0:58 A bit different, and my qualifications 1:40 What's in the box? 3:00 So why even consider a trackball? 4:49 Build quality and design ...

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1x Elite-pi micro controller 1x Tindie PMW3360 pcb 34mm trackball (perixx sells them; you could also repurpose one from a logitech M575 or MX ergo). 3x 3mm ceramic balls (Zirconium Oxide or Silicon ...