Love the design in general, nice and understated. I'm not sold on the typograhy for the numbers, it seems a bit overdone. The rotary encoder seems a bit pointless, I wouldn't know what to use it for other then volume perhaps? Could the aluminium base be replaced with more of the recycled plastics? If you are going for sustainable, that seems more sustainable then milling one of the more energy intensive materials we…
I tested out using the encoder for other things like zoom in/out but I haven't found anything where it felt more useful than volume.
In regards to the case, the aluminium case gives the device a reassuring heft. My preference would be to make it out of some % of recycled aluminium but this is proving hard to source in low volumes.