We are currently testing the boards with different cartridges to ensure there are no problems whatsoever.
There has been a little setback with the DC-DC converter boards (to get +/-12v on the cartridge ports). The DC-DC boards we made had a design mistake so we had to re-order them. This will delay a bit the availability of the Zemmix (about 10 days delay). We expect to have some boards available by the 2nd week of January 2018.
As someone suggested us, we are considering making the Zemmix cases with silicone moulding and casting. We are currently looking for someone to make the molds and researching what material would be the best to cast the case parts. First units will still be sold with regular 3d printed cases though.