Almost perfect on the first try.
About a month ago I designed this cartridge holder as an addition for the carrier I already had. Then the UP! broke. I finally printed and tested it and I have to say, wow, I almost did it right on the first try. Cartridges press neatly into the rubber pads and the cartridges are firmly stuck in the holder. That is the only issue. They are stuck.
I will add 1mm to the front to give it just that tiny bit of clearance and round the top to make it easier.
@Wonko, great work. I don’t think my input will be of much help right here, but when I come up with something, I will tell so immediately.