@geert_2:
The 3D-printed parts do not have to be air tight, or even water tight. (It might even be beneficial that they are not, so all the air can escape from the 3D-parts.) They just have to be firm enough to keep the 'kathodes' from touching the walls of the vacuumbag. To clarify I added a JPG with a picture of other (round) parts packed in the same kind of bag that I had in mind for the kathodes. So it is not the 3D-printed part that has to keep the 'kathodes' under vacuum. (From your comment I understand you might think this.)
The 'kathodes' are packed now in the same manner in a large plastic mold. But the amount of products we need in one run is far smaller than the size of the package, so we want to repack in smaller amounts, but we can not 'break up' the old mold in smaller molds. An idea was to 3D-print a smaller container.
(I foresee a question: What is the material of the old large mold?
Answer: I don't know, and a problem is that the manufacturer of the 'kathodes' does not exist anymore. but I might ask around because former employees still may be around somewhere...)
