What the licences require
CC BY-NC-SA 4.0 covers the three case designs: attribution, non commercial use only, and derivatives must be shared under the same licence. CC BY-NC 4.0 covers the flux syringe: attribution and non commercial use, with no share alike clause.
In practice that means you may print these for yourself and modify them freely, you may not sell them or prints of them, and anything you publish that is derived from the case carries CC BY-NC-SA 4.0 forward along with this credit chain.
Termiman and PjotrStrog turn up in all three lineages, so they are the names to credit first if you are shortening this.