I dropped my plunger and it cracked. I ordered a new one from Tefal and copied it in case I broke it again.

In order to teach myself CAD I have tried to faithfully reproduce the dimensions and features of the original, its not perfect but pretty close.

I printed a prototype in fine setting on my X1C, I found the dimensions needed tweaking, in order to save time I printed the second prototype in draft mode, I can't really see much difference in quality between fine and draft that would affect its use.