Chainmail #2

Get the test print right first.
Print with a 1.5mm brim, more if you scale it up in size. Unlike my Chainmail #1, this version has very little footing area to stabilise the vertical donuts.
Try 0.2 to 0.35mm layer height and a good head fan, print slower and cooler until the spans bridge between the upright donuts correctly. Note that the donuts are formed by rotating a squished 12 sided polygon to improve the hole space utilisation inside the horizontal donuts.
If you have a fancy metal printer then do the big one, please print the "made by fluidity tag" and find an architectural use for it! :-) Post a picture too... it makes this place more interesting!
Cura slices the big print in about 15 seconds on my laptop.
I suspect it recognizes repeated elements.
You may have up to half a day slicing if you use slic3r with the big mesh
I've deliberately set a low polygon count to reduce the file size and to get a good start to printing the feet of the donuts, but there's a