For steep overhangs you need to use supports, or redesign the part so it has no steep overhangs. Or split it and glue both halves together, or print it in such a way that there are no overhangs while printing (if the design allows this; probably not here).
I don't know your printer, so if it is a single nozzle printer, you would need supports in the same material as the print, and cut them out later. In dual nozzle printers, you can use one nozzle for the support material, and the other for the print, and dissolve the support later.
You could design your own custom supports, if the model has special requirements, like I did in the test below. Or use the standard Cura-supports for general models, which is far easier.
Try this on small test pieces first, before doing a big print.
An example of custom supports, in order to not destroy the text below the bridge (standard supports would go all the way down). For reference: the main plates of this bridge are 1mm thick; text caps height is 3.5mm.
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ShiryouOni 3
Anyone else having this problem ?
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