What plastic is the OEM part made from? I suspect it is a fibre reinforced engineering plastic. Why can it not be repaired?
The repair may not look good but it may be stronger than a printed part which has defined weaknesses between each layer. The original part is a strong homogenous plastic part and still breaks.
I would not want to make a part, sell it and then find it is weaker than a properly repaired part.
Just my 2 cents.