This is the solution to a lot of queries I get from a kit car forum to which I belong - 3D-printing novices think that they can make bits to fit on their car engine, not realising that the filament's printing temperature is way higher than the moderate temperature at which the finished items will collapse in use (glass transition temperature?). Many of these people could design and make parts using the lost wax process instead.
What filament did you use, and what problems did you encounter?