This is common part which especially made not very strong - in order to be broken and so, save bycicle frame and derailleur from being broken (in case of any accident). But when it finally broken, it is usally not so easy to purchase the new one, since there are hundreeds different models! I've made this Hanger for my special bycicle (frame 'Cube LTD 2013').That is very simple to pring (no support, nothing special). However the part inself has to be printed in strong filament. And some of them (like Nylon or PA) need special care itself (may be necessary to add very-very big raft)