No. It is the other way around. I have some parts made in a Formlabs liquid resin printer and I can't break them with a hammer, They can be very seriously tough. The key is to use a non-rigid resin that comes out like solid nylon.

Formlab will send you a sample part printed on one f their printers for free if you ask. The resolution is very good too.

Go here can request samples https://formlabs.com/materials/

That said, for the person who wats just one part for their own bike, you can send the design file to a service and get the part for 1% of the cost of buying a printer. Buying a liquid resin printer that can use this "tough" material is only for the person who intends to make literally hundreds or thousands of parts. For most hobby users buy sub $200 FDM printer and it will do 90% of what you need the hire out the 10% you can't do yourself. FDM is good enough even for me who is right now designing a power steering gearbox for a robot car. I'll likely need to make a half dozen test-fit parts that get tossed in the trash an hour after they are printed. Only the last version needs to be strong enough to work.