need help with choosing stepper motor.

I am building a 3d printer with arduino and need to know if I can use a 17HS2408 nema 17 for the extruder. will it have enough torque? if not, what should I use?

The best place to get an answer to that question would be the Reprap Forum where they specialise in 3D printing.

Also you should post a link to the datasheet for the motor as people won't know the details from the codename.

...R

farmboyB:
I am building a 3d printer with arduino and need to know if I can use a 17HS2408 nema 17 for the extruder. will it have enough torque? if not, what should I use?

Find out / figure out / measur the torque that’s required for the particular 3D printer in question.

Look at the datasheet for the stepper and see if it has speed/torque graph.

Compare torque values.