Quote Originally Posted by RCaffin View Post
I think those two 'carriers' are actually the support for the drive motor.
The leadscrews don't look like a copier to me. My 2c.

Cheers
seems you are right ,Look,different size of belts(are they ?) can be connected to there, definitely support for motor.but i don't know if it can use different belts ,for what ?changing the speed ?