OK got the files, thanks.

I imported the arm2, base2 and claw2 objects. They all arrived up in the air and off center they all need to be on the ground and centered.

I repositioned each one.
xTran -0.031
yTran -0.509
zTran -0.0055

Exported out each part and then used those files in All Tied Up.

Figured formed correctly.

New CR2 and revised OBJ files emailed back to you.

Hope that helps :)