Blendtec Classic Blender Base ~ FOR PARTS ONLY
~  Model CTB2 
~  570 BLACK
~  1575 Watt Motor

WORKING.  That said, selling "For Parts Only, As Is, No Returns" due to the issue of there being a plastic housing component inside the plastic cover/casing which has broken away.  It was there to hold the shaft firmly in place.  The resulting problem is the the unit now being extremely loud I would say it is not advisable to run it like this or to simply use it for parts.
Note: I was able to shake out out the broken up pieces of plastic (see last photo). 

You are buying working components such as motor, circuit board, related electrical components and cord.  Additionally, shaft and other hardware components that are part of this base unit appear to have no issue & should be fine for replacement part use.
So, replace the housing and you have a working blender unit, or simply use parts for replacement/repair.

  ~~~  SEE DESCRIPTION and PHOTOS  ~~~

SOLD AS IS FOR PARTS ONLY  ~~  NO RETURNS