Unit Crane Base

Here's the base to the crane I started Oh so long ago. My printer is only 9"x9", so I had to print it in pieces. The rollers are built to be free rolling once it's printed, and the front circle has to be printed in two pieces, because the base of the mast rests in the slot, with the small piece on top to hold it in place.
This piece is built as a non-working model, but I'm sure with a little tweaking someone could figure out how to put a small motor in the back to raise and lower the line.