I'm porting my design over from Thingiverse. You can see some makes there: https://www.thingiverse.com/thing:5146923/makes
Most of this is easy to print. A few tips:
Assembly should be pretty straight forward. Most things have nubs, otherwise use lots of super glue. Print two "crane caps" and glue them on the very top after inserting the crank into the crane.
Crane is operated by pushing the crank slightly so the gear disengages. You can turn it to wind up a string, moving the elevator up or down. To keep it at the top, push the gear back over to it engages again.
The author marked this model as their own original creation.