I have been thinking a lot about pulleys lately, couldn't find any I wanted to print, so I modeled one of my own. It should be able to handle a fair load, but I haven't tested. I plan to use this to hang a hanging basket. You might need to scale the nut up a few% if it is too tight on the bolt. I highly recommend laying the outer body down on it's side using supports inside for the strongest print orientation along with plenty of walls and top and bottom layers, but I won't tell you how to live your life.

I included a boxy version, as well as a more rounded version I think looks prettier, both are basically the same, in terms of function, I theorize however, the pretty version isn't as strong. both serve the same function, and fit everything else exactly alike. The pretty version will also need more supports.