Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4611544.
Here's my second foray into the weeds of FreeCAD, and holy shit, was this a challenging one!
This is made specifically for 1-inch Schedule 40 PVC [OD=33.401mm], but I've included the FreeCAD files for you to remix to your own specific needs! You can use the following site for reference on diameter: https://www.pvcfittingsonline.com/resource-center/pvc-pipe-dimensions-18-through-24/
There's a second pair with a thinner hook. The two can be mixed and matched, too. They're all designed to fit together!
We recently purchased a projector screen, but didn't have a frame to hold said screen. So I did what any red-blooded crafter would do... build one out of PVC! The only problem is... just wrapping the rope around the pipes to hold the screen worked about as well as you'd imagine.
I jumped into FreeCAD, PVC measurements in-hand [literally - I wrote the exact dimensions down to the thousandth of a mm on my palm] and got to work. Three hours later... I realized I went the wrong way with my design and scrapped it. However, my second attempt went by a LOT faster because I'm starting to get the hang of it!