This is a clip for 1/2 PVC pipe. I made this so that I can create blanket forts with my son. I modeled this clip based on the model found here:
I was concerned about my toddler choking on the smaller clip with this set. So I created a little bit larger version. I have included the Fusion 360 file for this so that it can be modified easier.
Disclaimer: I have no actual information on the safety of this part for toddlers. It may or may not be any safer than any other part.
I printed this with 4 outer layers. It makes a really sturdy solid clip.