This small piece of plastic provides ideal alignment of two bars that you want to connect.
In my case, I designed this piece to attach two garden poles at right angles. The centering guides are used to maintain the squareness and the openings inside are used to thread a cable tie.
Depending on the size, you can scale the part to fit your needs.
Recommend printing it in PETG or ABS/ASA or nylon as it would melt from sunlight.
Supports are not necessary.
The author marked this model as their own original creation.