So I have recently purchased some garden stakes, and instead like a normal human being and using some wire to connect them, I have 3D printed the connectors. They are quite sturdy and do not move around at all on the stake.
The main stake is 11 mm diamater and the cross braces are 8 mm. I have also uploaded the Fusion 360 file so you can tweak the diamaters to fit your own stake.
I would recommend printing it in a filament thats good for outside conditions (PolyLite PETG Dark Green is almost the same color as the stakes so I would recommend that). 10% infill and a layer height of 0.28 mm for a faster print. Also make sure you rotate it 45 degrees to get strength in both directions.
You can also print multiple of them without any support, just using the brim for holding down power. (see last picture for configuration) I personally printed over 50 them with a 6 mm brim setting and none of them detached or moved before I wanted to, but your milage may vary.
Because there seems to be some incosistency between stake manufacturers, I would also recommend printing 1 before mass production to check for fit. When I got some new stakes that were clearly manufactured elsewhere (bit different green), I hade to scale it to 98% to get a proper click out of it.
The author marked this model as their own original creation.