I have a blow molded table that has these pieces to hold the legs up and folded. I couldn't see a manufacturer name on it, but whatever!
Check out that picture! What a mess. I originally printed that old fella some time ago. Holy layer shift, Batman! (I corrected that by tightening up the fasteners holding the hot end to the hot end trolly. What a nightmare that was to track down.)
The author marked this model as their own original creation.