The "An infinitely adjustable picture frame" includes a hook piece to hang the frame. This stand piece add the possibility to have a standing instead of a hanging frame. The stand comes in 4 different variations ranging from a vertical standing frame to a 10, 15 or 20 degrees leaning frame.
In order to create the stand you need to print a connector piece and the desired 0, 10, 15 or 20 degrees foot. A picture frame requires two stands to stay upright.
The fit between the two parts is rather tight. Depending on the tolerances of you printer you might need to scale one model or use a clamp to connect both pieces together.
The author remixed this model.
Option to stand the frame upright instead of just hanging the frame.