We’ve had a picture frame in our bedroom for about 18 years. And for about 17 of those years, the flimsy little piece of cardboard on the back of it that’s supposed to make it stand up has been all bent and weak and generally unable to do its job. Various attempts to fix this in the past have involved copious amounts of both duct and masking tapes, plus… paint stirring sticks??
Good grief – this is clearly a job for a 3D Printer!

