This is a two pieces support, combine them and you are done. The max supported frame size is: Height 22cm Width 17.5 cm Length 1.8 cm You may have to scale this from 100% to 1000% in your slicer before printing.
Free STL file Picture Frame Stand / Holder 🖼️・3D printable
Folding Picture Frame Stand by David@3DOMEngineering
picture frame stand 3D Models to Print - yeggi
photo frame stand 3D Models to Print - yeggi
Picture Frame Stand by SpikeUK
picture frame stand 3D Models to Print - yeggi
Picture Frame Stand by LT_Davis
Picture Frame Stand by Bernie
Free STL file Picture Frame Holder 🖼️・3D printing model to
Free STL file frame stand holder 🖼️・3D printer model to
picture frame stand 3D Models to Print - yeggi
▷ picture frame easel stand 3d models 【 STLFinder 】
Picture Frame Stand by SpikeUK