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.
simple 3D printed frame stand, 3D CAD Model Library
picture frame stand 3D Models to Print - yeggi
Picture Frame Stand by SpikeUK
Picture Frame Stand by Bernie
Frame – Free download 3d model Files
▷ frame stand 3d models 【 STLFinder 】
Universal Plate/Picture Stand with Improved Base by
Free STL file Frame stand・Design to download and 3D print・Cults
▷ frame stand 3d models 【 STLFinder 】