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 frame stand holder 🖼️・3D printer model to
Frame – Free download 3d model Files
Frame Stand Files / Wood Display stand / Sign Holder 33
Photo Frame best STL files for 3D printing・202 models to download
Picture Frame Stand by Bernie
Picture Frame Stand by SpikeUK
FOLDING PICTURE FRAME STAND REPLACEMENT by Andi @ LFG Design
Picture Frame Stand by LT_Davis
Photo Frame best STL files for 3D printing・202 models to download
picture frame stand 3D Models to Print - yeggi