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.
Photo Frame best STL files for 3D printing・202 models to download
Frame – Free download 3d model Files
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Standing Picture Frame | 3D model
Frame – Free download 3d model Files
Scalable picture frame (customizable) by Pascal N/m²
FOLDING PICTURE FRAME STAND REPLACEMENT by Andi @ LFG Design
Picture Frame Stand by Bernie
▷ frame stand 3d models 【 STLFinder 】
photo frame stand 3D Models to Print - yeggi
Picture Frame Stand by LT_Davis
▷ frame stand 3d models 【 STLFinder 】
Folding Picture Frame Stand by David@3DOMEngineering
picture frame stand 3D Models to Print - yeggi
picture stand 3D Models to Print - yeggi