photo frame 3d model

Create a 3D printable rectangular photo frame insert for an alphabet photo frame. Overall frame size: 70 mm height, 50 mm width, 6 mm total thickness/depth. Make a front photo window with raised border. The internal cutout should be layered from front to back: 3 mm front border/lip depth, 1 mm space for photo, and 2 mm rear sliding back cover channel. The back cover must slide in from one side through a side opening. Add a side opening/channel for a thin back cover plate to slide in and hold the photo. The sliding channel should use 45-degree angled/chamfered guide rails so the part can be FDM printed flat without supports. Do not use horizontal overhangs. Add a small latch/lock at the end of the sliding channel like the reference photo: a small bump/notch stop that clicks or holds the back cover so it does not fall out. Keep the latch simple, printable, and flexible enough for PLA/PETG. Make the design clean, strong, support-free, rounded edges, minimum 1.5–2 mm wall thickness, STL