These are the Front and Back panels for my Single 18650 Squonk mod
They can either be 3D printed as well, maybe in a different colour to achieve a contrast to the frame. For example a black frame and orange panels. Or you can download the .dxf file for those panels on my website www.modern-crafts.net
to cut them out of wood or acrylic with a coping saw, scroll saw or use a CNC or a laser to do the job.