I had to cut my IKEA Mosslanda to a smaller size to make it fit, but I didn't like seeing the wood. So I quickly designed a side cover.

Material: PLA (any material/color will work)

Layer height: 0.2mm will work best, since the model is 1mm high.

The model can be copied and mirrored in your slicer, to have left and right versions.

It is advisable to sand the surface of the wood to be smooth, before gluing the cover on. I used wood glue but most glues will work. Gaps can be painted with a white sharpie to be less noticeable.