Simple 15 mm riser for the Kawai CN-201 digital piano. Might also fit other models.

Best printed with some durable material like PETG and high infill.
If it's too long for your printer, use the PrusaSlicer split function and add a connector as seen in the screenshot.

If you need a different height, you can clone and adjust it here: https://cad.onshape.com/documents/96413483ba2f1905746608ad/w/cc1d25f39c497ca6b3b04f7f/e/0dae554629d6896252e65881