The original design by @Német István was created for a board that is thinner than Ikea's and this remix changes only this one dimension.
I have tested this print and it fits the Ikea board thickness – see photo.
This design has little use on its own. István meant it as a part to incorporate in your own designs, so I'm also uploading a Fusion model.
License: I'm copying István's license as I take no credit for this design. István had the original idea, fine-tuned tolerances and even explained how to alter his model.
The author remixed this model.