A wall mountable cable holder. You choose the size and number of slots. You can have some slots larger than others. The one in the picture is made out of 3mm MDF, which is too weak. Either use something stronger, or add a centre support. To turn this into something laser-cuttable, I exported it from Openscad to DXF, imported that into Inkscape, rearranged the shapes, set the correct line style and exported it to PDF, which the laser cutter accepts. This makes the customizer a bit pointless, but at least you can have a play before downloading the design.