I create parametric modular cable holder for IVAR.

You can find 2 prepared version - for 300mm and 500mm version of IKEA IVAR, but also parametric model for Fusion360. 

Inside you can simply setup amount of hooks and whoala - you have it :-) 

PS: One module for hook have 15mm, so simply multiply it to your custom size.

You can print it simply without support

Happy print