My desktop is always a mess, full of cables everywhere. I created this little cable holder hive. It is meant to be used with small cables, but you can always scale it. Enjoy.

UPDATE:

Since this item is far more popular than I expected I decided to upload 2 new versions for larger cables.

UPDATE 2 (26/10/2017)

Model has been modified so that the hive has the same wall thickness everywhere.

Small size is now 120mm tall
Medium size is now 140mm tall
Large size is now 180mm tall

I believe medium size is the best choice.

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https://www.thingiverse.com/thing:4222048

Instructions

Since this is a very simple design, these settings are more than enough:

Infill: 0.4
Layer height: 0.3
Support : NO
Bottom solid layers: 3