Cord Holder: Made to have fit onto an edge of 135 mm. It was not anything too extravagant, padded a sketch then inserted two gaps. Made it so the the top could support most cords I have, as the side latches onto my desk. 
My desk
Base shape for a hook-like structure
Groove component attempt
further attempts
Sanity depleted with little progress
I struggled severely in getting two pieces that would fit together. I understand how most of the free CAD elements work, but having them work in conjunction with one another melted my mind. I can apply one effect on body, but adding onto it was something I could not wrap my head around. Attempting fillets, holes, grooves, and whatever else would seem to make progress in making something that was more than a cube with a curve.
A Blog 