Here is a rough process of how I came up with my cell phone holder.
Step 1: Design Idea
First I came up with an idea that I wanted to make a phone holder that could be mounted to the wall and be eye level when I was in bed. Some of the design criteria is:
1. it had to be light and a simple design.
2. Had to be able to hold different phones.
3. Have to have a spot for the charging cord.
Step 2: Ideas
I found some ideas by looking on the internet and going to auto part stores because the would have something that I could possibly convert. I struck out and but took some design notes and went to the sketching board.
Step 3: 1st Design Idea
After sketching I used a 3D CAD software to draw out my idea. I made some design modifications along the way to increase stability and structure.
Step 4: 3D Printing
After finalizing my idea I made a set of prints and had some colleagues double check my ideas and measurements. Then I sent it off to the 3D printer. I left it to print over night, to come back and find out it ran out of filament half way through the build. That is why its two tone.
Step 5: Assembly
After another 8 hours of printing I had my model. I went down to the local hardware store and bought some 1/4-20 UNC truss head screws. Then after taping the threads into the plastic I screwed it together.
Step 6: Final Product
After screwing together I found out that you can't drill into the walls. so I found some double sided foam tape. stuck to the part then to the wall and held for a minute or two to insure adhesion.