protype 1:

Result: 

• We need a change in the fixation. We want something removable and attached on the armrest=>an elastic around the armrest
• We want the possibility to hold a mug (with a handle)=>hole on the ring of the cupholder
• We also want the possibility to hold all size of cups => just one low ring on the cup holder

protype 2:

Result: 

• we need to adjust the measurement of the tray=> a smaller tray and ring that can hold universal cups.
• think about a better way to fix it for it to be removable and secure=> system of attach removable with a slide we can stuck on the side.

prototype 3:

fixing part

body part