Once we placed the motor in the robot, we found that the metal shaft was too small and that the wheels touched the bottom piece and were unable to rotate. Therefore, we decided print out new pieces and make the design smaller in width. We shortened the width of the bottom piece and the length between the two sides. This is a picture showing how the motor could not work in this first model.
This is a picture of when we assembled the smaller pieces. As you can see, the wheels just stick out from the side and are able to rotate freely.
This is a picture of the robot after we connected the side pieces and the wheels. We first used heat staking to connect the sides pieces into the front. This was a long process because we had to do 12 (6 on each side). We had to heat stake with the motor inside the body because when the sides were permanently attached, we wouldn't have a way to fit the motor and the shaft within it. Then, we placed the bottom piece and it fit very tightly and didn't fall off. We then attached the wheels and the connector pieces to them. With the new dimensions the motion worked!
However, there was one problem. The holes intended to connect the wheel and the connector pieces were made for a loose fit, but it didn't work very well because either the connector pieces wasn't completely parallel to the side pieces or the rod kept falling off. Therefore, we decided to make new wheel pieces with the outside holes to be tight fits. This is a picture of how the rods were falling off.
This is a picture of when we assembled the smaller pieces. As you can see, the wheels just stick out from the side and are able to rotate freely.
This is a picture of the robot after we connected the side pieces and the wheels. We first used heat staking to connect the sides pieces into the front. This was a long process because we had to do 12 (6 on each side). We had to heat stake with the motor inside the body because when the sides were permanently attached, we wouldn't have a way to fit the motor and the shaft within it. Then, we placed the bottom piece and it fit very tightly and didn't fall off. We then attached the wheels and the connector pieces to them. With the new dimensions the motion worked! 
However, there was one problem. The holes intended to connect the wheel and the connector pieces were made for a loose fit, but it didn't work very well because either the connector pieces wasn't completely parallel to the side pieces or the rod kept falling off. Therefore, we decided to make new wheel pieces with the outside holes to be tight fits. This is a picture of how the rods were falling off.
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