Arduino Doodlebot

Aright, here's my struggle, we still need to 3d print a camera holder and a ultrasonic sensor holder for the doodlebot and my design is very similar to the cardboard design that you saw in the video. I'll attach a pic of my Creo assembly. But overall, do you have any tips or ideas for how I can neutralize the weight of my doodlebot? Thank you for all the help btw.