I’ve developed a basic robot that navigates around my son’s Duplo train track. It works find on the flat parts, but once it reached an incline at the start of a bridge, the wheels just spin and the robot stays at the bottom of the incline.
I’ve 3D printed most of the parts using PLA for everything, but printed tyres using TPU. The tyres definitely help, as the wheels were originally spinning even on the flat. Moving the batteries (2xAA) to sit over the drive axle also helped.
What else can I do to increase the traction and give my robot a chance of making it up the hill?