to help your little guys move around after injury. Print the model, assemble according to video instructions, use straps to hold them in.
TOOLS REQUIRED: hair dryer or heat gun + flat head screw driver. https://youtu.be/aJB5dNbGkYg
SIDE NOTE: for this to work on hard floors you need to rubberize the wheels (hot glue gun+ rubber band). Works perfect on carpets etc as is.