Thanks! I tried it with the print added and it returned as "nil solid" even though it had just broken the block. Am I doing something wrong? Do I need to add a delay? I should also note that my robot doesn't have a tool so it takes a second to break the block.
EDIT: I tried the program using different axes. Although the speed was increased with each tier, the robot will only move forward after the break with the diamond axe. Every other time it returns as "nil solid".
Do I need to post about this on Github? I'm not sure if this is a bug or not.