Backlash - 1lb combat robot

I designed this to be a competitive 1lb combat robot that uses only off-the-shelf and 3D printed parts. The Excel file contains a shopping list of all of the parts necessary to build the bot as well as some notes regarding the parts. Each of the STL files needs to be printed once to assemble the full bot, with the exception of the lid/base file which needs to be printed twice. I have included a cross-section picture of the weapon shaft assembly to try to make it's assembly as clear as possible.

Update 1/21/19: I uploaded v2 of the motor pulley, modified to be a better fit on the motor and easier to print.