My top list:
- The Pin Tool. This makes everything go faster for builds. Buy 2 for each team
- 1x beam kit - has everything from 1x1 to 1x20, includes all the odd sizes. I love 1x1 beams to lock parts in place.
- Standoff extenders
- Cap Pins - When my teams lock into a design and they think that the build is solid, they go back and do a rebuild with cap pins where possible,
- Motor shafts and Capped shafts -
- Corner beams
- Corner connector advanced kit
- Long beam pack (1x)
- Long beam pack (2x)
- Sprocket / chain and extra chain
- Enough omni wheels for each team to have 4
TBH I loved Slapshot and Full Volume, not for the game but for the huge amount of different parts. Colors rock!