Vex one-wrap velcro makes a great alternative to the plastic battery straps. Velcro is a lot easier to use when in a hurry. Just cut a short length, fold it in half and then cut out a V with side cutters. Use a washer to avoid the velcro pulling off.
Want a tilt sensor thats legal in the Vex Robotics Competitions? You can use an accelerometer as a tilt sensor. There will always be a 1g downwards force on the accelerometer, so you just have to find how much force there is on 1 or 2 axes. One axis will give you 180 degrees of rotation, while 2 axes will give you a full 360 degrees.
There is a known bug when using RobotC with crystals. When playing a competition plugged into a field controller, the robot will time out 2 or 3 seconds to early. This has been tested with RobotC versions 1.4 and 2.0.1. To fix the problem, replace
The robot will still stop at the end of the game, as the field controler will disable the transmitter.
This is only for crystals. VEXnet does not have this problem and you can remove the user control duration and autonomous duration lines altogether
Use a cable tie as shown in the below picture to keep wires from coming undone
When your allen keys get burred, file them down to make them last longer.