This is the first year we didn't have a weight loss problem because we painstakingly did everything in CAD, made sure all the material properties were set, and also designed 10 pounds under.
In 2005 we were about 10 pounds over, we spent the last week filling every square inch of the bot with holes except for the chassis. Our anodized chassis plate was covered in sharpie marks after all the cutting so we doused it in isopropyl alcohol and set it on fire
Not as quick as scrubbing it with solvent, but much more fun.