spoil board resurfacing

I spent some time last week resurfacing the CNC router in the DCRL. I think this is the third or forth time I've done this. I'll be needing a new spoil board as I think this is the last time we can do this on this particular sheet. The router was used a ton this semester. My students created a lot of work with it. They also learned a lot about it's use. I like to have a little fun with them about "leaving their mark". I hate for things to get messed up, but then again I think I've learned a lot from my mistakes. As long as their mistakes aren't catastrophic I can live with a few mistakes.