Editing Quickstartguide:Laser Cutter (section)

==='''Read before use'''===
*A laser cutter is a dangerous device that can cause serious fires if not used responsibly. Always consult with an instructor before putting material in if you're unsure about its suitability.
*Because of this potential fire hazard, '''do not abandon the machine'''. Satisfying your nicotine addiction is not worth torching the Printmaking Studio.
*In case you see fire or excessive smoke occurring in the machine, '''hit the big red button immediately'''.
*This seems fairly obvious (and it's also nigh impossible to do with this machine) but '''never look directly into the laser''' as it will ruin your eye sight. 
*Because we don't want to sit around with gas masks on, engraving or cutting PVC is '''forbidden'''.
*Same story goes for MDF - '''forbidden'''.
*A total no-brainer, but just to state the obvious: if your material does not properly fit in the laser cutter, then either cut it to size or find something else.