The library reserves the right to prohibit or stop any project that the staff deems a risk to people, the building, and/or the equipment. Projects that produce strong odors may also be prohibited if they are causing discomfort to any patron or staff in the Makerspace.
As long as you are following procedure and using the presets, fire is very unlikely. However, you still need to know what to do in the event of a fire.
Small amounts of smoke, sparks, and tiny flames are normal, especially when using the laser to cut.
...then it is considered a safety hazard, and the job must be stopped immediately.