Members with a scheduled appointment have priority on the laser cutter during that time. If no one has time booked, the laser is available for walk-up use.
If you use Google Calendar, you can also “invite” the laser cutter to a meeting. The laser cutter calendar’s address is:
tcmaker.org_2d3935333934333630383333 (at) resource.calendar.google.com
If the time is available, your invite will be automatically accepted. This will only work from a Google calendar — other clients are not supported.