The Marble Level shows if a surface is level by using a rolling marble to indicate tilt

1. Print the "level" file.
2. Choose either "panel with numbers" or "panel without numbers" and print two copies, depending on your preference and printer capability (note: the numbered panel may be more challenging to print).
3. Insert a 16mm marble before attaching the panels. If the panels don't pressure-fit, you can glue them in place.