Print every teacher's timetable at once, and stamp it DRAFT
One page for each teacher, in one print. A DRAFT watermark until the timetable is final, and changes for one sheet only.
Blog Sharing & publishing
Blog
Tricks, tutorials and worked examples for building timetables.
Sharing & publishing Collect teachers' free times with one link each Send each teacher a private link. They tap the slots they cannot teach. The answer is saved in your timetable as a FET constraint. 
Your timetable is finished. Now forty teachers need to see it.
Generating the timetable is the part everyone plans for. Publishing it is the part that quietly costs you the rest of the term.