You do not provide much information that would allow anyone to give you a
specific set of code.

What are the "different times"?  Minutes, hours or days apart?

Are the three workbooks printer-ready as far as print setup?

Turn on the macro recorder and select a workbook to print on a specific printer.

Once you get the code for one workbook, see Chip Pearson's site for instructions
on how to use the OnTime event so's you can schedule the times to print each
workbook.

http://www.cpearson.com/excel/OnTime.aspx

Maybe Windows Task Scheduler might be a better tool for this?

Gord Dibben  MS Excel MVP