In order to make a printable calendar, you need to use a program called pscal.
You may find it on the internet, download, and install it.

pscal may be donwloaded here:
http://www.panix.com/~mbh/projects.html

There are 2 ways to make printable calendars from MyCalendar.  

Automatic

1. One way is to enable it web based way using sitevariables.pl.  This is
probably done by default.  After downloading and installing pscal from the 
link above, simply edit sitevariables.pl with the path to pscal and it
should work automatically.  You will see a link on your calendar that says
"printable version."  If you have ps2pdf it will also be able to make .pdf
versions of the calendar.

Manual

2. The second way is to use the scripts and tools detailed in this article.  

Either process is fairly simply and straight forward.

You can convert the events on your online calendar that are stored as .txt
files to the ~/.holiday file that is used by pscal by using the ./convert2pscal
script that is included with this program.

To use:

./convert2pscal

This will first create the .holiday file needed for pscal.  It will then lead
you through the process of copying this file to your HOME directory and it will
attempt to print the file or convert it to a pdf for you.

If you run into problems, you can always do it manually with the instructions
below:

1. this will crate a .holiday file
2. move this .holiday file to your home directory
3. now use pscal to print out the calendar for whichever month you want
pscal [month] [year] | lpr

Done!
