I fixed a cracked ruler using clear packaging tape on the back and it worked just fine. I haven't tried with a broken pieces. Lowes here won't cut anything except window blinds.

Check with your friendly Ace Hardware, they sell and cut plastic. My DH makes me templates out of it all the time. Works great for those paper templates you get in your quilting mags. If you or your Dh can't or don't want to do it you can check with any window repair place, they may be able to help you. Good luck.

We've cut acrylic with a small circular saw. Put the blue painters tape over where you want to cut, draw a line and let her rip! Don't forget to sand the edge smooth so it doesn't have any rough edges to catch on the fabric.

The dremel would work. A fine hack saw is the shot as well - something like a scroll saw or jeweler's saw would work as well.

Love Dremel tools...... Hubby got mine at Sears....

Go to a glass cutting shop. They will probably cut it for you. Our local shop has made custom plexiglass templates for some of our guild members.

Thank you all for your help and advice. Unfortunately, the crack was at an angle, and though it was a clean break, would have been too unstable to glue back together, IMHO. My aha moment was to call my son, who is even craftier than I (the apple doesn't fall too far from the tree) and who has all the big tools. When I explained what happened, he said, sure, come on over. And 10 minutes after I got there, I had 2 rulers - 14" and 7-1/2". I told my DH that I wasn't going to replace it, since I had actually found the 24-1/2" length unwieldy and awkward to handle, but I had broken my June Taylor 12" Shape Cut and wanted to replace it with the 18". So he said he'd buy it for me. Like I said, he's a sweetie.

A picture framing shop or one at JoAnns or Michaels might cut them for you.

Ditto on Ace Hardware. If I need a template for cutting a lot of pieces, I get my local Ace Hardware to cut it out of plexiglass for me.

I can't speak for Home Depot but Lowe's will only cut the plexi that they sell. The reason is that if they mess the cut up they can't replace the item it they don't sell it. The plexi in rulers is a bit different thickness and makeup. It won't break on a score cleanly that Lowe's cutters make. After you cut it you have to sand the edge to make it smooth and remove the jagged parts. I have tried it. I also work for Lowe's so I know their cutter. I have used it many times.