I use many note slips from cutting scrap paper into eight pieces. A few years ago I adapted a business card holder to hold these note slips. That card holder is no longer sold in stores. I wanted to see if I could make my own from some 1 1/4 inch electrical conduit PVC I had left from another project.
Step 1: Cut the paper
My scrap paper is 8 1/2 x 11 inches. In many countries the standard paper size is A4, which is just a little larger and is sized in metric measurements.
This is a paper cutter given to me and my wife by my in-laws many years ago. Although not easy to see in this photo, I painted a red dot on the left side scale at 5 1/2 inches, 4 1/4 inches, and 2 3/4 inches. This marks for easy cutting into halves, quarters, and eighths.
Step 2: Cut PVC to length
I marked a piece of gray PVC for cutting so it is just a little shorter than my note slips.
Step 3: Mark around the circumference of the PVC
I used a square like this to make short marks until I had gone all the way around the PVC. It is a little tricky to get a line for cutting that does not wander. Another way would be to loop a string around the PVC and pull it back and forth just a little until it is taught. Then mark along the string.
Step 4: The lines meet
You know you have successfully marked around the PVC in a straight line when the lines meet. Saw the PVC.
Step 5: Mark lengthwise
I have found a book is a handy marking tool. Place a book on a flat surface. Slide the tube up to the book. Use the surface corner of the book as a guide and mark a straight line. Rotate the PVC about 110 degrees and make a second mark like this one.
Step 6: Saw on both lines
Saw out the section between the two lines 110 degrees apart. Try to make the two saw cuts exactly parallel for the sake of appearance. You can clean up any inaccuracies with a file later.