I know there are a lot of paper pot how-to's but I wanted to show a quicker way. Afterall, who wants to spend more time potting up seedlings?
Step 1: Items Needed
Tin can (about 15 oz. size)
Can opener (preferable the old-fashioned type that cuts the inside of the can)
Plastic canning funnel
Tools to cut the newspaper
Step 2: Assemble Pot Maker
Before you cut your can open, take a look at the bottom. You need to open both ends and the one on the left I could not open. The one on the right is the type you need. I prefer the old-fashioned can opener so that there are not sharp edges left on the can. However, you should not be handling it on the inside so don't worry if the newer kind that cuts the outside of the lid is all you have.
After you have emptied the can, cut off both the top & bottom lids, and cleaned it, all you need to do is tape it to the canning funnel.
Step 3: Prepare Newspaper
My newspaper is 11" wide by 24" long. First, tear it on the fold and create a large pile. I use a cutting mat, a knife and a ruler to cut the pile in three 8" x 11" strips. Just keep making strokes with the knife until you cut through the whole pile. It doesn't have to be perfect. My local newspaper used to be wider and it worked better but 22" is too long and we're going for maximum efficiency so I make do.
Step 4: Wrap the Newspaper and Make the Pot
Wrap the strip of the newspaper around the bottom of the can about 4" - 5" up. Twist the extra on the bottom and push it in. Dip the pot maker into a container of potting soil and shake down. Slide the paper pot off and set into your tray.
This is much quicker than flattening out the bottom and trying to fill with dirt after you have them in a tray.
Step 5: Fill Tray
The typical plastic tray is 11" x 22". I can fit 4 pots by 8 pots across for a total of 32 pots. When I used to use yogurt containers I could only fit about half as much for the same amount of room for the seedling to grow! I also had to punch holes in any containers for drainage and they would fall over easily. I do use trays with no holes because I don't want them to leak on my plant stand. I have learned with experience how much to water. If you have the ability to use trays with drainage holes, go ahead.
I tore one paper pot open so that you can see the nice root growth. I use masking tape and a black permanent marker on the outside of the tray to list what plants I have from left to right. For example: Lemon Basil 8, Cinnamon Basil 8, Lime Basil 4, Regular Basil 12. The one disadvantage is it's not easy to move the seedlings to another tray after they have been growing for a while. However, they are separable which isn't always the case if you have all the plants in one container because the roots will tangle. I will slide the whole paper pot and seedling into a container if I want to sell it or give it to somebody. A big advantage is that when I plant the seedlings in the garden, I can leave the paper on or tear it off and let it rot right there. No large amounts of containers to pick up and wash if you want to use them for next year.