This iPad stylus tool Is designed to fit over your finger, much like a thimble would for sewing. And you obviously can't 3D print the part where it touches the screen, so I will show you later what you can use, that is so easy to get and cheap too!
Step 1: The Base Cylinder
Next make a circle along the top, leaving a few mm for a wall.
Lastly, use the push /pull tool to extrude the circle all the way down leaving you with a hollow cylinder.
Step 2: Cone #1
Next click on the cone twice to reveal a settings icon, then click the shell icon. Choose a height and it will chop the top of the cone off (I used 8 as my height).
Then make a circle on the top of the cone (leaving a little bit left for walls). Then extrude it all the way through.
Finally, click the snap tool (magnet) and click the bottom of the cone and the top of the cylinder, they should align flush.
Step 3: The Connecting Peg
Then place it on top of the main shape and angle to your preference. (make sure it connects with the main body)
Step 4: Cone #2: The... Er Screen Toucher Holder
Then use the shell tool to chop off the cone's top.
Lastly, make a circle allitle smaller than cone's top and extrude it, BUT NOT ALL THE WAY!
Then you can attach it to the connecting peg (looks best at an angle).
Step 5: Finished Product
So your probably wondering what your going to use to touch the screen, well something I've tried that works really good is a standard dishwashing sponge.
Please vote and I'll post another instructable on the finished product.
This is my first instructable so let me know how I did in the comments.