Extrude a cylinder from the side of another cylinder I'm trying to extrude a cylinder from the side of another cylinder. Imagine a 3D stick figure. I want to extrude the "arms" of the stick figure, but they need to also be cylinders. When I extrude, the sides of the extrusion are flat, like this:



I'm new to Blender, so there may be a simple solution... I just haven't been able to figure it out. Thanks for any help!
Maybe the easiest way is to use the Knife Project tool:


Duplicate the top of your cylinder, rotate the circle and make it another object.
Go in front view, select the circle, then the cylinder, and go in Edit mode.
Press the Knife Project button on the Tools panel (on your left, activated with T).
Now you have a circle marked on your cylinder. You can get rid of you circle object.
Delete the faces of this circle.
Extrude the edges.
Flatten on the Y axis with a SY0.
Fill the hole with F.
As it's better to only have quads, give an edge loop around the cylinder, use the knife: K to activate, Z to cut through, C to cut perpendicularly.
You have what you need (I guess).