Another way is to use a plane and bevel it in edit mode. I can do the following steps in about 10 seconds (including the time to start and stop the timer).

1. Add plane (⇧ ShiftA > Mesh > Plane):

2. Switch to edit mode (↹ Tab), select one edge (A > deselect all, B > border select), and extrude it upwards (E):

3. Select the corner edge again (A to deselect all, B for border select)

3. Bevel with CtrlB. Use the keyboard or the scrollwheel to set the number of segments:

4. Shade smooth.

Example (click the gif for a video version which can be slowed down):

Convenience:

If you find your self creating these objects for what seems like every other project, you could either:

• Make a primitive out of it with the CreaPrim addon so it's available in the Add mesh menu. (See this answer for instructions)

or:

• Include one in your startup.blend on a separate layer (this is what I did):

1. Open a new file

2. Create the "bent plane" object and optionally move it to another layer.

3. Save the startup.blend (CtrlU). Note that this will save everything (view angle, materials, objects, user preferences, etc.) as it is as the way blender will start in the future.
   See this question for more information.

Another way is to use a plane and bevel it in edit mode. I can do the following steps in about 10 seconds (including the time to start and stop the timer).

1. Add plane (⇧ ShiftA > Mesh > Plane):

2. Switch to edit mode (↹ Tab), select one edge (A > deselect all, B > border select), and extrude it upwards (E):

3. Select the corner edge again (A to deselect all, B for border select)

3. Bevel with CtrlB. Use the keyboard or the scrollwheel to set the number of segments:

4. Shade smooth.

Example (click the gif for a video version which can be slowed down):

Convenience:

If you find your self creating these objects for what seems like every other project, you could either:

• Make a primitive out of it with the CreaPrim addon so it's available in the Add mesh menu. (See this answer for instructions)

or:

• Include one in your startup.blend on a separate layer (this is what I did):

1. Open a new file

2. Create the "bent plane" object and optionally move it to another layer.

3. Save the startup.blend (CtrlU). Note that this will save everything (view angle, materials, objects, user preferences, etc.) as it is as the way blender will start in the future.
   See this question for more information.

Another way is to use a plane and bevel it in edit mode. I can do the following steps in about 10 seconds (including the time to start and stop the timer).

1. Add plane (⇧ ShiftA > Mesh > Plane):

2. Switch to edit mode (↹ Tab), select one edge (A > deselect all, B > border select), and extrude it upwards (E):

3. Select the corner edge again (A to deselect all, B for border select)

3. Bevel with CtrlB. Use the keyboard or the scrollwheel to set the number of segments:

4. Shade smooth.

Example (click the gif for a video version which can be slowed down):

http://giant.gfycat.com/RingedAjarHen.gif

Convenience:

If you find your self creating these objects for what seems like every other project, you could either:

• Make a primitive out of it with the CreaPrim addon so it's available in the Add mesh menu. (See this answer for instructions)

or:

• Include one in your startup.blend on a separate layer (this is what I did):

1. Open a new file

2. Create the "bent plane" object and optionally move it to another layer.

3. Save the startup.blend (CtrlU). Note that this will save everything (view angle, materials, objects, user preferences, etc.) as it is as the way blender will start in the future.
   See this question for more information.

Another way is to use a plane and bevel it in edit mode. I can do the following steps in about 10 seconds (including the time to start and stop the timer).

1. Add plane (⇧ ShiftA > Mesh > Plane):

2. Switch to edit mode (↹ Tab), select one edge (A > deselect all, B > border select), and extrude it upwards (E):

3. Select the corner edge again (A to deselect all, B for border select)

3. Bevel with CtrlB. Use the keyboard or the scrollwheel to set the number of segments:

4. Shade smooth.

Example (click the gif for a video version which can be slowed down):

Convenience:

If you find your self creating these objects for what seems like every other project, you could either:

• Make a primitive out of it with the CreaPrim addon so it's available in the Add mesh menu. (See this answer for instructions)

or:

• Include one in your startup.blend on a separate layer (this is what I did):

1. Open a new file

2. Create the "bent plane" object and optionally move it to another layer.

3. Save the startup.blend (CtrlU). Note that this will save everything (view angle, materials, objects, user preferences, etc.) as it is as the way blender will start in the future.
   See this question for more information.

Another way is to use a plane and bevel it in edit mode. I can do the following steps in a about 10 seconds (including the time to start and stop the timer).

1. Add plane (⇧ ShiftA > Mesh > Plane):

2. Switch to edit mode (↹ Tab), select one edge (A > deselect all, B > border select), and extrude it upwards (E):

3. Select the corner edge again (A to deselect all, B for border select)

3. Bevel with CtrlB. Use the keyboard or the scrollwheel to set the number of segments:

4. Shade smooth.

Example:

Convenience:

If you find your self creating these objects for what seems like every other project, you could either:

• Make a primitive out of it with the CreaPrim addon so it's available in the Add mesh menu. (See this answer for instructions)

or:

• Include one in your startup.blend on a separate layer (this is what I did):

1. Open a new file

2. Create the "bent plane" object and optionally move it to another layer.

3. Save the startup.blend (CtrlU). Note that this will save everything (view angle, materials, objects, user preferences, etc.) as it is as the way blender will start in the future.
   See this question for more information.

Another way is to use a plane and bevel it in edit mode. I can do the following steps in about 10 seconds (including the time to start and stop the timer).

1. Add plane (⇧ ShiftA > Mesh > Plane):

2. Switch to edit mode (↹ Tab), select one edge (A > deselect all, B > border select), and extrude it upwards (E):

3. Select the corner edge again (A to deselect all, B for border select)

3. Bevel with CtrlB. Use the keyboard or the scrollwheel to set the number of segments:

4. Shade smooth.

Example (click the gif for a video version which can be slowed down):

http://giant.gfycat.com/RingedAjarHen.gif

Convenience:

If you find your self creating these objects for what seems like every other project, you could either:

• Make a primitive out of it with the CreaPrim addon so it's available in the Add mesh menu. (See this answer for instructions)

or:

• Include one in your startup.blend on a separate layer (this is what I did):

1. Open a new file

2. Create the "bent plane" object and optionally move it to another layer.

3. Save the startup.blend (CtrlU). Note that this will save everything (view angle, materials, objects, user preferences, etc.) as it is as the way blender will start in the future.
   See this question for more information.