How do you achieve this effect, I tried the 3D effect but I wasn't able to get the same results with it.
I also tried the pen tool but again wasn't successful at it.
I am using Adobe Illustrator.
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Notice how all lines are either vertical or rotated 45°. This image follow a regular square grid, so it's easy to construct manually.
Enter Edit > Preferences > Guides & Grid to set up the grid as you prefer. (Here I'm in a print document and have set Grid > Gridline every to 10 mm.)
Make sure the grid is visible with View > Show Grid.
Make sure everything snaps to the grid by turning on View > Snap to Grid.
Select a black stroke and no fill.
Select a proper stroke width and make sure the caps are set to Round Cap so the ends of all lines fit neatly together.
Select the Line Segment Tool and simple draw the shape line by line. (For each line I draw, I Ctrl + left click the artboard to deselect the last line.)
(By the way, notice how this object isn't fully closed and thereby isn't really a well-defined 3D object, but has a bit of optical illusion to it.)