Take your pen and write down its measurements like length, diameter etc.
Step 1: Drag a polygon and a hollow cylinder from the shapes.
Step 2: Align them together and group them.
Step 3: Drag a cylinder from shapes to make the inner part of the pen.
Step 4: Drag a hollow cylinder and place inside the solid cylinder as shown in figure. Leave bottom part of cylinder intact.
Step 5: Group them.
Step 6: Align both the shapes as shown to make the pen.
Step 7: Select the shape and adjust the dimensions according to your noted measurements.
Step 8: To make the front part of pen, drag a cone and place it as shown.
Step 9: Drag spiral from shape generators.
Step 10: Align them as shown below to create the inside spirals.
Step 11: Group them together.
Step 12: Increase the height of cylinder inside the pen case. Drag another spiral shape.
Step 13: Align them as shown and group them together.
Step 14: Now, drag another hollow cylinder.
Step 15: Align them as shown.
Step 16: Group them to create a hole.
Step 17: Finally, the pen is created.
Similarly, create pen-cap and other designs.