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3D pen

A 3D pen is useful when you have a visual mind. It takes some practice. The filler and pen are more expensive but ar worth it. You can have filler in different colours but it takes time to change it. 

Filler not re-usable

More expensive

You have to know and feel figures for 3D drawings

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Easy technique for many forms

Colours can give an indication or specific look

Electricity, filler
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