Giha Woo designed a pen attachment that can help you draw straight lines. Called the “Constrained Ball”, this attachment can be easily attached on any pen and can help you draw straight lines, horizontally or vertically.
Giha Woo designed a pen attachment that can help you draw straight lines. Called the “Constrained Ball”, this attachment can be easily attached on any pen and can help you draw straight lines, horizontally or vertically.
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