Constrained Ball: Easy to Draw Straight Lines

| 6 Comments
constrained000.jpgWanting to draw a straight line easily?  Here's a nice design by Korean product designer Giha Woo.  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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It's a small attachment with a very simple design and an attractive look.

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The constrained ball lets you draw straight lines vertically, horizontally and even diagonally with one sweeping motion with any pen.  It can also be used to measure a length of line which is clearly indicated on the tip.

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Because of its adjustable rubber lining, any size of pen can easily be attached to this.

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Seen above, the constrained ball product easily follows the line on the graph and indicates the length of the line already drawn.

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You can use it to underline your notes neatly.

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The constrained ball, a very useful product design that can be used by architects, designers, students, and just about anyone who needs to draw a straight line.

Who needs a ruler with a pen attachment like this.  It draws and it measures!

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6 Comments

Good idea but I would love to check in real life how is it working!

Please if any body know where can I buy it, let me know.
Also I wanna know how much it is?

If anybody actually used a pencil to design anything anymore, they would use a rule or a drafting table. This is just stupid. If it was a real product it wouldn't sell because it is a stupid useless product that wouldn't even work well. It's actually kind of ironic because somebody used a computer to design and render this "product" and never once put pencil to paper to design it!!! Don't thumb up this crap

The line won't be straight!!

@cooper, nice.

also their comment 'Who needs a ruler with a pen attachment like this. It draws and it measures!'

It draws and it measures, so does a pen with a ruler, also the ruler can be pushed away unlike this stupid idea which has to be removed from the pen which can become a hassle.

This will only go in a straight line if you point it in one which is hard to determine unlike a ruler which shows you where the line will go and what it will look like.

It seems that this is constricted to centimetres which many people who actually care about straight lines (designers structural drawers etc) would not use when given the option of a more precise measurement like millimetres.

It looks it you wanted to draw a line down whether it be straight or not you must angle the pen or remove this Constrained Ball. Or turn the page which is not always so simple.

This looks like it could snap under pressure at the joint, the wheel could come off and me pen might not fit (pencils are thinner than most pens) meaning your at a loss and out of pocket.

Now a rule is a simple device with many different uses and scales. They do not tent to break with many different types and materials available at a low cost. Also they are slim and can be out in a pocket with a pencil like I do.

I do have a lot more to say on this but I think this is enough for today. Your Constrained Ball is epically bad and flawed in many ways. Why did you not think of this when designing it, where practical use of the product not in your mind or brief.

The Constrained Ball is a FAIL

Ruler and Pencil FTW.

Cheers, Pawn
BTW I'm no expert just an average Joe and I can see the flaws.

correct me if i'm wrong, but doesn't angling a wheel make it not go in a straight line? it seems like one would be fighting the wheel to try and draw a line.

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