Instructables
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Grapho-Sphere translates to 'Writing-Ball' and is an assistive writing tool for persons who cannot fully move digits in hand, do have some gross motor skills but lack ability to develop fine motor skills and have cognitive ability and desire to sign own name when required to do so.

Materials:
Foam of desired density (I’m using a foam football that was perfect)
Large bread knife
Small paring or steak knife
Pen/marker
Tape measure/ruler
Index card
Scissors
Small stick/toothpick (I used a small Alen Key)

Individual A (person for who i made the tool):
Can’t grasp a pencil/pen
Can loosely grasp a large marker
Can (due to resistance in hand function and foam density) hold a soft rubber/foam ball

Depending on a persons degree of ability the ball can be made with different foam densities. I chose a medium soft foam for the individual after having them test it out.

Also pictured are my original sketches.

 
 
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Step 1: Measure & Divide

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First I measured the palm of the persons hand that I was designing the tool for. It was 3 inches.

I then marked the 3 inches onto the index card and made a 3x3 square.

I cut the football in half between the middle to laces, I sawed with the bread knife. 

Step 2: Cut

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Once in half I used the 3x3 card to trace a square on the newly cut face on the football. Now we’re only using half of the football so the other half can be put aside to be used later.

Now I cut along the squares lines towards the point of the football, as straight as I could. I came out with an angled rectangle.
 
I then placed the 3x3 card on the rectangle, starting at the front where we first cut our football in half, and traced another square. I cut off the end of the football.
looks good. i saw this and imagined that Oogoo could be used. Its a sugru substitute.
Mplinnc3 years ago
FUNNY!!!!!!!!!!!

I have the same pen as you


these things are getting pretty popular
PKM3 years ago
Now I think about it there are all sorts of everyday tools with narrow handles that this could work for- cutlery, toothbrushes, paint brushes- none of which would be very fun to use if you had restricted movement in your fingers.

I'll remember this for if my desk job ever gives me RSI!
ryegem (author)  PKM3 years ago
I have actually had it used with a paint brush for a young child with CP! HE LIT UP SO MUCH WHEN HE COULD FINALLY PAINT!! :)
canida ryegem3 years ago
excellent story!
canida3 years ago
Very nice!

It would be helpful if you put a picture of the finished writing aid as the Intro image, as it's the one that shows up everywhere. It took me a while to scroll down and see what you were making.
ryegem (author)  canida3 years ago
Ah, yes that would make sense! Lol, thank you.

Done and Done! :)
canida ryegem3 years ago
Thanks!
Love seeing ingenious assistive devices. Well done!
Servelan3 years ago
Very cool idea! Someone who's had carpel tunnel or other surgery or arthritis could benefit from this.