A pen or pencil is inserted through the pen ball and is fixed in place by tightening a screw to allow for different pen sizes. The ball is held in the hand with the pen fixed to change the grip to be easier to write with. With different sizing available, this device works well with narrow writing utensils like paintbrushes or wider ones like sharpie markers. In addition, the device itself has alternate sizing to provide options for the user.
All documentation, design files, and photos can be found on the GitHub page that is linked at the top of this project page. The Maker Checklist document will aid you in following the correct steps to build and work with the requestor.
- 3D Printing
BILL OF MATERIALS
- 1x 3D Printed Pen Ball (Top and bottom)
- 5x M4 machine screws, 20 mm long* ($1.25 – $2.50) Link —or— Alternative Link
- 5x M4 hex nuts ($0.25) Link —or— Alternative Link
- 1x Writing utensil (pen, pencil, etc)
* Note that some printers are less accurate and M4 size hardware may not fit. It is recommended that you go to a hardware store and test different bolt sizes for the pen ball that is created.
* For the Smal Pen Ball, makers can use two M4 x 12mm or 16mm screws for the hardware holding in pen/pencil in place.
- 3D printer
There are small, medium, and large-sized pen balls available for different hand sizes. In addition, the pen hole diameter can also be changed from narrow, standard, and wide. By use of the set screw, the writing utensil does not need to be the exact size of the pen hole but rather the sizing is available to fit large writing devices like markers and narrow ones such as fine paintbrushes.
|Pen ball version||Pen hole size||Ball Diameter (mm)||Maximum Pen Hole Diameter (mm)|
|Small Pen Ball||Narrow||50||5|
|Medium Pen Ball||Narrow||60||5|
|Large Pen Ball||Narrow||70||5|
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