Summary

I rebuilt the cool kendama model by TimeFramed in OpenSCAD then altered the model:

Widened the slots so that no filing is necessary
Reduced some of the angles for smoother surfaces
Widened the holes for thicker string
Added 13 stars at the top of the ball

Then I used the Prusa color print web site to add color change stops to the gcode. The printed ball resembles a US flag.

http://prusaprinters.org/color-print/

Print Settings

Printer Brand:

RepRap

                                            <p class="detail-setting printer"><strong>Printer: </strong>                     <div><p>Original Prusa i3</p></div></p>                                                                                <p class="detail-setting rafts"><strong>Rafts: </strong>                     <div><p>No</p></div></p>                                                                                <p class="detail-setting supports"><strong>Supports: </strong>                     <div><p>Yes</p></div></p>                                                                                <p class="detail-setting resolution"><strong>Resolution: </strong>                     <div><p>0.25mm</p></div></p>                                                                                <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>25%</p></div></p>                                                        <br>                        <p class="detail-setting notes"><strong>Notes: </strong>                    </p><div><p>The ball is a combination of PETG colors; the stick is UV reactive PLA. eSun claims the filament changes to red but it actually changes to pink. See the pictures.</p></div>

Kendama in OpenSCAD