Summary

A bobble using the head of a model pig - see - http://www.thingiverse.com/thing:23029 - Lucky Pig. It is printed with PLA, a hard, rigid plastic, that makes a sensitive spring. The spring is a 3 dimensional version of Fermat's spiral, see - http://www.thingiverse.com/thing:1771653. OpenSCAD code is included.

Print Settings

Printer Brand:

MakerBot

                                            <p class="detail-setting printer"><strong>Printer: </strong>                     <div><p>MakerBot Replicator (5th Generation)</p></div></p>                                                                                <p class="detail-setting rafts"><strong>Rafts: </strong>                     <div><p>Yes</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>0.3 mm</p></div></p>                                                        <br>                        <p class="detail-setting notes"><strong>Notes: </strong>                    </p><div><p>The spring works well but cannot be constructed without support.  To avoid excess support use a high support angle, say 82 or 83 degrees.  Needle nose pliers can be used to remove most of the support; follow with tweezers for clean up.                          </p></div>

Changing the Head

Lucky_pig_head.scad takes lucky_pig_small.stl as input, extracts the head, and outputs lucky_pig_head.stl. Lucky_pig_bobble.scad takes lucky_pig_head.stl as input and outputs the bobble. Substitute an stl file of your choice for lucky_pig_small.stl to create your own head and pass it to lucky_pig_bobble.scad. Instructions are included in the openSCAD code.

Lucky Pig Bobble