Reflections on a Bottle Opener: Part II

Unfortunately, when I came to the engineering lab to continue the bottle opener design on Friday, I discovered that my partner had dropped the class.  I had just begun to attempt to draw the bottle opener in SolidWorks, and Dana joined me as my partner for its completion.  Together we struggled to enforce the correct relations between the partial ellipses we used for the finger holds--while we knew how to put most things together, attempting to delete the guide ellipse we had drawn proved more difficult than expected.
Things went awry:

With the help of our many TAs we finally managed to complete the sketch and print out the bottle opener with the laser cutter.
The final sketch:

The final Delrin model:

 Success!

In the end, the bottle opener worked spectacularly well.  Our only minor issue was a slight discrepancy between the Delrin part and the foam core model; estimation with the ruler on the laser cutter screen proved less accurate than we had hoped.  However, the part was still comfortable to hold and easy to use with right or left hand, and but for an almost-imperceptible chipping of part of the center ellipse the bottle-opener remained unscathed after popping the cap off at least 5 bottles.  Given our opener's success, we would change only the sizing, by using Smart Dimensions in SolidWorks to specify the exact diameter desired.  All in all, our bottle opener was an exciting accomplishment to begin a semester of cool projects!