Headless Gourd Shaped Concert Ukulele

prusaprinters

<p>An example of 3D model generated with my Gugulele OpenSCAD script… (see <a href="https://github.com/bguan/gugulele">https://github.com/bguan/gugulele</a>).</p> <ul> <li>Decorative headless unibody gourd shaped design</li> <li>Single rectangular through-body spine</li> <li>Single oval off center sound hole</li> <li>T-Bracing</li> <li>Tail-end placement of Planetary tuners</li> <li>3 pieces using M1.6 socket head screws or M2 self tapping wood screws</li> </ul> <p>You can hear me playing the fully assembled unit in this demo youtube video: <a href="https://youtu.be/wjND_2x5BcE">https://youtu.be/wjND_2x5BcE</a></p> <p>Third Party Parts:</p> <ul> <li>Spine/rods e.g. <a href="https://dragonplate.com/ecart/product.asp?pID=749&amp;cID=20">https://dragonplate.com/ecart/product.asp?pID=749&amp;cID=20</a><ul> <li>get a 24" long and cut it down to size, can't remember exactly...</li> <li>if you don't use a rod, the neck will bow under string tension</li> </ul> </li> <li>Gotoh UPT-UBB-B Tuners e.g. <a href="http://www.theukulelesite.com/gotoh-upt-tuner-upgrade.html">http://www.theukulelesite.com/gotoh-upt-tuner-upgrade.html</a><ul> <li>its possible to use cheaper friction tuners, but need to play with shims and washers like this user <a href="/make:325819">http://www.thingiverse.com/make:325819</a></li> <li>he uses https://www.amazon.com/gp/product/B002HFQ88Y</li> </ul> </li> <li>Screws (M1.6x12) for fretboard long holes e.g. http://www.amazon.com/dp/B00XP4OD5Q<ul> <li>can't remember how many you need, just buy a bag of 100</li> </ul> </li> <li>Screws (M1.6x4) for bridge and fretboard short (mid-line) holes e.g. https://www.amazon.com/dp/B00XP4ZWY2<ul> <li>can't remember how many you need, just buy a bag of 100</li> </ul> </li> <li>Lately I've been using M2 wood screws like these https://www.amazon.com/gp/product/B01MTKUV85</li> </ul> <p>I printed this on big delta style printers, the model is oriented pointing up, like a flower vase. I use 100 micron, 33% lattice infill.</p> <h3>How I Designed This</h3> <p><strong>OpenSCAD programming!</strong></p> <div><p>The hardest part for me is to deal with the lack of spline in OpenSCAD. I have to subtract scaled arc from rectangle and revolve it to get to a funnel shape for the shoulder, and similarly scaled different quadrants of sphere to get an ellipsoid. Also due to "functional" nature of OpenSCAD, I have to contort the fret calculation by using some crazy recursive function. Filleting also is a challenge as I have to accomplish that with Minkowski sum of small sphere<br/> and the main parts with sharp edges. <p>The most painful part is that OpenSCAD is painfully slow when rendering at high resolution, as it is single threaded and not utilizing GPU unlike professional 3D CAD tools. I intend to port the script to a different language/tech someday e.g. OnShape Feature Script.</p> </p></div> Category: 3D Printing