Odin's spear Gungnir

prusaprinters

<p>For my son's "Historical Halloween" annual school event (this year's theme was Europe), my son chose to be Odin, the father of the Norse gods. This is one of his costume props, safe for school, with no sharp points or edges.</p><p>Most people know about Thor's hammer "Mjolnir", but not as many know that his father Odin has a spear "Gungnir". Some traditional accounts say that Gungnir never misses its target, even if it must pass through solid objects. And, just like Thor's hammer, Gungnir always returns to its wielder.</p><p>This spear blade is designed to screw onto a standard broom handle. The blade design is patterned after a real metal-blade design by <a href="https://www.viking-store.com/blogs/norse/gungnir">The Viking Woodsmith</a>. Historical records say that runes were carved on the blade, but the records don't say what the runes were. The runes on this spear spell "Gungnir" in Futhark.</p><p>The OpenSCAD script Odin_spear.scad requires scripts from two of my other Things: geodesic_hemisphere.scad from <a href="https://www.prusaprinters.org/prints/129119-geodesic-hemisphere-with-regular-polygon-equator">Geodesic hemisphere with regular polygon equator</a> and circlestack_thread3.scad from <a href="https://www.prusaprinters.org/prints/129114-nutsbolt-baby-dexterity-toy">Nuts&amp;bolt baby dexterity toy</a>. All the necessary .scad files are included in this Thing.</p><h3>Print Settings</h3><p><strong>Printer Brand: </strong>Prusa</p><p><strong>Printer: </strong>I3 MK3S</p><p><strong>Supports: </strong>No</p><p><strong>Resolution: </strong>0.20 mm layers</p><p><strong>Infill: </strong>20% cubic</p><p><strong>Filament:</strong> Prusament PLA Silver-gray</p><p><strong>Notes:</strong></p><p>All parts are included in one STL file. If you need to print one part, use your slicer to split it into separate objects and print only what you need.</p><p>The blade halves are 240mm long, designed to fit on the build plate of a Prusa i3 MK3S printer, which is 250mm wide, with enough room for a 4mm brim to prevent the parts from warping away from the build plate.</p><p>If your build plate is smaller, and a blade would fit diagonally on your build plate, then split the STL into separate objects in your slicer, delete all objects except one blade half, and print one blade half at a time, oriented diagonally.</p><h3>Post-Printing</h3><ol><li>Push the two alignment pins into the holes in one of the blade halves.</li><li>Test the fit by assembling the two halves together and inserting the blade into the broomstick socket. You may have to sand the inside of the socket and outside of the blade insert a little bit. The fit should be snug.</li><li>If printing with PLA, the blade halves can be glued with acetone or superglue. Superglue is probably best. Just a couple of drops in the middle and one near the tip is sufficient.</li><li>Clamp the blade halves together (or wrap rubber bands around them) and insert the blade halves into the broomstick stocket. The socket holds the back end together while the glue cures.</li><li>After the blade glue cures, pull it partway out of the socket and add a drop of glue to the outside of the inserted part, then push it back into the socket.</li></ol><h3>How I Designed This</h3><p>Designed completely in OpenSCAD, unlike <a href="https://www.prusaprinters.org/prints/129111-king-kamehameha-i-spear-head">my son's previous spear wielded by Hawaiian King Kamehameha I</a>, which was done in Tinkercad. I am particularly pleased with the ogive curves I made for the leading edge of Odin's spear.</p><p>&nbsp;</p><p>Category: Props</p>