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Mini desktop catapult

by guberti, published

Mini desktop catapult by guberti Apr 23, 2013

Description

This is a short-range catapult that was meant to be displayed on a desktop or other surface. It does work, but becase it was meant to be displayed, you need to push one end of the catapult to get it to shoot. This thing was made in OpenSCAD with the code below. If you enjoy, please like!
SCAD code:
difference()
{
union()
{
polyhedron(
points=[ [10,10,0],[10,-10,0],[-10,-10,0],[-10,10,0], // the four points at base

       [0,0,10]  ],                                 // the apex point   

triangles=[ [0,1,4],[1,2,4],[2,3,4],[3,0,4], // each triangle side

          [1,0,3],[2,1,3] ]                         // two triangles for square base  

);
translate([20,0,0])polyhedron(
points=[ [10,10,0],[10,-10,0],[-10,-10,0],[-10,10,0], // the four points at base

       [0,0,10]  ],                                 // the apex point   

triangles=[ [0,1,4],[1,2,4],[2,3,4],[3,0,4], // each triangle side

          [1,0,3],[2,1,3] ]                         // two triangles for square base  

);
translate([-10,-10,-20])cube([40,20,20]);
}
translate([0,-20,-15])cube([20,40,40]);
translate([-5,0,0])rotate([0,90,0])cylinder(30,2,2,$fn=100);
translate([-5,-2,0])cube([30,4,20]);
}
translate([40,20,-18])rotate([0,90,0])cylinder(30,2,2,$fn=100);
translate([55,30,-18])rotate([90,90,0])cylinder(41,2,2,$fn=100);
difference()
{
translate([55,-20,-18])sphere(10, $fn=100);
translate([45,-30,-15])cube([20,20,20]);
translate([55,-20,-18])sphere(9, $fn=100);
}
translate([20,-30,-19])sphere(9, $fn=100);

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If you have an idea for something you would like me to design and post on thingiverse, please tell me!

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Instructions

Supports are not neccisary, but rafts might be, depending on the 3D printer.

If you have an idea for something you would like me to design and post on thingiverse, please tell me!
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