Sliding Dovetail Demo (Customizable-ish)

This demonstrates a sliding dovetail joint created using the Round Anything library

It should be customizable....but there seem to be a few issues with Thingiverse SCAD. For one, it doesn't do good library support: https://www.thingiverse.com/groups/openscad/forums/general/topic:17694

Secondly, it doesn't do assert: https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/The_OpenSCAD_Language#assert

Thirdly, debugging scad over thingiverse is nearly impossible.

If you want custom dovetails, you'll have to compile the scad file yourself. I just learned that OpenSCAD has a built-in customizer: https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Customizer

The cool things about these dovetails is that they have configurable rounded edges for clearance in the corners. A simply defined dovetail with real materials would interfere in the corners, and the Round Anything library makes it easy to apply clearances in the corners. Note that rounding off the edges on the hole by negative radiuses on the ends of the hole-cutting differencing dovetail piece make the assembly easier to align and fir together.

Take care with elephant-foot and overextrusion in printing, and it should work well.

Code-wise it is this:

````
// Width of dovetail base
width = 10; // mm
// height of dovetail portion
height = 2; // mm
// length of sample
long = 20; // mm length of dovetail
// clearance between dovetail and slot
clearance = 0.5; // 0.1mm

// overlap tolerance for good surface intersections
tiny = 0.001; //

rotate([90,0,0]) // flip to x-y plane for printing
dovetail_demo(wide=width,high=height,long=long,clearance=clearance);

module dovetail_demo(wide=10,high=2,long=20,clearance=0.5){

translate([0,0,0])
dovetail(base=wide,height=high,length=long,rt=0,stubheight=2,center=true);

translate([2*wide,0,0])
difference(){
cube([wide+8*high,high*2,long]);
translate([4*high+wide/2,high-1,-tiny])
dovetail(base=wide+clearance,height=high,length=long+2*tiny,stubheight=2,center=true,rt=4,rf=-.5,rr=-.5);
}

}
module dovetail(base = 20,height = 5,length=10,angle = 45,stubheight=0.001,
rb=0.5,rt=0, rf=0.5,rr=0.5, center=false){
// this creates a dovetail shape
// rb is the bottom radius,
// rt radius of the top
// rf radius of the front (negative for chamfering in holes)
// rr radius of the rear (negative for chamfering in holes)
// stubheight
//

radiiPoints=[
    [0, 0,  rb   ],
    [base,  0,  rb],
    [base-height*cos(angle),  height,  rt],
       [base-height*cos(angle),  height+stubheight,  rt],
       [0+height*cos(angle),  height+stubheight,  rt],
    [0+height*cos(angle),  height,  rt  ]
];

translate([center?-base/2:0,0,0])
    polyRoundExtrude(radiiPoints,length,rf,rr,fn=20);

}
/////////////////
use // https://github.com/Irev-Dev/Round-Anything

````

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