Hi guys, I am new to openscad and 3d printing. My first project will be a fan mount - to mount a 120mm fan on a 110mm outside diameter pipe. I have the fan mount set up but i wonder how I can design something that will reduce the square 120mm to 110mm round. Any ideas? -- View this message in context: http://forum.openscad.org/Square-to-round-transformation-tp14712.html Sent from the OpenSCAD mailing list archive at Nabble.com.

Taking the convex hull of a square and a cylinder will give you the basic shape. Then subtract a smaller version to hollow it out. On Nov 23, 2015 2:21 PM, "Sebastian Heyn" <sebastian.heyn@yahoo.de> wrote: > Hi guys, > > I am new to openscad and 3d printing. My first project will be a fan mount > - > to mount a 120mm fan on a 110mm outside diameter pipe. > > I have the fan mount set up but i wonder how I can design something that > will reduce the square 120mm to 110mm round. > > Any ideas? > > > > -- > View this message in context: > http://forum.openscad.org/Square-to-round-transformation-tp14712.html > Sent from the OpenSCAD mailing list archive at Nabble.com. > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >

 // Smaller cutout, to create the walls
 adapter(
     circleRadius = circleRadius,
     circleHeight = circleHeight,
     squareSize = squareSize,
     height = height,
     cutout = 1
 );

 // This extends the cylinder out the top, if that's desired
 translate([0,0,height]) cylinder(r=circleRadius, 

 // This extends the square portion below the part if we are a cutout
 if (cutout > 0) {
     translate([0,0,-cutout]) cube([squareSize.x, squareSize.y, 

Since getting started can be hard, here's a basic implementation of what it sounds like you want. Note that I didn't use your dimensions; you'll need to do plenty more work to make a usable part, but it should get you started. Good luck with your part. circleRadius = 50; circleHeight = 5; squareSize = [100, 100, 5]; height = 80; cutout = 0; wallThickness = 10; difference() { // Larger version of the part from which we will cut the hollow section, thus creating the walls adapter( circleRadius = circleRadius + wallThickness, circleHeight = circleHeight, squareSize = squareSize + [wallThickness*2, wallThickness*2, 0], height = height, cutout = 0 ); // Smaller cutout, to create the walls adapter( circleRadius = circleRadius, circleHeight = circleHeight, squareSize = squareSize, height = height, cutout = 1 ); } // A generic version of the part that we can reuse multiple times, both to create walls and if you wanted a different // sized version in the same SCAD file. module adapter( circleRadius, circleHeight, squareSize, height, cutout ) { // This creates the primary part -- the hull of a cylinder and a cube hull() { translate([0,0,squareSize.z/2]) cube(squareSize, center=true); translate([0,0,height-circleHeight]) cylinder(r=circleRadius, h=circleHeight, center=true); } // This extends the cylinder out the top, if that's desired translate([0,0,height]) cylinder(r=circleRadius, h=circleHeight+cutout, center=true); // This extends the square portion below the part if we are a cutout if (cutout > 0) { translate([0,0,-cutout]) cube([squareSize.x, squareSize.y, cutout+squareSize.z], center=true); } } > nop head <mailto:nop.head@gmail.com> > November 23, 2015 at 06:53 > > Taking the convex hull of a square and a cylinder will give you the > basic shape. Then subtract a smaller version to hollow it out. > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > Sebastian Heyn <mailto:sebastian.heyn@yahoo.de> > November 23, 2015 at 06:20 > Hi guys, > > I am new to openscad and 3d printing. My first project will be a fan > mount - > to mount a 120mm fan on a 110mm outside diameter pipe. > > I have the fan mount set up but i wonder how I can design something that > will reduce the square 120mm to 110mm round. > > Any ideas? > > > > -- > View this message in context: > http://forum.openscad.org/Square-to-round-transformation-tp14712.html > Sent from the OpenSCAD mailing list archive at Nabble.com. > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

or work on improving this one http://www.thingiverse.com/thing:1015874 -- View this message in context: http://forum.openscad.org/Square-to-round-transformation-tp14712p14729.html Sent from the OpenSCAD mailing list archive at Nabble.com.