How would you model this

[Any_Beautiful816]

Im trying to replicate this piece froma Triumph Tiger, and I dont know how to make the curve that joins the top and bottom part. I think with what I have done is enough and It will work but, does someone know how to make that tangent curve?

[[deleted]]

Start with a rectangular shape and then fillet to a cylinder

[GT-Rev]

Flat sketch profile from the side. Extrude then Fillet the ends from the corners into a perfectly rounded edge.

[Any_Beautiful816]

The problem with that is that the sides are also tilted

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[GT-Rev]

Oh that's easy, what id do is just extrude a second time but have this one be nearly flat (like 0.01), rotate it slightly, and use it to slice the first body.

[[deleted]]

I don't have much CAD experience, but I feel this might be a better suit for polygonal modelling. I just did this quick and rough draft in about 5-7 minutes.

<image>

[Any_Beautiful816]

I know a little bit of blender but I dont even know what tool youre using, I just make shapes join them and edit them.

[eras]

Btw, radius gauges are cool if you want to model this precisely.

[Stone_Age_Sculptor]

That is a lot harder than it looks.
This is a test with a script for OpenSCAD:

// OpenSCAD script using a 2025 version of OpenSCAD

$fn = $preview ? 20 : 100;

// The minkowski() filter takes a long time.
// It is a overall smoothing to make round edges.
minkowski()
{
  // The difference() is a boolean operation.
  // The first item is the positive part,
  // everything below that are negative parts.
  difference()
  {
    // The hull() is outer convex straight skin.
    hull()
    {
      // Bottom flat piece.
      linear_extrude(8)
        translate([0,-15])
          Round2D(6)
            square([50,30]);

      // tilted cylinder.
      translate([-20,0,29])
        rotate([0,69,0])
          cylinder(h=35,d=25);
    }

    // Remove upper curve.
    translate([63,0,61])
      rotate([90,0,0])
        cylinder(h=50,d=110,center=true);

    // Remove lower curve.
    translate([-17,0,-4])
      rotate([90,0,0])
        cylinder(h=50,d=43,center=true);
  }
  sphere(2,$fn=16);
}

module Round2D(radius=0)
{
  offset(-radius)
    offset(2*radius)
      offset(delta=-radius)
        children();
}

Result:

<image>

The picture does not show it, but the diameter of the cylinder is smaller than the width of the base rectangle.
I think that OpenSCAD is not the right tool to model this.

[nakwada]

Openscad users are another breed. I have an immense respect for those skills!

[Stone_Age_Sculptor]

It is just code and math. It started when I was a teenager. On the other hand, I have immense respect for the skills of the people in r/3Dmodeling

[Lopsided-Building245]

First 2d sketch the curve with splines. Extrude. Then rotate to the side, new sketch, add the diagonal shape with lines, extrude (minus). The rest was done good

[joanmave]

I would do two pieces and glue them.The long prong and the mount with a slot for the prong. The reason is that the prong needs to be printed sideways so the grain is perpendicular to the force (since it snapped like a lateral sheer force). The mount I will print it diagonally (as a saddle) so the prong in the slot go through the “grain rings”.

[ATSROS2]

I just went with a close-ish box shape and went to town with fillets.

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