Parametric Funnel Generator

Need a funnel for one specific bottle, container, machine, fluid, powder, seed, pellet, or other oddly sized opening? This generator lets you create one instead of digging through drawers full of funnels that are somehow all the wrong size.

Adjust the funnel bowl, outlet, wall thickness, spout length, taper, and bend geometry to create everything from a basic straight funnel to a long offset funnel with two smooth bends. The default two-bend setup curves away from the center and then bends back so the final outlet points straight down again.

Everything is generated as one continuous model with a smooth internal flow path.

🔧 Funnel Body Controls

Setting	What It Does
Top Opening Diameter	Controls the inside diameter of the large funnel opening.
Outlet Diameter	Controls the inside diameter where the funnel bowl transitions into the spout.
Funnel Height	Changes the height and steepness of the funnel bowl.
Wall Thickness	Controls the thickness of the funnel body and spout walls.
Top Rim	Turns the reinforced rim around the top opening on or off.
Rim Height	Controls how tall the rim extends above the funnel body.
Rim Thickness	Controls how far the rim extends outward.

📏 Spout Controls

Setting	What It Does
Spout Length	Controls the total centerline length of the complete spout, including all straight and curved sections.
Spout Style	Selects a straight-diameter or tapered spout.
Spout End Diameter	Controls the outlet diameter at the very end when a tapered spout is selected.
Spout Path	Selects a straight spout, one bend, or two bends.

The spout length is measured along the entire path, not just vertically from the funnel. Increasing a bend angle or radius uses more of the selected spout length.

↪️ First Bend Controls

Setting	What It Does
First Bend Start Distance	Controls how far the spout travels straight down before the first bend begins.
First Bend Angle	Controls how far the first bend turns away from vertical.
First Bend Radius	Controls how tight or wide the first curve is.
First Bend Direction	Selects whether the spout bends left or right.

A larger bend radius creates a smoother, wider curve. A smaller radius creates a tighter elbow.

↩️ Second Bend Controls

Setting	What It Does
Distance Between Bends	Controls the straight section between the end of the first bend and the beginning of the second.
Second Bend Angle Mode	Selects whether the second bend automatically matches the first bend or uses a custom angle.
Second Bend Angle	Controls the second bend angle when Custom mode is selected.
Second Bend Radius	Controls how tight or wide the second curve is.
Second Bend Direction	Selects whether the second bend continues in the same direction or bends back the opposite way.

Match First Mode

When the second bend is set to Match First and the direction is set to Opposite, the second bend automatically cancels the angle of the first bend.

For example:

First bend: 55° right
Second bend: 55° left
Final outlet direction: straight down

This creates an offset spout while keeping the outlet vertical.

Custom Mode

Select Custom to control the second bend independently. This allows the final outlet to point inward, outward, sideways, or at any angle between the available limits.

🛡️ Automatic Geometry Protection

The generator automatically checks the selected measurements and adjusts impossible combinations that would otherwise create broken geometry.

This includes:

Bend angles that consume more than the available spout length
Bend start distances that are too long
Excessive spacing between the bends
Bend radii that are too tight for the selected spout size
Negative final straight sections
Invalid outlet or wall-thickness combinations

Any automatic adjustments are shown in the OpenSCAD console so you can see which setting was limited.

💡 Possible Uses

Automotive fluid funnels
Oil and coolant funnels
Bottle filling
Powder transfer
Seed and pellet funnels
Resin and paint transfer
Workshop machines
Aquarium equipment
Kitchen containers
Hard-to-reach fill ports
Offset container openings
Custom replacement funnels

Because every dimension is adjustable, the same generator can create a small precision funnel or a large workshop funnel.

📐 Design Notes

The curved spout is generated as one continuous swept tube. Both the inside and outside follow the same centerline path through the straight sections and bends.

This creates:

Smooth internal transitions
Consistent wall thickness
No sharp joints between sections
One continuous watertight model
Proper tapered geometry through the curves

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