I don’t use Fusion 360 or Blender for functional 3D prints.

I write code instead.

Why OpenSCAD?

OpenSCAD is a programmer’s CAD tool. You describe geometry with code, not mouse clicks. That sounds backwards until you need to:

• Adjust 20 parameters across a design
• Reuse patterns in multiple projects
• Version control your models
• Generate variants programmatically

Then code-based CAD makes sense.

The Paradigm Shift

GUI CAD: Click, drag, extrude, fillet. Make a thing. Want to change it? Click through the same steps again.

OpenSCAD: Write functions. Define parameters. Generate geometry. Want changes? Edit variables. Re-render.

It’s the difference between Photoshop and CSS. One is immediate but brittle. The other is abstract but scalable.

Real Example: Parametric Box

I needed storage boxes for van organization. Different sizes, same mounting system.

In Fusion 360: Design one. Manually adjust dimensions. Export. Repeat 8 times.

In OpenSCAD:

module storage_box(width, depth, height, wall=2) {
    difference() {
        // Outer shell
        cube([width, depth, height]);
        
        // Hollow interior
        translate([wall, wall, wall])
            cube([width-2*wall, depth-2*wall, height]);
        
        // Mounting holes
        for (x = [10, width-10])
            for (y = [10, depth-10])
                translate([x, y, 0])
                    cylinder(h=wall*2, r=2, $fn=30);
    }
}

// Generate multiple sizes
storage_box(100, 80, 60);
translate([120, 0, 0]) storage_box(150, 100, 80);
translate([0, 120, 0]) storage_box(80, 80, 40);

Change wall thickness? One variable. Add rounded corners? One function call. Generate 10 variants? One loop.

Modules Are Libraries

The power is in reusable components:

// rounded_box.scad
module rounded_box(w, d, h, r) {
    hull() {
        for (x = [r, w-r])
            for (y = [r, d-r])
                for (z = [0, h-r])
                    translate([x, y, z])
                        sphere(r=r, $fn=30);
    }
}

// mounting_holes.scad
module mounting_holes(w, d, hole_size=3, inset=10) {
    for (x = [inset, w-inset])
        for (y = [inset, d-inset])
            translate([x, y, 0])
                cylinder(h=100, r=hole_size/2, $fn=20, center=true);
}

Now every project can import these:

use <rounded_box.scad>
use <mounting_holes.scad>

difference() {
    rounded_box(100, 80, 60, 5);
    mounting_holes(100, 80);
}

Build a library once. Use it forever.

The Git Advantage

OpenSCAD files are text. That means:

• Version control — Git tracks every change
• Diffs — See exactly what changed between versions
• Branching — Try variants without breaking the original
• Collaboration — Share code, not binary files

I have a 3d-models repo with years of designs. I can search it, diff it, branch it. Try doing that with .f3d files.

Parametric Patterns

The “why” of OpenSCAD is parametric design. Not just adjustable dimensions, but relationships between parts.

Example: Gear system

module gear(teeth, thickness) {
    pitch = 360 / teeth;
    radius = teeth * 2;  // Simplified
    
    cylinder(h=thickness, r=radius, $fn=teeth);
}

// Two gears that mesh
gear(20, 5);
translate([44, 0, 0])  // Distance calculated from teeth
    gear(20, 5);

Change teeth on one gear? The spacing auto-adjusts. The relationship is preserved.

This scales to complex assemblies. Define constraints once, generate geometry automatically.

Real Projects

Things I’ve designed in OpenSCAD:

Van organization: Drawer dividers, tool holders, cable management clips MagHugg products: Packaging jigs, assembly fixtures, QC templates Electronics enclosures: Raspberry Pi cases, sensor mounts, custom PCB holders

None are artistic. All are functional. That’s the use case.

The Learning Curve

OpenSCAD is simple but weird:

Simple: Only a few primitives (cube, sphere, cylinder) and operations (difference, union, intersection)

Weird: No mouse. No visual feedback until render. Bugs are invisible until you export.

If you’re a coder, the paradigm clicks fast. If you’re a designer, it’s frustrating.

Workflow

My actual process:

1. Sketch on paper — rough dimensions, constraints
2. Write base module — parametric, no hard-coded numbers
3. Iterate in OpenSCAD — adjust variables, preview (F5)
4. Full render — CGAL render (F6) to check geometry
5. Export STL — slice in PrusaSlicer
6. Test print — check fit, adjust parameters
7. Commit to Git — version for future use

The cycle from idea to printed part is about 30 minutes for simple designs. Complex assemblies take a few hours.

When NOT to Use OpenSCAD

Organic shapes — Sculpting, characters, artistic designs. Use Blender.

Surface modeling — Complex curves, automotive bodies. Use Fusion 360.

Quick one-offs — Need something now, don’t care about reuse? Tinkercad is faster.

OpenSCAD shines for functional, parametric, reusable designs. If you don’t need those qualities, use something else.

Integration with Automation

Because OpenSCAD is code, I can automate it:

#!/bin/bash
# Generate 5 box sizes from parameters
for size in 50 75 100 125 150; do
    openscad -o "box_${size}mm.stl" \
        -D "width=$size" \
        -D "depth=$size" \
        -D "height=$((size/2))" \
        storage_box.scad
done

This generates 5 STL files programmatically. Try that in a GUI tool.

I have scripts that bulk-generate variants, batch export, and auto-slice for printing. The whole pipeline is automated.

The ADHD Angle

For my ADHD brain, code-based CAD works because:

1. No lost work — Everything is versioned, nothing disappears
2. Reusable patterns — I don’t re-solve the same problems
3. Search beats memory — Grep my library instead of remembering
4. Automation > repetition — Scripts handle tedious tasks

GUI tools require too much clicking. Too many steps to recreate designs. Code is grep-able, diff-able, automatable.

Resources

If you want to learn OpenSCAD:

• Official cheat sheet — All functions, one page
• OpenSCAD.org tutorials — Start here
• Thingiverse OpenSCAD designs — Read other people’s code
• My approach — Start with a real need, not a tutorial

The best way to learn is to need something, design it, print it, iterate.

The Takeaway

OpenSCAD isn’t for everyone.

But if you think in code, want parametric designs, and value reusability over immediacy, it’s the right tool.

I can generate 50 variants of a part in the time it takes to model one in Fusion 360. I can grep my entire library for “mounting hole patterns” and reuse them instantly.

That’s worth the learning curve.

Plus, when your design files are text, they work with the same version control as everything else. One Git repo, all my projects.

That’s how I like to work.