Learn OpenSCAD: Accessible 3D Design for Blind and Sighted Makers

OpenSCAD is the most accessible 3D design tool I have found so far as a blind maker. Instead of clicking, dragging and visually adjusting shapes, I build models by writing code. That means the design can be read, edited, searched and understood with a screen reader.

I am Edis, and OpenSCAD has become one of the main tools behind my 3D printing work. This is not a complete manual. It is a practical introduction to why I use it, how it works and why text-based CAD can be useful for blind and sighted makers.

Why I use OpenSCAD

Many CAD programs are built around a visual workspace. That can work well if you use a mouse and can see the model clearly, but it creates barriers when you rely on a screen reader.

OpenSCAD works differently. I describe the object in text. A cube has dimensions. A cylinder has a radius and height. A part can be moved, rotated, copied or subtracted using commands. That makes the design process more precise and more accessible for me.

What makes OpenSCAD different

• I can write designs as plain text.
• I can use a keyboard and screen reader instead of a mouse.
• I can change measurements by editing variables.
• I can keep designs under version control.
• I can reuse modules across different projects.

The tradeoff is that OpenSCAD asks you to think logically. It does not behave like a sculpting tool. I have to describe what I want in a structured way. For the kind of functional and tactile work I do, that is a strength.

Your first shape

A simple OpenSCAD model can be one line:

cube([30, 30, 10]);

That line creates a rectangular box that is 30 mm wide, 30 mm deep and 10 mm high. OpenSCAD uses millimetres by default, which makes it natural for 3D printing.

Basic shapes I use all the time

• cube([x, y, z]) creates a box with width, depth and height.
• sphere(r = 10) creates a sphere with a radius of 10 mm.
• cylinder(h = 10, r = 5) creates a cylinder 10 mm tall with a 5 mm radius.

Those simple shapes can become much more useful when I move, rotate, combine and subtract them.

Parameters make designs easier to change

I avoid burying important numbers deep in the code. If a model needs to change later, I want the main dimensions near the top.

box_width = 60;
box_depth = 40;
box_height = 12;
cube([box_width, box_depth, box_height]);

Now I can change the width, depth or height in one place. That matters for custom work, because many designs need to be adjusted for a specific person, object or printer.

Combining and subtracting shapes

OpenSCAD becomes powerful when I use boolean operations. I can add shapes together with union(), remove one shape from another with difference(), or keep only the overlap with intersection().

difference() {
    cube([60, 40, 12]);
    translate([20, 20, -1]) cylinder(h = 14, r = 5);
}

That example makes a block and cuts a round hole through it. The translate command moves the cylinder before it is subtracted. For example, translate([20, 20, 0]) moves an object 20 mm on the X axis and 20 mm on the Y axis.

Making OpenSCAD easier to work with

My OpenSCAD workflow depends on clear structure. When a file becomes messy, it becomes harder to understand with a screen reader and harder to fix later.

• I use clear variable names.
• I keep main dimensions near the top of the file.
• I split repeated geometry into modules.
• I comment code when the reason for a choice is not obvious.
• I test small parts before combining them into a full model.

The OpenSCAD customizer is still mainly a visual tool, so I do not rely on it with NVDA. If a file uses customizer variables, I usually edit those values directly in the SCAD file.

A practical example

A phone cover, tactile marker or small bracket can all start the same way: measure the object, define the important dimensions, build the main shape, then cut away the spaces that need to remain open.

For exact measurements, I use whatever source makes sense for the project. Sometimes I measure a real object. Sometimes I look up the official dimensions of a phone or part. Sometimes I print a test piece and adjust from there.

If you visit my STL Library, you can find OpenSCAD-based designs that show how this kind of thinking becomes printable objects.

Why this matters for accessibility

OpenSCAD matters to me because it gives blind makers a serious way into 3D design. It also makes designs easier to document and adapt.

A tactile design often needs exact spacing, raised details, clear labels and repeatable measurements. Text-based design helps me control those things. If a Braille label needs to move 2 mm, I can change a number. If a handle needs to be wider, I can change a parameter.

Mistakes I try to avoid

• I do not let a file grow without structure.
• I do not hard-code every number if the design may need changes later.
• I do not nest modules so deeply that I cannot follow the logic.
• I do not trust a design until I have printed and tested the relevant parts.
• I do not forget to back up files.

Final thoughts

OpenSCAD can look intimidating at first because it is code. Once I understood the basic idea, it became one of the most practical tools I had. I can design with text, revise with precision and build models that make sense through touch.

If you are blind or visually impaired and want to try 3D design, I think OpenSCAD is worth your time. If you are sighted, it is still worth learning because it teaches disciplined, measurable design.

I do not see OpenSCAD as the only answer. I see it as a very good doorway into accessible 3D modelling.