TL;DR: A 3D printer can do more than stack flat layers. By designing its route directly, you can turn one continuous strand of plastic into a patterned, woven-looking wall. OGCode makes that approach accessible through a browser app—and shows how a designer can use AI-assisted coding to build a tool around a very specific professional problem.

Look at a mesh lampshade made with OGCode. Its strands curl into little arches, leaving openings between them. It looks closer to basketry than the usual stack of plastic rings. The interesting part is how the printer gets there.

A shape and a route are different things. In a conventional filament-printing workflow, you model an object, export its geometry, and open it in a slicer. The slicer divides it into horizontal layers and works out where the nozzle should travel, where to extrude plastic, and where to leave empty space.

For many parts, that division of work is useful: you specify the result and the software plans its construction. But a surface whose character comes from the way a strand is laid down presents a different design problem. A mesh of triangles describing the outside of an object does not, by itself, describe a particular continuous journey around it.

Think of drawing the outline of a woven basket. The outline tells you its shape; it does not tell you how to weave it.

This is the problem behind OGCode, a browser-based tool by designer Robert Dabi. You draw a profile, adjust the form and surface controls, preview the result, and export instructions for the printer. His original overview shows the process and finished prints:

The printer's instructions are called G-code. They are usually lines of text describing movements and machine settings. An STL file describes a surface; a G-code file describes what a particular machine should do.

For example, in millimetres and absolute-position mode, this illustrative line requests a straight move to a position:

G1 X50 Y30 Z12.4

X and Y locate the tool across the printing area; Z specifies height. Extrusion printers also use an E value to control filament feeding and F for movement feed rate. Other commands control things such as temperature and fans. A line's meaning depends on the modes already set, so this fragment is an explanation, not a complete printing program.

The useful detail is that X, Y and Z can change during the same move. A nozzle need not finish a flat loop before changing height. Software can describe a curve as many short movements, coordinating position with extrusion along the way.

That gives us three different ways to think about building a wall:

• Ordinary layers: print a contour at one height, step up, then print the next contour. The start-and-stop positions can leave a visible seam.
• Spiral vase mode: follow a continuous contour while gradually climbing. Imagine a spiral ramp winding around the object. This already exists in ordinary slicers; OGCode did not invent it.
• A modulated, non-planar path: vary the route's height around the contour as well as its overall upward progress. Imagine adding ripples to that ramp. How neighbouring passes approach and meet becomes part of the design.

In this context, non-planar means the path is not confined to one flat horizontal plane. It describes the nozzle's changing height, rather than requiring a tilting nozzle. A woven-looking print is still deposited material, with strands joining where they contact; the printer has not become a textile loom.

The distinction also explains an easily missed export detail. OGCode's FAQ separates changes to the object's geometry from textures encoded in the nozzle's route. Geometry can survive an STL export. The precise route cannot: opening that STL in another slicer asks the slicer to plan a new route. G-code preserves the planned movements.

For a lampshade, this is a design decision with a visible consequence. Openings, strand spacing and surface relief change the pattern of light and shadow. The process becomes something the designer can work with, rather than just a manufacturing step after the shape is finished.

Direct toolpath design is a broader idea. FullControl, an established open-source project, lets people define and preview printer movements and settings directly. Its public design library includes a non-planar spacer, continuous-path lattices, a rippled surface, and tests for overhangs and retraction settings. Those examples show uses beyond decorative vessels: investigating how material behaves, making a particular structure, or designing a repeatable test.
fullcontrol.xyz/

G-code also belongs to the wider world of computer-controlled manufacturing. A CNC milling machine follows a programmed route while a cutter removes material. An extrusion printer follows a route while adding it. The equipment and command dialects differ, but both make the movement of a tool part of how an object is produced.

Where AI enters this story is the making of the software. On his site, Dabi says:

I’m a designer, not a developer.

He describes OGCode as a vibe-coding experiment that grew into weeks of work. His portfolio already spans physical products and 3D printing. The useful pattern here is a practitioner bringing an understanding of forms, materials and frustrating workflows, then using coding assistance to turn that knowledge into an interface other people can use.

There are two kinds of expertise in that process: knowing what the tool should let a designer do, and implementing the tool. AI-assisted coding can make the second more accessible. Judging the output still involves the first—and, for a physical object, actual printing. This is an account of one maker's project, not a measured claim about how much AI improves every designer's productivity.

OGCode's focus is single-wall spiral work. It is not a general replacement for multi-wall, infilled parts. Dabi also calls it experimental and says he cannot physically test every supplied printer profile. A preview can show the intended route without proving that a particular nozzle, material and machine will execute it well.

For someone trying the technique, a useful first experiment is a small sample of the intended wall pattern, using a matching printer profile and checking the toolpath preview. It tests the feature you care about before committing to a full-height lampshade.

OGCode currently starts at €20, paid once, with a pay-what-you-want option. The product, examples and current terms are here:
ogcode.dabi.me/

For the underlying mechanics, start with the Prusa guide to spiral vase mode, Marlin's movement-command reference, FullControl's documentation or LinuxCNC's G-code overview.