3D Modeling on Demand - Rhino, Fusion 360 (Guide)

3D printing and casting all begin with a single file - the 3D model. The catch: most people have a great idea but no file. At AEJaCA we close that gap. We model from a sketch, a photo, or a plain description, in Rhino and Fusion 360. We don't just print finished files - we design them for you.

What is 3D modeling on demand?

3D modeling (also called CAD) is creating a digital, three-dimensional representation of an object that a machine can produce - print, cut, or cast. It's the first and most important step of the whole process: without a good model, even the best printer will faithfully print your mistakes.

The key difference: you don't need to arrive with a finished file. You can arrive with an idea. A sketch on a napkin, a photo of a broken part, dimensions from a caliper, or "I want a bracket that fits here" - that's enough for us to start.

When do you need a custom model?

• You have an idea, not a file - original jewelry, a figurine, a gadget, a decorative piece from scratch.
• You need a spare part that isn't sold anywhere - we rebuild the geometry from the broken original (reverse engineering) and print a new one.
• You're designing something functional - an electronics enclosure, a mount, an adapter, a gear. Here tolerances and fits matter, and a parametric model lets us dial them in.
• You have a file, but it's not printable - we repair the mesh, close the solid, optimize wall thickness. More in How to prepare an STL file.

Rhino vs Fusion 360 - what we model with and why

We use two professional tools, because each is best at something different:

Rhino excels at organic, sculptural shapes - rings, pendants, flowing forms. Fusion 360 is parametric: change one dimension and the whole model recalculates - invaluable for parts that must fit together to tenths of a millimeter. We match the tool to the task, not the other way around.

Jewelry vs technical parts - two worlds, one workshop

Jewelry modeling

Rings, signets, pendants, earrings - modeled for lost-wax casting or direct resin printing. We account for finger size, stone seats, casting-safe wall thickness, and space for engraving. You approve a 3D render before anything is made physically.

Technical and functional part modeling

Enclosures, adapters, mounts, gears, spare parts - here fits, tolerances, and material choice for the load are critical. We model parametrically, so later changes (e.g. a different hole size) are fast and cheap. We then print the model in the right material - from PLA to carbon-fiber nylons.

The process and the files you get

1. Brief - you send a sketch, photo, dimensions, or description. We clarify the goal and material.
2. CAD model - we build the geometry in Rhino or Fusion 360.
3. Render / preview - you see the model from every angle and approve. Edits are cheapest here.
4. Production file - we export the right format for your goal.
5. (Optional) production - we 3D-print, cast, or mill it in one order.

Not sure which format to pick? Just tell us what the model is for - format is our job. If you already have an STL, you can drop it into the sTuDiO calculator and get an instant print price.

How much does 3D modeling cost and how long does it take?

Modeling cost depends mostly on complexity, not on the object's size:

• Simple solids (adapter, basic bracket, stand) - least effort.
• Functional parts with tolerances (enclosure, mechanism, fit) - medium effort.
• Jewelry and organic forms (openwork, stone settings, sculptural detail) - most hand-work.

That's why we quote modeling individually - once we see the sketch or brief, we know the workload and give you a firm price. Modeling itself usually takes a few days; we often combine it with printing or casting in one order, so you don't pay twice for logistics.