How We Designed and Engineered the Standing Wave Seder Plate

When designing modern Judaica, symbolism and structural integrity must coexist. Our Standing Wave Seder Plate — one of the most technically complex pieces in the Atid Judaica collection — began with a single image: the walls of water parting at the Red Sea.

In the Exodus narrative, the sea splits into two towering walls as the Israelites pass through. That image — flowing forms rising and falling like frozen waves — became the geometric foundation for this 3D printed Seder plate. The six peaks and valleys evoke those parted waters, forming a ring that feels like motion suspended in time.

Once the geometry took shape, it began to resemble what physicists call a standing wave: a form that looks like motion held in equilibrium. The name was fitting — and stuck.

Turning that concept into a manufacturable, functional Seder plate required substantial engineering. Here's how we did it.

Starting with a Toroidal Base Geometry

The plate's structure begins with a toroidal ring — a donut-shaped form. This geometry offers several advantages for a Passover Seder plate:

• It distributes the six symbolic foods evenly around a circular path
• It creates a stable, rigid structure
• It frames the center of the plate while keeping focus on the symbolic elements

A perfect torus, however, felt static. To evoke the motion of parted water, the ring needed to rise and fall around its circumference.

Creating the 3D Wave Form in Fusion 360

Instead of keeping the torus centerline flat, we converted it into a 3D sinusoidal loop. The process looked roughly like this:

1. Start with a circular centerline
2. Place six evenly spaced points around the circle — one for each traditional Seder item
3. Offset those points vertically in alternating directions
4. Connect the points with a smooth 3D spline

This produces a closed curve that oscillates up and down as it travels around the circle. Sweeping a circular profile along that path creates the flowing ring structure. Each bowl location sits naturally within a rising or falling section of the wave — both functional and symbolic.

Parametric Control for Proportional Flexibility

The model was built parametrically so core proportions can be adjusted without rebuilding the geometry. Key parameters include:

• Wave amplitude — how tall the peaks and valleys are
• Tube radius — the thickness of the ring
• Centerline radius — the overall diameter of the plate

Because the design is parameter-driven, we can tune proportions to balance aesthetics, structural strength, and manufacturability — making it practical to iterate without starting from scratch.

Sculpting Organic Surfaces with T-Splines

The mathematical wave provided a solid foundation, but the initial result felt too mechanical. To soften the transitions, we converted the model into a T-Spline sculpt body and shaped it by hand — adding subtle adjustments that give the geometry a more fluid, natural feel.

Edge loops were added to control how the surface bends around each bowl position. Soft selection was used to blend the depressions smoothly into the surrounding surface. Once sculpted, the body was converted back to a solid for manufacturing operations.

Engineering Precise Bowl Seating

A Seder plate needs six bowls that fit reliably, every time. Rather than approximating their shape, we modeled the bowl geometry as a separate component and used it directly to cut the seating depressions through Boolean operations.

The workflow:

5. Position bowl components around the ring
6. Subtract them from the plate using Boolean operations
7. Retain the bowl bodies as reference geometry

A small clearance tolerance was incorporated so bowls can be easily inserted and removed — functional for the Seder table, but snug enough to stay put.

Choosing the Right Filament: The Silk PLA Breakthrough

Material selection turned out to be just as important as geometry. Our initial plan was to print in transparent light-blue PETG to mimic the look of glass water — reinforcing the "walls of water" imagery. In practice, the gyroid infill became visible through the translucent plastic, creating visual clutter that distracted from the flowing form.

Switching to a matte blue filament solved the clutter, but the plate looked flat and lifeless.

The breakthrough came when Aryeh suggested using the sapphire-and-white silk PLA we use for our Meat/Milk plaques. This filament has a subtle iridescent sheen. As light moves across the curved surface, it creates shifting highlights that resemble moving water — reinforcing the concept far more effectively than the transparent plastic ever did.

Solving Layer Stair-Stepping with Variable Layer Height

On the steeper curves of the wave geometry, standard layer height produced visible stair-stepping artifacts. Because the design relies on smooth, flowing surfaces, these were more noticeable than they would be on a flatter object.

Two solutions helped:

• Slightly flattening the steepest curves in the model reduced extreme slopes, improving print quality without changing the visual character of the design
• Variable layer height — finer layers on steep surfaces, thicker on gentler areas — dramatically improved surface smoothness

The variable layers also produced an unexpected aesthetic benefit: because the silk PLA contains two colors twisted together, the variation creates subtle, irregular striations of color along the Z-axis. These appear almost like currents or ripples within the material, enhancing the water-like visual effect.

Removable Nameplates: Solving the Ironing Problem

The flat landing surfaces where bowls rest were originally printed as part of the main body and finished with ironing — a slicer technique that passes the nozzle over the top surface to produce a smooth matte finish. When it worked, it looked excellent. The problem was reliability.

On a 12-hour print, even a minor ironing defect could ruin the entire surface — too risky for production. The solution was to separate these surfaces into removable nameplates.

Each nameplate was created by intersecting the torus body with a cylinder to isolate the flat region. The resulting circular inserts were chamfered around the edges, creating a clean, intentional boundary between the main plate and the removable surface.

Triangular Registration Keys: Eliminating Supports

Once the nameplates were separated, they needed a reliable alignment system. The first attempt used a hexagonal registration key — it worked mechanically, but required support material that was difficult to remove cleanly.

The solution was a small triangular notch designed specifically for bridging. Because the triangular geometry allows the printer to span the gap cleanly, inserts can be printed without supports while still maintaining consistent alignment. This small change dramatically improved print consistency and reduced post-processing time.

Hybrid Modeling: Navigating Organic Shapes and Precision Fits

Organic modeling introduces technical quirks. When the sculpted T-Spline surface was converted back to a solid model, some regions temporarily became surface bodies rather than part of the main solid — a common occurrence when curvature becomes complex enough that the modeling kernel cannot immediately guarantee a watertight volume.

To resolve this, the surfaces were stitched back together to recreate a single continuous solid body before continuing with Boolean operations. This hybrid workflow — moving between sculpting, surfaces, and parametric solids — is standard practice when designing objects that blend organic forms with precision fits.

Form, Meaning, and Motion

The Standing Wave Seder Plate is ultimately about translating narrative imagery into physical form. The rising and falling walls echo the parted waters of the Exodus story, while the continuous circular motion reflects the cyclical rhythm of the Seder itself.

What appears to be a simple flowing shape is the result of parametric CAD modeling, T-Spline sculpting, Boolean engineering, print optimization, and careful material selection — all working together to produce a contemporary Judaica piece that honors its tradition while embracing modern fabrication tools.

At Atid Judaica, we continue to experiment with new forms that reinterpret traditional ritual objects through the lens of digital craftsmanship. If you're interested in the Standing Wave Seder Plate or want to explore the full collection of modern Passover accessories, visit our shop.