XL Adjustable Mold Box — Silicone, Resin, Plaster & More

About This Model

The OreKo XL Adjustable Mold Box is a functional tool designed for makers who work with silicone, resin, plaster, and other casting materials. Rather than buying expensive commercial mold frames or taping together makeshift enclosures that leak at the corners, you print a set of walls and clip them together with standard clips you probably already have.

The design is engineered around two key details that make it work better than most DIY alternatives. First, the corners are designed at exactly 90 degrees for a near-seamless joint that prevents mold material from leaking out. Second, the walls are thick enough at 5mm to stand upright and hold their shape under the weight of poured silicone without brims or special orientation.

Two versions are included: the 240mm version for larger beds (256x256mm or bigger) and the 200mm version for standard beds like the Ender 3 at 220x220mm. Both print at the same wall height of 50mm.

How to Use the Mold Box

The mold box is a frame system. You print four walls, arrange them into a rectangle around your master object (the item you are making a mold from), and hold the corners together with clips. Pour your silicone, resin, or plaster into the enclosure and let it cure.

Step by step:

1. Print four walls — two pairs for a rectangular mold frame
2. Place your master object on a flat surface
3. Arrange the four walls around the object into a rectangle
4. Clip the corners with binder clips, spring clips, or dollar store clips
5. Check for gaps at the corners and base — the 90° design minimizes these
6. Pour your silicone, resin, or plaster slowly to avoid air bubbles
7. Allow to fully cure before removing the walls
8. Unclip and separate the walls for easy mold release

The adjustable nature of the system means you can configure the four walls into different rectangle sizes depending on how you arrange them. Combine 240mm and 200mm walls in the same frame for non-square mold dimensions.

Print Settings

🎯 Nozzle

0.4mm
Standard. Both versions.

📏 Layer Height

0.08mm to 0.20mm
0.08mm for optimal surface quality. 0.20mm for standard fast prints. For functional mold walls, 0.20mm is perfectly sufficient.

🛠 Infill

15% to 100%
100% for optimal. 25% for strong. 15% for standard. For mold walls under casting pressure, 25% or higher is recommended.

⚡ Supports

None required
No supports on either version. Print vertical or horizontal for strongest result.

Settings by Profile

Tips for Better Molds

Seal the base before pouring. Place the frame on a smooth flat surface — a piece of glass, an acrylic sheet, or a silicone mat. The 90° corners minimize leakage but a small bead of clay or mold putty along the base edge inside the frame gives you a leak-free seal.

Use a release agent on the walls. A light coat of petroleum jelly, mold release spray, or Vaseline on the inner faces of the walls makes the cured silicone or resin release cleanly without sticking to the PLA surface.

For deep molds, stack walls. At 50mm height, a single layer of walls works for most masters. For objects taller than 40mm, print a second set of walls and stack them to double the usable mold depth.

Don’t overtighten the clips. The walls need to hold square under the weight of the pour, not be crushed together. Standard binder clip tension is exactly right. Dollar store spring clips also work and are easier to open with one hand during pouring.

What You Can Cast with This System

The OreKo mold box frame works as a containment system for a wide range of casting materials:

Silicone rubber: The primary use case. Pour two-part silicone around a master object to create a flexible mold for resin casting, candle making, soap making, or food-safe applications (with food-safe silicone).

Resin: Pour UV or two-part epoxy resin directly into the frame with a master embedded to create solid resin casts, coasters, paperweights, or decorative panels.

Plaster / Hydrocal: Excellent for making rigid molds or casting architectural detail pieces. Plaster releases cleanly from PLA walls.

Concrete: For small decorative concrete pieces, plant pots, and garden ornaments. The walls handle the weight of concrete mix without flexing if printed at the strong settings.

Soap and candle wax: Low-temperature casting materials that work well with PLA walls at standard settings.