Kapla Block Generator (With Wood Grain)

🪵 The ultimate customizable Kapla-style building block generator!

Stop paying for expensive wooden building sets. This fully parametric OpenSCAD generator allows you to create mathematically perfect building blocks with the exact classic 1:3:15 ratio. Best of all, it dynamically generates a realistic, randomized wood grain texture directly into the plastic surface, giving your 3D printed blocks an incredible tactile feel and premium look!

⚙ Customizer features:

Auto-Fill Build Plate: Select your specific printer size (like 256x256 for Bambu Lab, or 180x180 for the A1 Mini). The algorithm automatically calculates the maximum number of blocks that can fit on your bed, rotates them optimally, and spaces them out perfectly!

Randomized Wood Grain: Enable the Enable_Texture setting. A powerful math algorithm generates unique, randomized wood grain lines on every single block. You can fully adjust the density, depth, and width of the grain!

End-Grain Growth Rings: The algorithm even simulates natural wood growth rings on the short ends of the blocks using calculated mathematical extrusions.

Perfect Proportions: Modify the exact Thickness in millimeters. The customizer will automatically scale the width and length to maintain the critical 1:3:15 building ratio.

Safety Chamfers: A built-in parametric chamfer rounds off all 12 sharp edges of every block, ensuring they are perfectly safe for young children.

🧠 Behind the design (For makers & moderators)

Generating a randomized texture across multiple objects without crashing the slicer requires highly optimized procedural generation.

This model does not use massive, high-poly imported displacement maps. Instead, it uses a custom pseudorandom function (rand_val) based on sine math. This function seeds a looping array that generates microscopic, slightly angled 3D cutouts (cube) along the surface of the block. Because the b_seed is shifted based on the row and column coordinate of the block on the build plate, every single block in the batch gets a mathematically unique wood grain pattern. Finally, the end-grain is simulated by projecting concentric rings from an imaginary center point (center_z = -120) far below the block, mimicking exactly how lumber is milled from a tree trunk!

🖨 Print settings:

Material: PLA. (For the absolute best result, use Wood-Fill PLA or Matte Desert Tan PLA. The matte finish hides layer lines and makes the wood grain texture pop beautifully).

Layer height: 0.20mm or 0.28mm works perfectly.

Supports: STRICTLY NONE.

Infill: 10% to 15% (Gyroid).

Texture settings: If you print the blocks flat on their back, turn Texture_Bottom OFF. 3D printers cannot print tiny texture lines accurately against the flat PEI build plate! Leave it enabled for the top, sides, and ends.

❤ Share your prints!

I love seeing your massive towers and creative architecture. Please upload a photo of your make!

Happy printing!