Roman Arch Bridge Building Blocks Arch Puzzle Keystone Function Montessori

I have created an educational 3D-printable model to help children explore the function of semicircular arches, inspired by the hands-on learning approach of Montessori. Based on the Roman aqueducts, this model is my entry in this 3D design competition focused on educational tools. This toy captivates children’s interest, boosts brain development, and sharpens hand-eye coordination skills. 

The assembly process allows children to understand how each block, especially the keystone, contributes to stability. These building blocks demand focus and patience, encouraging kids to concentrate fully to achieve success. Moreover, playing this game helps develop balance and construction abilities. This model can be made as large and tall as desired, but I recommend the basic model which is composed by 32 blocks or the Extended version with 45 blocks. 

You can use the leftover filament from previous prints, resulting also in a recycling proyect. The keystone blocks are sliced with funzy skin setting which gives more grip.

Two Versions: 

Basic: 32 blocks (1KG Filament)

Extended: +12 blocks (total amount: 45 blocks) (1,6kg Filament)

Materials List:

• 3D Printer: Capable of printing with PLA or PETG filament.
• Filament: PLA or PETG with 15% infill. Aproximately 1kg for the Basic Version and 1,5kg for the Extended Version
• Filling Material: Rice or sand (for weighting the blocks).
• Glue: Cyanoacrylate glue for securing the tops of the blocks.
• Assembly Mold: A guide mold for accurate assembly of the arch.
• Assembly Plan: A printed or digital plan with coordinates for each block.

Assembly Guide:

1. Print All Parts: Use PLA or PETG filament with a 15%-25% infill for each block
2. Fill Each Piece with Rice or Sand: After printing, fill each piece with rice or sand to increase weight and stability.
3. Glue the Tops: Secure the tops of each piece with cyanoacrylate glue to prevent spilling and improve durability.
4. Follow the Assembly Plan: Use the provided assembly basic plan with coordinates for each block to ensure accurate placement during construction.
5. Assemble the Base Blocks: Arrange the foundation blocks in a semicircle on a stable surface.
6. Add Layers: Stack each layer carefully, aligning the blocks for balanced support.
7. Place the Keystone: Lock the structure by adding the keystone at the top center.
8. Use the Mold for Assembly: Utilize the provided mold to guide the assembly of the arch, and once fully assembled, carefully remove the mold.

This interactive experience teaches children about balance and structural engineering, highlighting the keystone’s essential role in Roman architecture.

BASIC ( 32 blocks)

piece number / quantity
nº1 x2
nº2 x2
nº3 x2
nº4 x1
nº5 x9
nº6 x1
nº7 x2
nº8 x1
nº9 x1
nº10 x2
nº11 x1
nº12 x1
nº13 x2
nº14 x2
nº15 x1
nº16 x1
nº17 x1

EXTENDED (45 blocks)

+ nº1 x9
+ nº2 x4