Hong Kong Mahjong – Standard Set

Hong Kong Mahjong Set – Standard Edition

This is a realistic-size Hong Kong-style mahjong set designed for multi-color FDM 3D printing.

Each tile measures 42 × 30 × 20 mm, with rounded edges, a colored back layer, and engraved multi-color face details. This release is the standard non-weighted version. A weighted version may be released later for users who prefer a heavier, more realistic hand feel.

The tile face illustrations are based on public domain SVG artwork from the samoheen/mahjong-tiles project on GitHub. The 3D tile models, multi-color layout, dimensions, print settings, and MakerWorld print profiles were created for this project.

Recommended Strength Settings

The sparse infill density has a direct effect on tile weight:

• 15% infill: about 9 g per tile
• 50% infill: about 17 g per tile
• 70% infill: about 22 g per tile
• 75% infill: about 23 g per tile
• 100% infill: about 29 g per tile

For this model, I recommend using 70% infill or lower.
When the infill is higher than about 75%, the back side of the tile, which is printed against the build plate, may become slightly curved or warped.

If you prefer a heavier tile, I recommend waiting for the future weighted version instead of using 100% infill.

Recommended Quality Settings

Ironing can make the top surface smoother.

Suggested ironing settings:

• Ironing type: Topmost surface
• Ironing flow: 10%
• Only one wall on top surfaces: Topmost surface

These settings help make the front face smoother while keeping the small multi-color details reasonably clean.

Recommended Speed Settings

For better face detail, especially on flower tiles and dot tiles, I recommend lowering the speed for visible and small features:

• Outer wall: 80 mm/s
• Small perimeters: 30 mm/s
• Top surface: 60 mm/s

These slower settings noticeably improve the clarity of the tile face details.

Build Plate Notes

I tested the model with the following plates:

• Textured PEI Plate
  Gives the back side of the tile a slightly textured surface.
• Cool Plate SuperTack
  Produces a smoother back side, closer to the feel of real mahjong tiles.

Other build plates may also work, but I have only tested these two.

Post-Processing

After printing, the tile face can be lightly sanded with 1000-grit sandpaper to improve smoothness.
Use very light pressure and only a few passes, usually fewer than 5 times, to avoid damaging the printed details.

Matching Storage Tray

A matching stackable storage tray system is also available for this mahjong set:

https://makerworld.com/en/models/2853518-stackable-mahjong-tray-for-42x30x20mm-tiles

The tray is designed for these 42 × 30 × 20 mm tiles. Each tray holds 36 tiles in a 4 × 9 layout, and a full 144-tile set requires 4 trays and 1 lid.

The storage tray project includes:
- X1C split version
- H2C / large-format one-piece version
- Stackable tray design
- Matching top lid.

Notes

This release currently includes the standard Hong Kong-style mahjong tiles. A matching stackable storage tray is available as a separate model. A weighted edition may be added in a future update.