Modular Card Holder System for Terraforming Mars

Designed for Terraforming Mars players who want a clean and flexible way to store and manage large card decks.

This magnetic modular card holder consists of a base section and expandable middle sections that snap together using embedded magnets. Add or remove modules depending on the size of your deck, making it suitable for both the base game and larger collections.

For reference: the cards in the photo are sleeved with Sleeve Kings SKS-7711

Included Modules

Base Module

• Height: 2.5 cm

• Required for every build

Small Extension Module

• Height: 2.5 cm

• Adds additional deck capacity

Large Extension Module

• Height: 5 cm

• Adds double the capacity of the small extension

Mix and match extension modules to create a holder sized for your deck, whether you're using the base game or a fully expanded collection.

Features

• Modular, stackable design

• Magnetic connections for secure assembly

• Expandable capacity by adding additional sections

• Easy access to cards during gameplay

• Compact footprint on the game table

• Supports sleeved and unsleeved cards (adjust according to your design)

• Clean, minimalist appearance

• Print all parts without supports.

• Recommended layer height: 0.16 mm.

• PLA works great, but PETG is also suitable.

Each module requires:

• 6 × 3 mm diameter × 1 mm thick magnets

Be sure to check magnet polarity before final assembly so all modules connect correctly.

• Print one base module.

• Print as many extension modules as needed.

• Insert magnets with consistent polarity.

• Stack modules together.

• Load your cards and enjoy a cleaner game setup.

Perfect for organizing project cards, keeping decks accessible, and reducing table clutter during long Terraforming Mars sessions.