Expand and customize your reptile’s underground world with these Modular Tunnel Add-Ons, designed to connect seamlessly to our Underground Humid Hide system.

These tunnels allow you to create natural, underground pathways that lead from beneath the substrate up to the enclosure surface — perfect for bioactive setups, enrichment-focused enclosures, and reptiles that love to explore.

🧩 What This Listing Is For

This listing is for tunnel pieces only.
➡️ The underground hide itself is sold separately here: https://reptile-studio.audhdly.com/products/underground-humid-hide

Use these add-on tunnels to:

Extend existing underground paths
Add new exits to the surface
Create multi-directional or looping tunnel systems
Adapt layouts as your enclosure grows or changes

🛤️ Available Tunnel Styles

Choose from three modular tunnel types:

Straight Tube – Ideal for direct underground runs
Elbow Tube (90°) – Perfect for corner turns and compact layouts
Curved Tube – Designed to rise smoothly up to the substrate surface

All tunnels are designed to connect cleanly and securely to compatible hide entrances and to each other.

📏 Size Compatibility

Tunnel sizes are matched to the hide size you select. Please choose the same size as your existing hide to ensure a proper fit.

🔸 Small

Straight: 3in L × 2.5in diameter (76.2mm × 63.5mm)
Curved: 5.64in L × 2.5in diameter (143.3mm × 63.5mm)
Elbow: 3.67in L × 2.5in diameter (93.3mm × 63.5mm)

🔸 Medium

Straight: 4in L × 2.92in diameter (101.6mm × 74.2mm)
Curved: 6.93in L × 2.92in diameter (175.9mm × 74.2mm)
Elbow: 5.07in L × 2.92in diameter (128.7mm × 74.2mm)

🔸 Large

Straight: 5in L × 3.42in diameter (127mm × 86.9mm)
Curved: 8.5in L × 3.42in diameter (215.8mm × 86.9mm)
Elbow: 6.5in L × 3.42in diameter (165.1mm × 86.9mm)

❗ Important Notes

This listing does not include the hide
Tunnels are intended for underground use beneath the substrate
Always verify size compatibility before ordering
Custom colors may vary slightly from what’s shown due to screen differences and filament batch variations

⚠️ 3D Printing Disclaimer

This item is individually 3D printed, making each piece truly one of a kind! While we work hard to produce clean, high-quality prints, minor surface variations such as faint lines or tiny bumps are a normal part of the 3D printing process.

We do our best to minimize or prevent these flaws through careful printing and post-processing, but because every print is unique, a completely flawless surface cannot be guaranteed. Thank you for understanding and appreciating the handmade nature of 3D printed art!

Country/Region

Country/Region

Hide Add-Ons

Underground Humid Hide Tunnel Add-Ons – Replacement & Expansion Tubes