Overview
Give your cat or dog the freedom they deserve without permanently modifying your home. This modular, expandable window cat door is designed to fit a wide range of window sizes by using a simple interlocking filler system. Just print the main door section, add as many extension panels as needed, and create a custom-fit solution for nearly any window opening.
Whether you're providing access to a screened patio, catio, enclosed pool area, or simply allowing your feline friends to move between spaces, this design keeps installation easy and completely reversible.
V2 - Update included vertical option and snapfit door for better movement
✨ Features
- 🐱 Comfortable Flap
- Smooth swinging door allows easy entry and exit.
- Sized for everyday use by most adult cats.
- 🧩 Fully Modular Design
- Print only what you need.
- Interlocking filler sections expand the system to match your specific window width.
- 🪟 Custom Window Fit
- Works with a variety of horizontal window openings.
- Great for renters or homeowners who don't want permanent alterations.
- 🔒 Tool-Free Installation
- Slides into place using the window itself to secure the assembly.
- No screws, drilling, or adhesives required.
- 🖨️ Easy to Reprint
- Damaged section? Simply reprint that piece instead of replacing the entire unit.
- ☀️ Perfect for Catios & Pool Enclosures
- Provides convenient access while maintaining separation between indoor and outdoor spaces.
Recommended Print Settings
- Layer Height: 0.20 mm
- Wall Loops: 4
- Top/Bottom Layers: 5
- Infill: 15–20% Gyroid
- Supports: Not Required (depending on flap orientation)
- Brim: Recommended for larger extension pieces
- Nozzle: 0.4 mm
- Material: PETG recommended for durability and heat resistance
Material Recommendations
PLA
✅ Easy to print
⚠️ Best for indoor-only installations
PETG (Recommended)
✅ Heat resistant
✅ Durable
✅ Better for Florida windows and sun exposure
ASA
✅ UV resistant
✅ Excellent for outdoor applications
⚠️ Requires an enclosed printer
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