Watering Tank Spike (Tested)

Model Overview

This is a functional, one-part automatic plant watering spike designed for easy printing and instant use. It allows users to upcycle standard plastic beverage bottles into a slow-release root irrigation system. Because it is printed as a single solid piece, there is zero risk of leaks or weak joints.

Key Design Features

• Integrated Universal Threads: The top collar features pre-modeled internal threads designed to fit standard plastic bottle caps (e.g., PCO 1810 / 28mm soda and water bottles).

• Reinforced Spike: A long, tapered conical stake that easily pierces into the soil, providing enough structural stability to support bottles up to 1.5 liters.

• Optimized Drip Holes: Features a vertical row of five precisely modeled 2mm holes. This size provides a steady, reliable water flow and is large enough to resist clogging from fine soil particles.

Recommended Print Settings

• Orientation: Print upside down (wide threaded collar flat on the build plate). This provides excellent bed adhesion and completely eliminates the need for supports.

• Material: PETG or ASA is highly recommended. (They are water, bacteria, and UV-resistant. Standard PLA will degrade quickly in wet soil).

• Perimeters / Walls: Set to 3 or 4 perimeters. This ensures the hollow spike walls are 100% watertight, forcing water to exit only through the designated 2mm holes.

• Infill: 25% to 35% (Gyroid or Grid pattern) to give the stake enough mechanical strength to withstand twisting into hard dirt.

• Supports: None required.

How to Use Guide

1. Prepare the Bottle: Fill a clean plastic beverage bottle with water.

2. Attach the Spike: Screw the 3D-printed watering spike firmly onto the bottle opening.

3. Insert Into Soil: Push the spike deep into the flower pot or garden soil next to your plant.

4. Create an Air Vent: Poke a tiny pinhole in the absolute bottom (now the top) of the plastic bottle. Crucial step: Without this vent hole, a vacuum will form and water will stop flowing!