Gravity Plant Watering System (Universal Bottle Thread)

Going on vacation or just tired of manually watering your large plants? This modular, gravity-fed watering system turns almost any standard empty soda or water bottle (like Coca-Cola, Pepsi, etc.) into a slow-drip reservoir for your plants.

What's included in the project:

• The "Arc" (Multi-tube distributor): A large 235mm wide curved pipe with multiple drip legs. Perfect for large, wide pots to evenly distribute water around the entire root system, rather than flooding just one spot.

• The "Spike" (Single-tube): A simple, straight watering spike for standard and smaller pots.

• The Universal Cap: Custom-modeled to perfectly fit the standard 28mm PET bottle thread (PCO 1881). It screws on tightly to prevent leaks.

• STEP files included: Feel free to remix, adjust the length, or change the angle to fit your specific pots perfectly!

💡 PRO TIP FOR USAGE: For the water to flow freely, gravity needs a little help. After screwing the bottle onto the printed part and flipping it into the dirt, use a needle or a hot pin to poke a tiny hole in the bottom (now the top) of the bottle. This lets air in and prevents a vacuum lock!

Print Instructions

• Material: PETG is highly recommended. It handles constant moisture and soil contact much better than PLA, and its slight flexibility makes the threads seal better around the bottle.

• Nozzle: 0.4 mm.

• Layer Height: 0.2 mm (Don't print too thick, or the threads won't be smooth).

• Walls (Perimeters): 3 or 4 walls. This is crucial to make the parts watertight and strong enough to support a heavy, full bottle of water.

• Infill: 20-25% Gyroid.

• Orientation & Supports: * Look at the provided Orca Slicer screenshot in the gallery.

  • Print the tubes with the threads pointing UP.

  • Supports are REQUIRED, but only under the horizontal curved body and the downward-pointing legs.

  • Use Tree (Organic) supports generated only from the build plate. Keep the threaded section completely support-free for a clean screw fit.

  • The cap should be printed flat on its closed end (no supports needed for the cap).