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3D Printed Aquarium Cover Spacer for Better Water Flow

3D Printed Aquarium Cover Spacer for Better Water Flow, design preview, hero tilt

Design preview. Rendered from the file, not a photo.

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What it does

  • Lifts your tank cover just enough so water can cool down through evaporation, keeping fish safe from overheating.
  • Stops fish from jumping out while still letting heat escape, so your tank stays in the right temperature range.
  • Print on demand means you get exactly what your aquarium needs without waiting.

Your fish stay healthy when your tank stays cool. During hot months, even with the heater off, water gets too warm. These spacers prop your cover open just right so water can cool down naturally, keeping your fish comfortable all summer long.

You place these under your cover to create a small gap. Evaporating water cools the tank, but the spacers keep the opening small enough that fish cannot escape.

No waiting for shipping, no guessing if they will fit. You customize, you print, you install.

1.8k downloads in the maker community. That is interest in the design on the site it came from, not our sales.

What you get

  • This design prints as one piece.
  • Nothing else to print or buy for this to work.

What it is made of

Designs like this print well in PLA. Compare the materials.

Printed plastic is strong for its size, but it is not metal. We have not load tested this design, so we do not publish a weight rating. Keep it out of a hot car and away from open flame.

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Who made this design

Designed by marcoalici. We did not draw it.

Shared under GNU GPL. See the original design