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Making Your 3D Printed Parts Waterproof

3D printing is amazing, but there’s one little problem: most 3D-printed parts aren’t naturally waterproof. That means if they get wet, they can get damaged. But fear not, we’re here to show you how to make your 3D-printed creations waterproof without breaking a sweat. It’s not as complicated as it sounds, and it could save your 3D prints from turning into a soggy mess.

Protect Your 3D Prints from Water Damage with These Easy Steps

Step 1: Material Matters
The first thing you need to think about is the material you’re using for your 3D print. Not all materials are created equal when it comes to waterproofing. Some materials can’t handle water and will deform or react badly. So, choose your material wisely.

  • PLA: It’s okay with cold water but not the best for waterproofing.
  • ABS: Excellent for waterproofing, but be careful in cold conditions.
  • PETG: This is a solid choice for waterproof prints and can handle some heat.
  • Polypropylene (PP): The champion of waterproofing, naturally repelling water and resisting damage.


  • If it’s for food or drinks, use food-safe materials like PP or PETG.
  • If it needs to handle heat, go for heat-resistant materials like ABS or PETG.
  • If it’ll be out in the sun, choose UV-resistant materials like ASA.

Step 2: Slicer Settings
The way you set up your 3D printer is crucial for waterproofing. Here are some settings to keep in mind:

  • Extrusion: Increase the extrusion multiplier to reduce gaps in your print.
  • Shells & Infill: Use more shells and higher infill for added strength.
  • Nozzle Size: A wider nozzle can help make your prints more waterproof.
  • Layer Height: Smaller layers are better for keeping water out.

Step 3: Post-Processing Magic
Post-processing can work wonders for waterproofing your 3D prints. Try these methods:

  • Layer Smoothing: Blend the layers with solvents like acetone, epoxy, or wax.

Step 4: Test It Out
Don’t just assume your print is waterproof after all this effort. Test it to be sure:

  • Fill it up with water and see if it leaks.
  • Weigh it before and after soaking it in water to check for absorption.


Making your 3D prints waterproof isn’t rocket science, but it does take a bit of know-how. Start with the right material, fine-tune your printer settings, do some post-processing, and test it to make sure it’s truly waterproof. Now you can confidently 3D print parts that won’t be defeated by a little water!

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