Can You 3D Print Waterproof or Watertight Parts?

1. Yes — With the Right Technology

Achieving watertight 3D prints is possible but requires specific technologies and design considerations.

2. Best Technologies for Watertight Parts

SLA (Stereolithography) — Best option. Parts are solid resin with no layer gaps. Naturally watertight without additional treatment. Available on both standard SLA (Form 3L) and Industrial SLA for larger parts.

MJF — Parts are slightly porous by default but can be sealed with post-processing (epoxy coating or dyeing process).

3. Design Tips for Watertight Parts

• Minimum wall thickness: 0.8mm+, but 2mm+ recommended for water-holding applications

• Avoid thin features that may have micro-gaps

• Design drain holes if the part will be hollow

• Specify watertight requirement in your order notes so our team optimizes settings

4. Post-Processing Options

• Epoxy coating — Most reliable seal for any technology

• Dyeing — MJF dyeing process partially seals surface pores

5. Limitations

• FDM parts are not recommended for watertight applications due to layer gaps

• No technology guarantees pressure-vessel-grade sealing without post-processing

• UV exposure can degrade SLA parts over time, potentially compromising seal

For enclosures, housings, or any application requiring water resistance, tell us about your project and we’ll recommend the best approach.