3DPrintCalcs
UV Curing Calculator — Post-Cure Time & Settings
Calculate post-cure time based on UV source, wavelength and part thickness.
How We Calculate This
UV Curing Calculations
- Cure time = Base time x Thickness factor x Source factor
- Thickness factor = sqrt(Part thickness / 10mm)
- Rotations = Based on total cure time for even exposure
Most hobby resins are formulated for 405nm, which is simply the most common LED wavelength — it is not inherently faster than 385nm or 395nm. The wavelength only matters in that it should match the absorption of your resin's photoinitiator (check the resin TDS). Thicker parts need more time as the UV must penetrate deeper, and rotating the part ensures every surface receives even exposure for a uniform cure.
Frequently Asked Questions
Resin prints come off the printer only partially cured. Post-curing with UV light completes the polymerisation, increasing strength by 50-100%, improving heat resistance, and eliminating the tacky surface. It also makes the part food-safer.
Yes, excessive UV exposure can make resin prints brittle and cause yellowing (especially with clear resins). Standard resins typically need 3-10 minutes. If the surface becomes chalky or the part cracks easily, it is over-cured.
Yes, curing submerged in water prevents oxygen from inhibiting the surface cure. This eliminates the tacky surface finish and gives a harder, more uniform cure. Place the part in a clear container of water under the UV light.
Yes, but results are inconsistent due to weather, time of day, and season. Place the print in direct sunlight, rotating every few minutes. Allow 2-3x the time compared to a dedicated curing station. UV stations give more reliable results.
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Layer Cure Calculator
Determine optimal cure depth and exposure energy for each resin layer.
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Last updated: February 2026
All calculations are estimates. Always verify settings with test prints before committing to final prints.