3D Printing Calculators
Resin Degassing Time Estimator
https://www.3dsizing.com/calculators/resin-degassing/
Estimate only — not firmware, a slicer profile or a shop quote. Confirm on a test print.
Resin Degassing Time Estimator
Stirring or pouring injects air. Stokes’ law gives a terminal rise speed for a small bubble in a viscous fluid. Correct viscosity from 20 °C with a simple Arrhenius-style factor, then divide vat depth by that speed.
Inputs
Results
- Viscosity at temperature
- 260.0cP
- Rise speed
- 0.0921mm/s
- Time to surface
- 3.62min
Calculation method
Viscosity is first shifted from a 20 °C centipoise value with μ = μ20 × exp(B × (1/(T+273) − 1/293)) and B = 2500. Convert cP to Pa·s by dividing by 1000. Bubble radius is half the diameter in metres. Stokes’ terminal velocity is 2 r² (1100 − 1) × 9.80665 / (9 μ). Rise in mm/s is that velocity times 1000. Degassing minutes are (depth in metres / velocity) / 60. Temperature uses the °C ↔ °F toggle; viscosity in cP does not convert.
Exact formula
μ(T) = μ20 × exp(2500 × (1/(T+273) − 1/293)). r = (bubble_µm × 1e-6) / 2. v = 2 r² (ρ − ρ_air) g / (9 μ) with ρ = 1100 kg/m³. time = depth / v. Limits: Stokes plus a generic Arrhenius 2500 K factor; resin is not a Newtonian infinite bath. Vacuum beats waiting. Microbubbles take much longer.
Don’t scrape the FEP to “pop” bubbles
You scratch the film and seed the next print’s bubbles. Rest, tap the vat, or vacuum.
Frequently asked questions
Should I warm the bottle?
Warmer resin is thinner and bubbles rise faster, until you overheat and shorten pot life. 25–30 °C is a common shop compromise.
Vacuum vs waiting.
A vacuum chamber collapses bubbles in minutes. This timer is for a rest on the bench after stirring.
Why 200 µm default?
It is a visible bubble. The 50 µm haze you cannot see would take much longer — the r² law is brutal.
Is 1100 kg/m³ right?
It is a typical photopolymer density (SG ~1.10). The volume-to-weight tool has family SG if you need mass, not rise speed.
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