Resin Calibration Guide

Find the sweet spot

Under-exposure causes layer delamination and weak parts. Over-exposure leads to loss of detail and bloated dimensions. The Resin Exposure Finder (XP2) test is the gold standard.

• Start with the manufacturer's recommended time
• Print an XP2 validation matrix at 0.5s increments
• Look for clean, sharp edges on the smallest features
• Bottom exposure should be 8-12× normal exposure

Reduce peel forces

High lift speeds create suction forces that can rip supports or cause layer shifts. Too slow wastes time. Finding the balance reduces failures dramatically.

• Start with 1mm/s lift speed and 8mm lift distance
• Gradually increase speed until you see artifacts
• Reduce by 10% from failure point for safety margin
• Use slower speeds for large cross-section prints

Resolution vs speed trade-off

Thinner layers give smoother surfaces but take longer to print. Each layer height needs its own exposure time — you can't simply scale linearly.

• 0.03mm for miniatures and high-detail work
• 0.05mm for general purpose — best balance
• 0.10mm for functional parts and rapid prototyping
• Re-calibrate exposure for each layer height you use

The hidden variable

Cold resin is more viscous and cures slower. A 5°C difference can mean the difference between a successful print and a failure. Most resins work best between 25-30°C.

• Use a space heater or enclosure in cold environments
• Warm resin to 25°C before printing
• Adjust exposure +10-15% for every 5°C below 25°C
• Never heat resin above 35°C — it degrades

Measure and compensate

Even with perfect exposure, resin shrinks during curing. Parts may be 0.5-2% smaller than designed. For functional parts with tolerances, you need to measure and compensate.

• Print a calibration cube and measure all three axes
• Record X, Y, Z shrinkage percentages
• Apply compensation in your slicer's scaling settings
• Re-test after post-curing — UV curing adds more shrinkage