A reinforced feeder - One of the immediate benefits of the Ultimaker S3 is it's reinforced, abrasion-resistant feeder. This enables printing with high-strength materials such as glass or carbon fiber composites when paired with CC Red Print Core.

Dual filament flow sensors - The new Ultimaker S3 offers flow sensors on both extruders which will pause your print to let you add a new spool when you run out.

Advanced active leveling - The improved and precise active leveling functionality probes more points on the build plate to build a detailed height map of your printing surface. This ensures the perfect first layer for optimal bed adhesion.

High-accuracy stepper drivers - The same steppers which are used on the Ultimaker S5 have also been used on the new S3. These are quieter than previous generations to offer improved reliability and control.

A more rigid frame - This improved frame design helps to reduce vibrations which can cause ringing on your prints. 

Single glass door  - The integrated single glass door with magnetic latch offers more control of the build environment and also reduces warping and layer delamination on your prints.

Optimized internal design - Now you can utilize the entire build area while printing with dual extrusion offering an impressive build-volume-to-size ratio.