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UltiMaker S8 Installation and user manual
6.5 Print quality issues
This section covers several potential print quality and print process problems, with some tips on how to
resolve or prevent them.
Build plate adhesion
A poor adhesion of the print to the glass build plate can lead to warping, print shifts, or the print detaching
completely. Take the following actions:
• Material settings: Ensure that the correct material temperatures (print core and build plate) and adhesion
helpers (e.g. brim) were used.
• Print settings: Check the print settings in UltiMaker Cura and try one of the default profiles instead.
• Clean the build plate: Thoroughly clean the flexible build plate with IPA. Only apply glue if specifically
recommended for this material.
• Active leveling: Ensure that the nozzle tips (and the build plate) are clean before starting the leveling
process and the print.
Extrusion
If the filament is not extruding consistently, this can cause holes in the print, a rough outer surface, or flow sensor
errors that pause the print. Extrusion problems can have different causes:
• Material quality: Dry the material if it has absorbed moisture. Always store the material properly, following the
storage condition recommendations.
• Friction in the extrusion path: Apply proper and timely maintenance to keep the extrusion path clean and
prevent excessive friction. This includes the feeders, the Bowden tubes, and the print cores.
• Print settings: The high-speed profiles are carefully tuned and tested. If extrusion issues appear when using
custom settings, first try one of the default UltiMaker Cura profiles instead.
• Configuration: Only the AA+ and CC+ print cores are optimized for high-speed printing. The same productivity
cannot be achieved with other print core types, despite the improved motion planner. Do not use PLA
in the CC+ print core.
Accuracy
You expect your printed part to be as close as possible to the 3D model. Deviations may appear as incorrect
dimensions, skewed angles, or vibrations on the surface. Try the following tips to improve the printer’s accuracy:
• Short belt tension: If the belts connected to the X and Y motors are too loose, the movements of the print head
will not be accurate. Tighten the belts by adjusting the motor position.
• Print head alignment: The shafts that go through the print head should be perpendicular to each other and the
gantry axles. If they are skewed, adjust the position of the pulleys in the gantry.
• Gantry maintenance: Ensure that all the axles in the gantry system are clean and well-lubricated. Only use the
supplied oil; never use the grease on the smooth axles in the gantry system.
• Calibrations: If the materials do not align well in dual-extrusion prints, perform the XY calibration to set the
right offset. If there is a layer shift in a dual-extrusion print, perform the lift switch calibration.
• Environment: Ensure that the printer is used in the recommended ambient operating conditions. The printer
must be placed on a flat, stable surface to prevent vibrations. Check if the rubber anti-slip feet are installed (if
the printer is used without a Material Station). Do not place the UltiMaker S8 in direct sunlight as this may cause
sagging in overhangs and other quality issues.
Tip: For additional help on print quality problems, error messages, or any other problem you might experience
with your UltiMaker S8, go to support.ultimaker.com or submit a support case.
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