Ultimaker Cura 5's brand new Cura engine contains all the familiar print settings of the previous Cura versions you have been using. On top of that, a few new settings have been added to control the new 'variable line widths', which are summarised below. The settings that these replace, can be found here.
Note: Ultimaker has tested and optimised print profile changes throughout Cura to get the most of the new slice engine. An overview of print profile changes can be found here.
Tip: The settings below are part of the 'wall setting' category available in Cura and can also be found on the wall settings page.
Wall transition length
In some cases, the model walls cannot be printed with the regular line width, when the model is too thin. To fix this, the wall line width needs to transition between the number of walls required to fill the model. The wall transition length allows to specify the length of each part, before the lines are potentially split again. The impact of this change is mostly visible in the thin parts of this 3D model.
Note: Ensure the 'wall transitioning threshold angle' is set correctly, or this setting will not directly show on the model.
Example: The left model has a value of '2mm', the center model is the default of '0.4mm' and the right model has a wall transition length of '0.1mm'.
Wall distribution count
When a printed line width needs to be adjusted to fill the gaps between walls, this only happens on the inner walls of a print, to keep the outside wall as smooth as possible. Increase this setting when printing multiple inner walls to divide the wall line widths equally, as in the thin parts of the 3D model below.
Example: The model on the left is printed with a 'wall line distribution' of 1, keeping the line width of the outermost inner wall as close as possible to 0.4. The model on the right has a 'wall line distribution' of 3, printing all inner walls with adjusted line widths.
Wall Transitioning threshold angle
This setting controls transitions of printed lines in sharp angles in models. All sharp edges of 3D models that do not meet the threshold, will be printed without line transitions. Increasing this setting will negatively impact visual quality, while allowing sharp edges to be printed.
Example: This 3D model has a sharp edge of 20°. The model on the left has the 'wall transitioning threshold angle' set to 25°, allowing line transitions. The model on the right has a setting of 10°, the bottom part has no line transitions.
Wall transitioning filter margin
When printing variable line widths, the lines need to transition from one width to the other. The transition between these widths can be done over a short distance or over a long distance. Increase this margin to reduce the number of transitions, travels and print start and stops. However, long transitions and line width variations might lead to under- or overextrusion problems.
The model on the left has the default 'wall transitioning filter margin' of 0.1mm. The model on the right has a value of 0.2mm, reducing the number of transitions but increasing the transition length.
This setting determines which walls are printed first, the outer or the inner walls. When enabled, the outer walls are printed first and X-Y dimensions are more exact. Printing the outer walls first improves dimensional accuracy.
Minimum wall line width
Depending on the nozzle used to print your 3D model, the line width can be adjusted to a minimum at which the nozzle still prints in acceptable quality. Adjust this setting to push the limits of the line widths printed to a minimum and automatically reduce the maximum line widths within the model.
Note: This setting adjusts the minimum wall line widths through the entire model. To adjust only the thin outer walls, please adjust the 'Minimum thin wall line width' feature.
Example: This model is printed with a 0.4mm nozzle. The left one has a default 'minimum wall line width' of 0.34, the model on the right a value of 0.2.
Odd and even minimum wall line widths
In thin places of the 3D model, walls are the only printed part. When the model is extremely sharp, a single wall might be necessary to fill the entire space. The minimum line width of 'odd' and 'even' walls can be set separately.
Example: The model on the left has both 'equal' and 'odd' minimum line widths set to 0.34mm, evenly dividing the variation along all walls. The model on the right has an 'equal' minimum line width of 0.34mm and 'odd' line width of '0.2mm'. The center part is filled with an extremely thin wall (blue), but the outer wall is smoother.
Minimum feature size
3D Models with extremely thin parts may be filtered out by Ultimaker Cura still, as they're impossible to print without over-extruding the part. Adjust this setting to reduce the amount of material printed in these parts, or to force Cura to print them, even when the part will come out too wide.
Example: At the top of this 3D model, the thin 'hook' cannot be printed, as it's too thin. The model on the left has a 'minimum feature size' of 0.3mm, the model on the right the default value of 0.1mm.
Minimum thin wall line width
This setting allows the printer to reduce the wall line width further, on thin parts of the 3D model. This means wall line widths within the model will not be adjusted. 3D models can be printed closer to their tolerances but the thin line width could cause reduced print quality in the affected parts.
Example: The model on the left has a 'minimum thin wall line width' of 0.34, the model on the left of 0.15. This allows the sharp top part to be printed without over-extruding it.
Tip: The setting below is part of the 'material setting' category available in Cura and can also be found on the material settings page.
Scaling factor shrinkage compensation
This setting take into account the dimensions your 3D model will have after printing and cooling of the 3D printed material. This allows dimensions to come even closer to the expected final result. As materials have different shrinkage factors, the values here depend on the material loaded in your 3D printer.
Tip: The setting below is part of the 'speed setting' category available in Cura and can also be found on the speed settings page.
Flow equalization ratio
Printed lines with variable line widths are printed in different speeds to ensure the flow within the nozzle changes as little as possible. The flow equalization ratio determines the correction to this flow and can be adjusted to compensate the flow further when needed.
Example: This 3D model has been sliced with the default value of 110% 'flow equalization ratio'. As seen here, the line widths vary while the flow remains the same throughout the printed part.