Prusaslicer Support Settings: What You Need to Know

Among the many open-source 3D slicers available, PrusaSlicer stands out for the extensive and customizable support options it offers. These parameters aid in the process of transforming 3D model files into G-code, a language that 3D printers can understand and use to build the model. When printing complicated models with overhangs and detailed features, it is essential to use effective support settings. In order to assist you fine-tune your prints, this guide will explore the many support options in PrusaSlicer.

PrusaSlicer Support Settings: The Basics

1. Placement

The key to successful 3D printing is precisely positioning the support structures. The purpose of supports is to keep the model from crumbling during printing by supporting any overhangs. You have a lot of control over the placement of supports in PrusaSlicer:

Enable/Disable Supports

To enable or disable supports, go to the "Print Settings" tab, then click "Support material." In the "Generate support material" box, you may either check it or leave it unchecked. When turned on, this feature will activate the model's support structures in regions where the overhangs are at least as high as the default "Overhang threshold." You can define this threshold in degrees and alter it as needed. A lower threshold produces more supports, whereas a higher one produces less.

Options for Support

The "Plater" page provides access to a number of support placement settings, such as "Everywhere," "None," "Support on build plate only," and "For support enforcers only." While "Support on build plate only" limits supports to those that touch the build plate, the "Everywhere" option generates supports for all overhangs that exceed the threshold.

2. Paint-on Supports

PrusaSlicer's paint-on supports are a multipurpose tool for manually delineating model support zones. This function shines for complicated prints with unique requirements.

i) Manual Painting

To activate paint-on supports, press "L" to enter paint-on mode or click the brush symbol in the left panel. As a result, some areas of the plate will become invisible, and the model will become grey. To generate supports in specific places, use the left mouse button, and to exclude other areas, use the right mouse button.

Hold down Shift and left-click on the painted supports you wish to delete to remove them. This feature allows for exact control over the application of supports.

ii) Automatic Painting

Intricate models can benefit from the "Automatic Painting" mode's emphasis on trouble spots. To get a feel for the supported areas, play around with the overhang threshold slider. Once you've marked certain areas, you can paint supports over them by hand.

iii) Highlight Overhang by Angle

This tool allows you to see, according to the overhang angle, where portions of your model will require support. Adding all required supports in this way is a great help.

3. Snug Style

Introduced in PrusaSlicer 2.4, the "Snug" support style provides an alternative to the more conventional "Grid" type.

Advantages of Snug Style

For intricately shaped or rounded surfaces, the "Snug" design is the way to go because it molds to the overhang. Support removal is less likely to cause harm to the print surface when using this style. When compared to the grid form, snug supports require less material, which can be great for reducing waste and preserving filament.

4. X, Y, Z Support Gap

For support to work, there must be some space between the printed product and the support structures. There are other options in PrusaSlicer for adjusting this gap:

i) Contact Z Distance

Adjust the vertical gap to determine how much space there should be between the object and the support structure. With the right amount of space between them, supports won't get in the way of the print and are easy to remove. Supports may be less effective if the space is too big and more difficult to disconnect if it's too narrow.

ii) XY Separation

Adjust the X and Y distance between the object's edges and the supports with the Horizontal Gap setting. It is important for models that need support for their horizontal overhangs.

iii) Interface Layers

"Top interface layers" and "Bottom interface layers" are two options that, when used, provide additional layers to the supports at the top and bottom, respectively. Thanks to these layers, separating the supports from the main print is a breeze.

5. Organic Supports

Organic supports offer a less invasive and more aesthetically pleasing replacement for conventional support systems.

Branch Diameter and Maximum Branch Angle

Controlling the "Branch Diameter" allows you to alter the support thickness. When supporting heavier elements, it is essential to use thicker branches because they offer more stability. This parameter regulates the maximum allowable branch angle. When working with complex designs, a lower angle is better for creating vertical supports, while a wider angle allows for more branching.

Miniature and intricate prints that require little to no contact with the print surface are ideal for organic supports. Having said that, their hollow construction can diminish support strength; thus, they might not work as well for big, heavy models.

6. Pattern

The placement of support structures is determined by the pattern setting, which impacts both printability and strength.

• Rectilinear: It gives a basic grid-like layout that is easy to print and provides sufficient support for a wide variety of forms.

• Rectilinear Grid: This grid is quite similar to the Rectilinear grid; however, it has extra grid lines to provide even more support.

• Honeycomb: It provides a more detailed support structure that might provide strength, but its sophisticated design might make the print time longer. 

7. Pattern

Printing speeds of supports can affect print times and quality. Under "Print Settings > Speed," you'll find the speed settings that regulate the extrusion rate of the support material. You can alter the default speed from 40 mm/s to whatever you require. While faster printing rates can cut down on print times, they also increase the likelihood of support failure or weakening.

Best 3D Printing Software

There are many 3D printing software available that can prepare designs for 3D printing, and a good example is SelfCAD. It is an easy-to-use 3D design software that allows you not only to create 3D models but also to edit meshes and slice designs. It comes with interesting 3D modeling tools like freehand drawing and sketching that you can use to create designs from scratch. 

There are also selection modes as well as various modification tools to help you modify your designs based on your requirements. It also has an image-to-3D feature that makes it easier to turn photos to 3D models. You can also import STL files and modify them based on your needs. 

The software also comes with a built-in online slicer that one can use to prepare designs for 3D printing. The video below shows how to slice STL files and generate the G-code to send to the 3D printer:

Optimizing Support Settings in PrusaSlicer

You may get far better 3D printing results by adjusting the support settings in PrusaSlicer. Make sure your supports work and are easy to remove by changing their placement, employing paint-on supports, choosing the right style and pattern, managing gaps, and optimizing printing speed. To get the greatest print quality with the least amount of post-processing, play around with these parameters.

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