PrusaSlicer 2.3 is out! Paint-on supports, Ironing and more!

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The final version of PrusaSlicer 2.3 with Paint-on supports, Monotonic infill and Ironing is out! Big thanks to all of you who tested alpha, beta and release candidate versions and shared feedback with us. PrusaSlicer releases bring major changes and improvements and version 2.3 is no exception. Let’s take a look!

What’s new in PrusaSlicer 2.3

Before we jump into a detailed description of new features, here’s a quick overview of the biggest additions:

On Windows, you can choose from two installers:

A new auto-updating lightweight PrusaSlicer installer – contains just PrusaSlicer, but you can choose the download sample objects during installation. This installer is in the beta-version, please, report any bugs to info@prusa3d.com.

PrusaSlicer & Drivers installer – also includes sample objects and printer drivers. This is also the main installer for Mac & Linux distributions.

As the number of features and tools in PrusaSlicer keeps growing steadily, we also keep continuously expanding the PrusaSlicer documentation.

Paint-on supports

The community feedback is very important to us and for a while the most requested feature was a better way of manually placing supports. And to be able to easily adjust the auto-generated ones. In the past, we’ve added support blockers and enforcers – basic shapes that you could use for better control of support material placement. It was and still is a decent solution to customizing supports. However, the user experience of placing these shapes was, especially with organic-looking models, far from ideal.

The new Paint-on supports tool lets you paint directly on the object and select areas, where supports should be enforced or blocked. It is very intuitive and quick to use. You’ll find the tool in the left toolbar after you switch to the Advanced or Expert mode. After selecting an object and clicking the toolbar icon, all other objects will be hidden so they do not obscure the view. You can adjust the cursor size and paint enforcers/blockers using the left/right mouse button respectively (shift+left mouse button erases painting). You can even visualize overhangs and automatically paint the model based on a set overhang angle. Paint-on supports are also saved in the 3MF project file. So if you share the 3MF with others, they can take advantage of your custom supports. You can see the tool and all its features in our dedicated YouTube video:

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Ironing

The top surface of 3D prints is typically not perfectly smooth. As the nozzle draws the perimeters and solid infill, small gaps and ridges remain visible between the toolpath lines. However, if your model has flat areas parallel to the print bed, you can use Ironing to smooth them. It works best with nameplates, logos, badges, boxes, lids, etc. It has little to no effect on figures and organic shapes in general, but it does increase the print time. So keep it off for such models.

How does ironing work? Ironing smooths flat top surfaces by running a special second infill phase in the same layer. As the hot nozzle travels over the just printed top layer, it flattens any plastic that might have curled up. The nozzle also extrudes a small amount of filament to fill in any holes in the top surface. We have a dedicated article and video about Ironing:

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Monotonic infill

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