Modifiers | Prusa Knowledge Base

In some cases, you might want to change some settings just for a specific section of your model. For example, you might want part of your model to have denser infill or more perimeters for increased rigidity. But you don’t want to adjust these settings globally, because that would waste a lot of material and increase the print time.

There are multiple ways to specify which section of the model should be affected by the custom settings. You can use a height range modifier, a simple modifier mesh primitive (e.g. cube), or a custom model modifier mesh.

Height range modifier

Right-click on a model and pick Height range modifier from the context menu.

A new menu will appear on the bottom right of the page called Height Ranges. Here you set intervals, between which you can apply different settings. When you set an interval, it will appear in the Object list above.

You can add or remove intervals with the orange plus and minus icons.

When you click on the gear icon next to the interval, you can choose to set up:

Normal mode - custom Infill and Layers and perimeters

Expert mode - custom Infill and Layers and perimeters, and in the Add settings it is also possible to choose Speed, Ironing, Fuzzy Skin, Extrusion Width, and Advanced

The interval setting also features a layer height input. By default, the global layer setting is used, but you can choose to slice the model at a different layer height and only the interval will be affected by this change. Keep in mind that if you set up a different layer height for the entire model, on the height interval it will be overridden by this value.

Modifier meshes

Modifier meshes apply custom settings to the intersection of the modifier mesh and the model.

Right-click on a model and pick Add modifier - [Select modifier type]. Alternatively, you can right-click on the gear icon in the Object list panel. It is possible to choose four primitive shapes (box, cylinder, sphere, and slab), add text, add SVG, or add a modifier from the Program gallery. In expert mode, it is also possible to Select Load and add a custom shape as a modifier mesh.

When you pick the modifier shape (e.g. cube) it will appear in the 3D view and the Object list in the right panel. You can use the Move, Rotate, Scale tools to transform the modifier mesh.

Changing settings for the modifier mesh

You can either right-click on the modifier in the 3D view or click on the gear icon in the Object list panel to select:

Normal mode - custom Infill and Layers and perimeters

Expert mode - custom Infill and Layers and perimeters, and in the Add settings it is also possible to choose Speed, Ironing, Fuzzy Skin, Extrusion Width, and Advanced

If you scale the model then both model and modifier-mesh will scale. Modifier-mesh will retain its size and position relative to the model. It is possible to reach many different looks for the same printer with the modifiers.

A modifier mesh in the shape of a rectangle that removes top and bottom solid layers and another one in the shape of a plane that turns them back on and changes the extruder to number 2 (printed with the MMU2S)

Place modifier on bed

If you moved a modifier above the print bed you can use the button in the Part manipulation panel to place it back down.

21 comments

Dan82

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When using the Height Range Modifier (HRM), it seems as though the "First Layer Thickness" value in slicer's global setting supersedes any value you put in the HRM for layer 0 to x. Can anyone comment? Also, the sentence that says: "Keep in mind that if you set up a different layer height for the entire model, on the height interval it will be overridden by this value" is a bit confusing. The words: "this value" should be replaced with: "the HRM Value..." just to be very clear. Lastly, there is a question regarding the layer values of, say, 0 to 5 in that it refers to 0 to 5 mm (not layers). If that's the case, and you specify, say, 0 to 5mm and select a layer height of, say, 0.15mm; 0.15mm doesn't divide into 0.5mm evenly. So what actually happens relative to actual height at that 5mm mark?

Marshall

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Regarding the fact that height range modifier layer height overrides the global setting-- I think this is pretty non-intuitive behavior. In fact I wish you could NOT specify a layer height for the height range modifier, and have it default to the global setting. Normally I want to change something else with the modifier - like the infill % - and want the layer height to just follow whatever the global print settings say. Currently, I have to remember to update the modifier layer height if I decide to try a different global layer height.

Cole Davidson

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Is it possible to bump the temperature up or down a few degrees for a certain height range? I don't see a temperature modifier but is there another way?

Avinash

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I have found a way to do so. Take a look at this link: every time you change the temp this way, that layer and the layers above will remain that temp until changed again.
https://all3dp.com/2/prusaslicer-temperature-tower/

Paul D

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Bonjour, Après avoir disposé des cylindres permettant de modifier le nombre de parois ainsi que son remplissage, j'ai remarqué que la pièce finale est imprimé en deux temps (la pièce initiale dans un premier temps puis les cylindres générique). Cependant, la pièce requiert des caractéristiques mécanique importantes qui pourraient etre compromises a cause de ça. Est-ce possible de fusionner la pièce avec les modificateurs afin que les périmetres de la pièce initiale et des cylindres soient imprimées en une seule fois ?Merci

MartinD

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I'm printing a tube (essentially a hollow cylinder). How would I increase the perimeter count on the inside wall of the tube? I added a modifier cylinder. I placed and sized it so the only perimter it intersects is the inside wall of the tube. I set perimeter count to 2.
When I slice the model, I do get 2 perimters on the inside wall of the tube as I wanted, but I also get 4 perimeters at the boundary of the modifier shape (the modifier cylinder).
Is this how modifiers are supposed to work? I expected that the modifier would only change perimeter count where there was already an existing perimeter. In my case, the modifier is adding a perimeter which happens to be inside the shape.

Marina Curzi - Official Prusa CS

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Please contact our technical support and send them the 3mf file of your project to check how to proceed.

Bruce Labitt

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Is there a way to create a hollow cylindrical modifier? I'd like to create an infill density that roughly depends on the radial distance. If there was a way to create a cylindrical shell it would be useful to me. In my case, I'd like minimal density towards the center and maximal density at some radius r.

ktmom

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I think you just want to use a custom mesh that you create and import.
"Additionally, in the expert mode, you can use a custom shape as a modifier mesh by selecting Load … in the mesh selection. This mesh is typically something you’ve modeled beforehand in a 3D modeling program."

pcmdanb

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A parametric annular object would be pretty useful for setting extended 100% infill around holes. It wouldn't be as simple as just scaling a cylinder's size, so I'm not sure how you'd have to set up the interface for it, but if there's any "standard" "custom" object to build into the program itself, that would certainly be it.