Shell Thickness

The thickness of your shells (perimeters) around your print can be decided either by giving an absolute width in millimeters, or can be calculated as a number of parallel tracks. In Pathio, shells are (by default) applied to all areas of your print: top, bottom, and sides. Unlike other slicers, this guarantees a uniform thickness on all sides of your print.


Thinner shells will weaken your print, but make it print faster and be lighter.


Thicker shells will improve the strength and surface quality of your print, but increase the time taken and amount of materials used.

Vase Mode

Vase mode sets your model to print with a single outline that prints in a smooth, continuous motion in the Z-axis. This eliminates the start and stop points on each layer (provided you’re only printing a single object, or that your object has a single island while printing). Note that Vase mode overrides your shell thickness and infill percentage.

Vase Mode bottom Layers

This controls the number of layers at the start of your print that will be printed normally before vase mode turns on.


Angle of Solid Surface Fill

Controls the initial direction that the tracks on the top and bottom of your print are drawn. This is largely cosmetic. The slider controls the angle (in degrees) of rotation of the solid-fill tracks.


Solid Fill Rotation per Layer

Controls the amount that the surface fill lines are rotated on each subsequent layer. Typically keeping this at 45 degrees is a good way to ensure your top solid layers print smoothly.


Use Concentric Solid Fill

This lets you draw the solid top and bottom layers of your print concentrically, instead of the default rectilinear pattern.


Un-checking this box will use the default rectilinear patterns for the outermost layers of your print.


Checking this box will use concentric patterns for the outermost layers of your print. This pattern can look better on prints with curved surfaces.

Spiral Perimeter Tracks

This lets you connect your perimeters in a fluid printing motion, instead of treating them as separate tracks.

Checking this box will connect your perimeters in a spiral pattern. This removes retractions in-between the perimeter tracks and improves speed.

Un-checking this box will not connect your perimeters, and they’ll be treated as separate tracks.

Override Top and Bottom Shell Thickness

This turns on a modifier for horizontal shell size. These are what other slicers call the top and bottom layer thickness.

Horizontal Shell Thickness

This lets you define a shell size for your horizontal perimeters (The tops and bottoms of your print), separate from the rest of the shell.


Perimeter Start Point

The perimeter start point can be used to set the starting point of the external perimeter track. This start point position will be applied to all outer shell perimeters in the same position throughout the model layers. Note that this only applies to the outermost perimeter on each island in your print, and that this point is relative to each model’s coordinates.


Inside-Out Perimeters

With the Inside out perimeters setting enabled perimeters are printed from internal to the external perimeters of a model. Enabling this setting can improve the surface finish of outer perimeter tracks and generally helps when printing overhangs, since they’ll have the previous shell track(s) to bond to.


Shell Perimeter Overlap

This controls the amount that shell-fill tracks push into the area already occupied by shell tracks (perimeters). More overlap means stronger connections between the two types of tracks. Too much overlap, though, can cause blobbing where filament is extruded over existing printed lines.