The slice settings for Slic3r in MatterControl are divided by three categories:

• General: This is where the settings concerning the actual printed part are located. Things like, layer height, support material, and infill.
• Filament: This is where the settings concerning the filament are located. Things like temperature control and cooling.
• Printer: This is where settings concerning the actual hardware are located. Things like bed size, nozzle diameter, and custom G-Code.

We'll be breaking them down by sub-category, in order, assuming that "Show All Settings" is checked.

If a setting isn't visible, make sure "Show All Settings" is checked.

Layers/Perimeters

Layer Height

Layer Height: This determines the quality of the print in its entirety. The thinner the layer, the higher the resolution. This also is the biggest factor when determining print time.

First Layer Height: This determines the height of your first layer, which is useful in making sure your print has a good starting point. Remember, the vast majority of prints will fail within the first layer.

Vertical Shells

Perimeters (minimum): This determines how many vertical layers you have on your print. i.e. how thick your walls will be.

Spiral Vase: Force the print to have only one vertical layer and gradually increase the extruder height during the print. Only one part can be printed at a time with this feature.

Horizontal Shells

Number of Solid Layers on the Top: This determines how many of the top layers will be solid. This is useful when the infill is lower.

Number of Solid Layers on the Bottom: This determines how many solid layers will be printed before the printer begins to use infill.

Quality (slower slicing)

Generate Extra Perimeters When Needed: Allow Slic3r to generate extra perimeters when needed for sloping walls.

Avoid Crossing Perimeters: Attempts to minimize the number of perimeters crossing. This can help with oozing or strings.

Start At Concave Point: Make sure the first point on a perimeter is a concave point.

Start At Non Overhang: Make sure the first point on a perimeter is not an overhang.

Thin Walls: Detect when walls are too close together and need to be extruded as just one wall.

Advanced

Randomize Starting Points: Start each new layer from a different vertex to reduce seams.

External Perimeters First: Normally external perimeters are printed last, this makes them go first.

Infill

Infill

Fill Density: The ratio of material to empty space ranged 0 to 1. 0 would be no infill, 1 is solid infill

Fill pattern: The pattern used on the inside portions of the print.

Top/Bottom Fill Pattern: The pattern used on the bottom and top layers of the print.

Advanced

Infill Every: Sets which layers will receive infill. This should normally stay set to 1 to make strong parts.

Only Infill Where Needed: Creates infill only where it will be used as internal support.

Solid Infill Every: Sets how often a layer will be forced to be solid infilled. Zero will result in normal infill throughout.

Fill Angle: Sets the starting angle of the infill.Not used when bridging.

Solid Infill Threshold Area: Forces solid infill for any area less than this amount.

Only Retract When Crossing Perimeters: Prevents retraction while within a printing perimeter.

Do Infill Before Perimeters: Sets infill to happen before perimeters are created.

Speed

Speed for Print Moves

Perimeters: Sets the default movement speed while printing perimeters.

Small Perimeters: Used for small perimeters (usually holes). This can be set explicitly or as a percentage of the perimeters’ speed.

External Perimeters: The speed to print the visible outside edges. This can be set explicitly or as a percentage of the percentage of the perimeters’ speed.

Infill: The speed to print infill.

Solid Infill: The speed to print infill when completely solid. This can be set explicitly or as a percentage of the infill speed.

Top Solid Infill: The speed to print the top infill. This can be set explicitly or as a percentage of the infill speed.

Support Material: The speed to print support material structures.

Bridges: The speed to move when bridging between walls.

Gap Fill: Speed to fill small gaps Keep low to avoid vibration. Set to 0 to skip filling small gaps.

Speed for non Print Moves

Travel: Speed to move when not extruding material.

Modifiers

First Layer Speed The speed to move while printing the first layer. If expressed as a percentage it will modify the corresponding speed set above.

Acceleration Control

Perimeters: Acceleration to use on perimeters Set to 0 to disable changing the printer’s acceleration.

Infill: Acceleration to use while infilling. Set to 0 to disable changing the printer’s acceleration.

First Layer: Acceleration to use while printing the first layer. Set to 0 to the default first layer acceleration.

Default: Acceleration to use on all moves not defined above. Set to 0 to disable changing the printer’s acceleration.

Skirt and Brim

Skirt

Loops: The number of loops to draw around all the parts on the bed.

Distance from Object: The distance to start drawing the first skirt loop.

Skirt Height: The number of layers to draw the skirt.

Minimum Extrusion Length: Sets the minimum amount of filament to use drawing the skirt loops. This will cause at least enough skirt loops to be drawn to use this amount of filament.

Brim

Brim width: The amount of brim that will be drawn around each object. this is useful to ensure that parts stay affixed to the bed.

Support Material

Support Material

Generate Support Material: This turns on and off the generation of support material.

Overhang Threshold: The last angle at which support material will be generated. Larger numbers will result in more support. Set to 0 to enable automatic settings.

Enforce Support For First: Generate support material everywhere not touching the bad for n layers, regardless of angle.

Raft

Raft Layers: Number of layers to print before printing any parts.

Options

Pattern: The pattern used while generating support material.

Pattern Spacing: The space between the lines of the support material.

Pattern Angle: The starting angle of the supports.

Interface Layers: The number of layers to print between the supports and the part.

Interface Pattern Spacing: The space between lines of the interface layers (0 is solid).

X and Y Distance: The distance the support material will be from the object in the x and y direction.

Z Distance: The distance the support material will be from the object in the z direction.

Notes

Notes: This is a place to input notes that will be added as comments in the header of the output G-Code.

Output Options

Sequential Printing

Complete Individual Objects: Each individual part is printed to completion then the extruder is lowered back to the bed and the next part is printing.

Extruder Clearance Radius: This is used to figure out how far apart individual parts must be printed to allow them to be completed before printing the next part.

Output File

Verbose G-Code: Include detailed comments in the G-Code.

Output File Name Format: Sets the way that slicer creates file names (this is not used by MatterControl).

Post-Processing Scripts

You can include additional programs to process the G-Code after slicer is finished. The complete path of the program to run should be included here.

Multiple Extruders

Extruders

Perimeter Extruder: The index of the extruder to use for perimeters.

Infill Extruder: The index of the extruder to use for infill.

Support Material Extruder: The index of the extruder to use for support material.

Support Interface Extruder: The index of the extruder to use for support material interface layers.

Ooze Prevention

Enable: This will lower the temperature of the non-printing extruder to help prevent oozing.

Temp Lower Amount: This is the amount to lower the temperature of an extruder that is not currently printing.

Advanced

Extrusion Width

Default Extrusion Width: Leave this as 0 to allow automatic calculation of extrusion width.

First Layer: Setting this to greater than 100% can often help the first layer have better adhesion to the print bed.

Perimeters: Leave this as 0 to allow automatic calculation of extrusion width.

Infill: Leave this as 0 to allow automatic calculation of extrusion width.

Solid Infill: Leave this as 0 as to allow automatic calculation of extrusion width.

Support Material: Leave this as 0 as to allow automatic calculation of extrusion width.

Flow

Bridge Flow Ratio: This controls the ratio of material extruder during bridging. Reducing this slightly can help bridging by stretching the filament more. Using a fan can also help greatly.

Other

Threads: The number of CPU cores to use while doing slicing. Increasing this can slow down your machine.

Resolution: The minimum feature size to consider from the model. Leave at 0 to use all the model detail.

Extrusion Axis: This is the identifier used in the GCde to specify the extruder.

Optimize Overhangs: Experimental feature that attempts to improve overhangs using the fan and bridge settings.

Filament

Filament

Diameter: This should be set to the actual diameter of the filament you are using on your printer. Measure 5 times with calipers, throw out the top and bottom, and average the remaining 3.

Extrusion Multiplier: All extrusions are multiplied by this value. Increasing it above 1 (1.1 is a good max value) will increase the amount of filament being extruded; decreasing it (.9 is a good min value) will decrease the amount being extruded.

Temperature (°C)

Extrude First Layer: The temperature to set the extruder to before printing the first layer of a part. This printer will wait until this temperature has been reached before printing.

Extruder Other Layers The temperature to set the extruder to after the first layer has been printed.

Bed First Layer: The temperature to set the bed to before printing the first layer. The printer will wait until this temperature has been reached before printing. Set to 0 to eliminate bed temperature commands.

Bed Other Layers: The temperature to set the bed to after the first layer has been printed. Set to 0 to eliminate bed temperature commands.

Retraction

Length: The amount that the filament will be reversed after each qualifying non-printing move.

Change Tool: The amount the extruder head will be lifted after each retraction.

Z Lift: The amount the extruder head will be lifted after each retraction.

Speed: The speed that the filament will be retracted (and re-extruded).

Extra Length On Restart: Additional amount of filament that will be extruded after a retraction.

Minimum Travel After Retraction: The minimum distance of a non-printing move that will result in a retraction.

Retract On Layer Change: If set, a retraction will occur prior to changing the layer height.

Wipe Before Retract: This will cause the extruder to move while retracting to minimize blobs.

Retraction When Tool is Disabled (for multi-extruders)

Length: The amount the filament will be retracted when changing to a different extruder.

Extra Length On Restart: Additional amount of filament that will be extruded after a retraction.

Cooling

Enable

Keep Fan Always On: This will force the fan to remain on throughout the print. In general you should have this off and just enable auto cooling.

Enable Auto Cooling: Turns on and off all cooling settings (all settings below this one).

Fan Speed

Min Fan Speed: This is the minimum fan speed that your fan can run at.

Max Fan Speed: This is the maximum speed that your fan can run at.

Bridging Fan Speed: The fan speed to use during bridging.

Disable Fan For The First: The number of layers for which the fan will be forced to remain off.

Cooling Thresholds

Enable Fan If Layer Print Time Is Below: If a layer is estimated to take less than this print, the fan will be turned on.

Slow Down If Layer Print Time Is Below If a layer is estimated to take less than this to print, the movement speed will be reduced to try and make the layer take this long to print.

Min Print Speed: This is the minimum speed that the printer will reduce to, to make the layer tak long enough to satisfy the min layer time.

Print Area

Size and Coordinates

Bed Size: The size of the print bed.

Print Center: The position (coordinates) of the center of the print bed.

Build Height: The height of the printable area. If set to 0 the parts height will not be validated.

Z Offset: This value will be added to all of the z positions of the created G-Code.

Bed Shape: The shape of the physical bed.

Firmware

G-Code Flavor Some firmware uses different g and m codes. Setting this ensures that the output G-Code will use the correct commands.

Use Relative E Distances Normally you will want to use absolute e distances. Only check this if you know your printer needs relative e distances.

Use Arcs: Use firmware arcs rather than multiple segments for curves.

Use G0: Use G0 for moves rather than G1.

Advanced

Use Firmware Retraction: Request the firmware to do retractions rather than specify the extruder movements directly.

Vibration Limit: This is to help reduce vibrations during printing. If your printer has a resonance frequency that is causing trouble, you can set this to try and reduce printing at that frequency.

Custom G-Code

Start G-Code: G-Code input in this field will go into effect as soon as you start a print.

End G-Code: G-Code input in this field will go into effect as soon as a print finishes.

Layer Change G-Code: G-Code input in this field will be inserted right after the change in z height for the next layer.

Tool Change G-Code: G-Code input in this field will be inserted after every tool change.

Pause G-Code: G-Code input in this field will go into effect when the 'Pause' button is pressed during a print.

Resume G-Code: G-Code input in this field will go into effect when the 'Resume' button is pressed after the print having been paused.

Cancel G-Code: G-Code input in this field will go into effect when the 'Cancel' button is pressed during a print.

On-Connect G-Code: G-Code input in this field will go into effect when MatterControl successfully connects to the printer.

Extruder

Extruder 1

Nozzle Diameter: This is the diameter of your extruder nozzle.

Extruder Offset: This is the offset of each extruder relative to the first extruder. Only useful for multiple extruder machines.