Material

Default printing temperature

This is the printing temperature of the materials as found in the materials panel, without any corrections applied to it.

Printing temperature

This is the temperature of the nozzle that is used during printing, calculated by the flow of the material. Each printing profile has a slightly different printing temperature to create the best print result.

Printing temperature initial layer

This is the printing temperature of the layer that adheres to the build plate. Printing slightly warmer increases the adhesion between the build plate and the model.

Initial printing temperature

This setting is only used in dual extrusion machines. When switching nozzles, the inactive nozzle cools down to the standby temperature. During the warm up, the nozzle is allowed to start printing when this temperature is reached. The temperature is slightly lower than the printing temperature since the filament already obtained heat from the nozzle for a longer period of time.

Final printing temperature

This setting is only used in dual extrusion machines. When switching nozzles, the inactive nozzle has to cool down. Just before the nozzle switch, the nozzle is allowed to cool down to this temperature while continuing to extrude.

Initial-final-printingTemperature

Extrusion cool down speed modifier

The number here indicates how much faster the nozzle cools down when extruding. The extra heat lost by extruding hot filament is compensated this way.

Build plate temperature

For printers with a heated bed the temperature of the heated bed can also be set here. We recommend using 60 °C for PLA and CPE and 90 °C for ABS to ensure the plastic sticks well to the build plate.

Build plate temperature initial layer

This is the build plate temperature during printing of the layer that adheres to the build plate. A slightly warmer build plate during the initial layer reduces the chance of warping.

Diameter

In this field you can enter the diameter of the filament, so that Cura calculates the extrusion rate correctly. All Ultimaker filaments have a diameter of 2.85 mm, but it might be necessary to change this setting when using filament from other suppliers.

Flow

The flow is the amount of material that needs to be extruded per time unit and is based on the filament diameter and print speed. The flow is always set to 100%, which means that the extruded amount of filament will match the calculated necessary amount. This setting is hardly ever changed, as the calculation is done automatically, but it can help increasing the flow slightly when using flexible filaments.

Please note that it is not advised to increase the flow to compensate for under extrusion. This will only work temporarily and won’t solve the cause of the under extrusion.

Enable retraction

Retraction is used at the places in a print where the printer has to do a travel move between two printed parts. Without retraction, extruded material will hang between the parts. This means that the filament is pulled back by the feeder so that it doesn’t leak from the nozzle during the travel moves. By using retraction, “stringing” (thin threads of plastic in between the printed parts) is prevented, resulting in a much cleaner final model. You have to be careful with flexible materials or models that require a lot of retractions, as that might lead to grinding of the filament.

Retract at layer change

This setting forces the printer to retract the filament before it starts printing the next layer.

Retraction distance

The distance in millimeter the material is retracted out of the nozzle. A long retraction creates more stress on the material and minimizes oozing. A short retraction has an increased chance of oozing while keeping the material safe.

Retraction speed: retract and prime

The speed in millimeter per second at which the material is retracted and primed. A high-speed retraction causes the material to grind and minimizes oozing. A low-speed retraction has an increased chance of oozing while keeping the material safe.

Retraction extra prime amount

This is the extra amount of material that is extruded after a retraction to compensate for oozed material after a travel move. Especially with flexible filaments, this setting can be useful, as these need a lot of pressure to print properly. By increasing the retraction extra prime amount you basically add extra pressure which could help compensate.

Retraction minimum travel

This setting determines the minimum distance the print head must travel before a retraction move is initiated. With retraction-intensive models it might be wise to increase the value to decrease the number of retractions and thus the chance of grinding. On the other hand, the value should not be too high as this might lead to stringing and ugly “blobs” on the print.

Retraction-Minimum-travel
This is a cross section of a model with short retraction moves.

Maximum retraction count

The maximum retraction count sets the maximum number of retractions on a certain length of filament (see minimum extrusion distance window). All retractions above this value will be ignored. The benefit of maximizing the amount of retractions is that it decreases the chance of grinding. But with models with a lot of holes (e.g. a voronoi print), this can lead to more stringing if the value is too low.

Maximum-retraction-count
Cross section of the feeder.

Minimum extrusion distance window

This is the length of filament over which the maximum retraction count is enforced. A logical value would be similar to the retraction distance, which is set on your Ultimaker (except for the Ultimaker Original+ and Ultimaker Original).

For example: if you set the maximum retraction count to 10 and the minimum extrusion distance window to 5.5 mm, it will do a maximum of 10 retractions per 5.5 mm extruded filament.

Standby temperature

The temperature set for the nozzle that is in standby mode while the active nozzle is printing. A high temperature causes oozing on the standby nozzle, a low temperature increases the warm up time when the nozzle continues printing.

Nozzle switch retraction distance

The length of the retraction of the filament when the nozzle goes into standby mode.

Nozzle switch retraction speed: retract and prime

The speed of the retraction move when the nozzle goes in standby mode.

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