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Multicolour printing with one hotend using hardware

Multicolour printing with one hotend using Slic3r

Multicolour printing with one hotend using Slic3r requires manually changing the filament on each layer that more than one colour exists, for this reason it is most suitable for achieving multicolour prints where only a small number of layers are multicolour e.g Inlay.

Slic3r Printer Settings

Rather than modify your default settings, Slic3r allows you to create profiles to achieve different functionality.

Printer settings

Open Slic3r

Select Printer Settings

Click the Save icon next to the printer name

Enter a new name of Multicolour ….. whatever you want to call it

You will now have a new Printer setting alongside the original ones that Prusa supplies

Extruder settings

On the General | Capabilities Section is a heading Extruders

Increase the number of extruders as per how many colours you may want to print with on a single print based on the number of filament changes. You can have more extruders than you are going to use, 6 extruders is fine if only printing in 2 colours, Slic3r ignores the excess extruders.

Once modified you will see that the left hand Viewing Pane also now has 6 extruders

By default, if you select and of these extruders, you should not have to adjust any default settings from your normal printing.


Tool change G-Code

Now set a custom G-Code that runs for what Slic3r thinks is a tool change. Select Custom G-Code on the left hand Pane and then scroll down on the right hand side to Tool Change G-Code.

In the Tool Change G-Code box, enter M600 and click the save next to your printer settings name again to save all the changes made.


Parts design

The aim of this step is to have a separate exported STL file, for each part of your print that will be a different colour.

When just adding personalised text, you do not need the text height to be more than two layers. E.g if you are going to print at .20 then only make your text .4 deep and when sliced it will become 2 layers. If you are printing at .15, then make the text .30 and so on.

The overall aim is to achieve two stls.