Prusa i3
User guide for the Prusa i3 MK2S 3D printer.
Step-by-step 3D printing guide.
This section will take you through the complete process of downloading an object to 3D printing the object.
- Download or export the object that you want to print in STL format.
- Open Slic3r
- Drag the STL file into the main area.
- Orient your object by right clicking on it and using the rotate options
- Select the desired level of detail (layer height)
- Select the type of filament to be printed on

- Optionally enable a brim or supports. Refer to relevant sections.
- Click send to printer
- Open OctoPrint
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Find the gcode file in the Files window
Note
The gcode file name is based on the STL file name.

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Ensure the bed of the printer is clear, and ready for printing.
- Ensure that the correct type of filament, and a sufficient amount to complete the print is loaded.
- Click Print
Changing the filament
- Home the hotend by going to the Control tab, then clicking the
under Z. - Centre the hotend by clicking Centre Hotend under the Control tab.
- Heat the hotend to a temperature hot enough to remove the old filament, and to insert the new filament.
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Unload the old filament:
- Under the Control tab, enter the length in mm to retract
- Click retract
- Click the wheel
- Select Unload filament
- Click the wheel
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Load the new filament:
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Under the Control tab, enter the length in mm to extrude
Note
100mm-120mm is usually sufficient
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Click extrude.
Tip
If the colour isn't clear, keep extruding by small amounts until the colour is clear.
- Click the wheel
- Select Load Filament
- Follow the prompts to ensure that the colour is clear
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Done