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The software driving your 3d printer

iRapid 3d Printer and Filaments

Repetier-Host Documentation

Object Placement


Prepare all objects you want to print, so your printer can print them. Learn how to arrange them on your print bed. Rotate and scale them to your likes.


Open the “Object placements” tab. You will see the print area on the left side. You start with importing all STL files using the “Add Object” button Add Object. You can select multiple object files at once if you want. This must be in one of the following formats: STL, OBJ, 3DS. The host will always try to position the objects in a non overlapping way onto your bed.

Browsing 3D View

3D View
In this window you see your 3D objects. At the left side, you find some navigation buttons:

The first 4 buttons change the behaviour of the left mouse button. Starting at the top, you get “Rotate” Rotate, “Move Viewpoint” Move Viewpoint, “Move Object” Move Object and “Zoom” Zoom. All funtions can be used with kontrol keys, so that you don’t have to change all the time.

ViewControl: Holding the control button, you can rotate the view with the left mouse button.
Shift: Holding shift button you can move the view point with the left mouse button.
Right Mouse Button: Move the object by holding the right mouse button.
Mouse Wheel: Zoom view

With the next three icons Isometric View Front View Top View you can select between predefined view orientations. You find more view options at the top View menu:

Fit Printer (Strg+A): Zooms to fit the complete printer area into the window with maximum size.
Fit Objects (F5): Zooms to fit all objects into the window with maximum size.
Show Edges (Strg+E): Toggles display of triangulation edges.
Show Faces (Strg+F): Toggles display of triangulation faces.
Show Compass (Alt+C): Toggles display of coordinate compass at the left bottom.
Toggle Printer ID Vies (Strg+I): Toggles the display of the printer ID on top of the right tab. Use this to distinguish the printer wwhen you have more than one host running.

“Use Parallel Projection” Use Parallel Projection toggles between parallel and perspective projection.
“Clear” Clear deletes the marked objects.

Correct orientation and size

Often your objects come with a wrong orientation. To correct the orientation, right click on the object with your mouse to select it. Now you can change the rotation, object scale and position  in the right tab. The position is not really needed, but if you need exact positioning it may be helpful. After entering the value you see the effect in the preview window. If your object vanishes from the screen, press “Center Object” Center Object or “Autoposition” Autoposition to get them back. This happens often with rotations, because the object is rotated around it’s own origin. If an object hovers over the plate, hit “Drop Object” Drop Object to get it in contact with the build plate.

Copying objects

You can make any number of copies from the selected objects. Click on “Copy Object(s)” Copy Object(s) and enter the number of copies you want. Leave “Auto Position after Adding Objects” selected, if you don’t plan to position the objects on your own.

Selecting and moving objects

You can select one object by right clicking on it. If you press the ctrl-key while right clicking  the selected object is added. ctrl-clicking a selected object removes it from the selection.

To move the selected objects, hold the alt-key down while left clicking and dragging the objects. When you select “Top View” Top View from the left toolbar, the movements will follow your mouse movements. If you don’t, the direction of the move is not the same of the mouse movement.

Depending on your configuration, the object may start to pulse or change it’s color, if it is not entirely on the print bed. This should help you identifying printing problems, even before you start slicing.

When you are finished

If you think you need this composition more then just once, you should save Save it as STL or OBJ file. This will store all objects as one object. If you only want to slice this and then forget it, you can skip saving the objects.

Now it’s time to slice your objects. Open the slicer tab and continue there. More on this in the next chapter.

Continue with slicing