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Smart wipe tower

The smart wipe tower ensures sharp color transitions and stable filament flow after a color change while aiming to waste as little filament as possible. There is always only one wipe tower no matter how many objects are being printed at once.

The size of the wipe tower is independent of the size of the object being printed.

Printing multiple copies at once or printing big objects improves the overall efficiency of the filament used.

Wipe tower placement

As soon as you select a multi-material printer in the Printer selection box, the smart wipe tower will appear in the 3D view. The preview shows its maximum footprint, because the size may decrease after slicing, based on the number of color changes in each layer. The size will decrease from the edge with the polyline. You can change the placement of the wipe tower by dragging it with the left mouse button. Make sure the wipe tower doesn’t intersect any of the objects.

To shorten the travel moves between the object and the wipe tower, place it in the near proximity of the object/objects.
The real size of the wipe tower is visible in the G-code preview

Wipe tower size

In Print settings - Multiple Extruders - Wipe tower you can set the Width of the wipe tower. The other dimension is calculated automatically based on the amount of filament necessary to purge.

The purge amount can be set by clicking on the Purging volumes... button in the right panel.

The wipe tower is rarely solid. Instead, the ratio of sparse and dense infill is automatically adjusted every layer, based on the current number of color changes, in order to waste as little filament as possible.

Wipe tower ramming line

If you see a line in the air above the Wipe tower, that's normal. It's the visualization of the final extruder ramming before it unloads the last used filament (in order to create a sharp tip).

Wipe tower without sparse layers

The wipe tower size can be reduced by skipping the sparse layers (layers without a tool change). This saves material and in almost all cases reduces the print time.

  1. Go to Print settings - Multiple extruders
  2. Tick No sparse layers (EXPERIMENTAL)

On our set of multi-material projects, this feature reduced the total print time by 3.16%, and the filament deposited on the wipe tower was reduced by 16.17%.

The wipe tower without sparse layers feature is very useful together with ColorPrint with the MMU. Only a handful of filament switches are needed to print a colored sign unattended and as a result, a lot of material is saved compared to a full wipe tower.
Turn off Crash detection if you're using a wipe tower without sparse layers. Otherwise, you're risking a potential collision between the x-axis and the printed object during crash recovery.
 As PrusaSlicer currently does not check for collisions of the extruder with the printed object when lowering down to the top of the wipe tower, this feature is marked as experimental, and it is recommended to place the wipe tower to the rear right corner of the MK3S's print bed, while the object is placed to the opposite corner.

Wipe to infill

Since the inside of the model isn’t visible, it can be used to wipe the nozzle during the color transition. The wipe tower cannot be eliminated completely, because some models do not have enough infill, but wipe to infill can greatly reduce the amount of wasted material.

  1. Right-click on a model in the 3D view.
  2. Choose Wipe options.
  3. Then in the right panel tick Wipe into this object’s infill.
Dark filament purged into infill may be visible through light-colored walls. To avoid this issue, we suggest increasing the number of perimeters.

Wipe object

To further decrease the amount of material used for the smart wipe tower, you can choose to wipe residual filament into an object. The so-called ‘wipe object’ will be used during the color transition to wipe the nozzle. As a result, the colors of the object will be mixed - this is handy in case you don’t care about the surface color (e.g. mechanical parts).

  1. Right-click on a model in the 3D view
  2. Choose Wipe options.
  3. Then in the right panel tick Wipe into this object

Wipe object taller than the multi-colored object
The wipe object will be finished with the last filament used during the multi-colored print.

Multi-colored object taller than the wipe object
After the wipe object is finished printing, wiping will move to the smart wipe tower.

During a color change, the flow isn't perfectly stable. For example, a tiny amount of air can get trapped in the nozzle as the new melted material pushes from the top. As a result, slight artifacts can appear on your wipe object.

The footprint of the wipe tower is minimal thanks to the wipe object (gear)

Stabilizing cone

The wipe tower can optionally be printed with a “stabilization cone”, which prevents it from toppling over. This feature is especially useful when the wipe/priming tower is very small in footprint, but can reach great heights, as on the Original Prusa XL.

The apex angle of the cone is adjustable in Print Settings-Multiple Extruders-Wipe tower. Setting the value to zero disables the cone.

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