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How to solve the top surface scar in 3D printing

BySteve Lowry 2018-09-28 2735

You may see the nozzle leave traces on the upper surface of the 3D print, as it moves on the surface of the previous layer. This scar was created by dragging the previously printed plastic over the nozzle as it moved to a new position. Now we'll provide some suggestions that which settings can be adjusted to avoid those problems.
Scars On Top Surface in 3D printing

 

Excessive Consumables extrusion

First you need to make sure that your extruder does not have too much consumables. If it dose, each layer will tend to be thicker than the preset.

 

Excessive Consumables extrusion

 

This means that as the nozzle moves through each layer, it can drag over the previously extruded plastic. Before you check other settings, you need to make sure that you have not extruded too much plastic.

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Lift vertically (Z lift)

If you are sure that the extruder is extruding the correct amount of plastic but you still encounter problems with the nozzle dragging on the top surface, then you need to look at the vertical lift settings in the CURA. Turning on this option will cause the nozzle to lift up a distance before moving above the previously printed layer. When it reaches the target position, the nozzle will return to its original height ready for printing. By moving up a certain height, the nozzle can be prevented from scratching the upper surface of the print.

 

Lift vertically

 

To enable this feature, click Tools - Open Expert Settings –Retraction, and there is a "Z hop when retracting", typically set at about 0.5mm. For example, if you enter 0.5mm, the nozzle will always lift 0.5mm before moving to a new position. Please note that ascent will only occur during withdrawal.

 

 You may also want to read:
Creality3D Ender - 3 3D printer FAQ
How to solve 3D print insufficient fill
Spot and scar solution for 3D printouts
Solutions to holes and gaps on the corners of the bottom surface in 3D printing

 

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