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What are the reasons for the holes and cracks in the 3D printing model
2023-07-04 18:35
When building a 3D printed component, each layer is stacked on top of the previous layer. However, considering the amount of plastic used, it is necessary to find a balance between the strength of the foundation and the amount of plastic used. If the foundation strength is not sufficient, we will see voids and cracks between layers. This situation is particularly evident in corners, where the size of the 3D printout changes (such as when you are printing a 20mm square on top of a 40mm square). When you switch to a smaller size, you need to ensure sufficient foundation strength to support the side walls of 20mm blocks. There are several typical reasons for weak foundations, and we will discuss them one by one and provide relevant settings that can improve 3D printing.
Insufficient outer wall thickness:
Increasing the thickness of the outer wall of the printed piece can effectively improve the strength of the foundation. Because the interior of the printed piece is partially empty, the thickness of the outer wall will have a significant effect. Adjust this setting through the "Wall Thickness" parameter on the "Basic" page. For example, originally using a wall thickness of 0.8mm, try using a wall thickness of 1.6mm to see if the gaps disappear.
Insufficient solid layer at the top:
Another common reason for foundation fragility is the insufficient number of solid layers on the top layer of the printed piece. The thin roof is not enough to support the structure printed on it. Firstly, ensure that the "Top Solid Fill" option in the "Expert Settings" is checked. Then adjust this setting through the "Bottom/Top Thickness" on the "Basic" page. If you originally used a top thickness of 0.4mm, try printing a 0.8mm solid layer on the same printed piece to see if the foundation has been improved.
Fill rate too low:
Finally, you need to check your print fill rate and set it in the "Fill Density" section of the "Basic" page. The top solid layer is built on top of the fill, so it is important to have enough fill to support these layers. For example, if the original setting was to use a 20% fill rate, try increasing it to 40% to see if the printing quality has improved.
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