> For the complete documentation index, see [llms.txt](https://wiki.polymaker.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.polymaker.com/polymaker-wiki/polymaker-wiki-zh/da-yin-ji-qiao/material-science/overhangs.md).

# 悬垂

尽管建议对悬垂角度使用支撑，但能够打印高质量的悬垂表面通常可以节省时间和材料。

打印悬垂表面时的挑战在于实际无支撑区域的大小。如下图所示，相同的角度根据层高不同会产生不同的无支撑区域。看起来无支撑区域越小越好，然而，层高越小，无支撑区域的刚性就越差。这始终是刚性和无支撑区域大小之间的平衡。

不同的因素会影响悬垂表面。如下图所示，两种主要力将作用于无支撑区域：其重量 (F1) 和聚合物应力 (F2)。

![](https://attachments.gorgias.help/vo0l5/hc/g8y3/overhangs-0b2e1f9e-6905-4636-9eff-6a39bdcf5c02.png)

影响这些力的主要因素已在上面总结，然而，一般来说，最佳的悬垂表面将通过高层高（更高的刚性）、低打印速度（更一致的挤出）和高挤出率（更一致的挤出）来实现。


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