<p>There are multiple parameters because of the trade-off at print speeds.
Slow printing will have less ghosting and a better overall quality, but it takes way more time.</p>
<p>Fast printing will be fast (oh thank you, Captain Obvious), but you will get stronger ghostings and poorer line quality overall. Maybe some strange artifacts.</p>
<p>But you don't need a good print quality in areas that are not visible at all, but you do need it for the outer shell. Also, is the travel mostly just something that you want done as fast as possible but maybe not so fast that that the whole printer starts shaking?</p>
<p>So, you want to set different parameters for different parts.</p>
<p>Next reason: most slicers are used for a large variation of printers, and every printer is a litte bit different—even the same printer type with different addons (like a vanilla Anet A8 vs. a beefed up Anet A8). For the slicer to be able to be used by all these printers, it is necessary to be able to set multiple parameters.</p>
<p>To get deeper into your question about the different infill speeds: if you print a solid infill you will also need to give the printed material more time to cool down, because it is packed tightly and there is not much surface area for heat to get away. If you print these areas too fast you will end up with a part that is too warm and warps and deforms all the time while the next layers were printed on already, inserting even more heat into the part and isolating the warm parts from the outside. You can observe similar behavior when printing overhanging areas with thick walls: there the part will stay in a semi-solid state, and deforms all the time.</p>
<p>But how fast you have to go depends on the cooling system you have on your printer.</p>

CC BY-SA 4.0
2019-04-04T04:17:45.970Z
Thanks, but that doesn't answer my question. I'm not asking why different speeds are important, I'm asking about why do the speeds need to differ by those categories and what their respective impacts are.
kolosy
CC BY-SA 4.0
2019-04-04T05:17:10.800Z
To get deeper: If you print a solid infill you will also need to give the printed material more time to cool down, because it is packed tightly and there is no much surface area for getting heat away. If you print these areas to fast you will end up with a part that is to warm and warps and deforms all the time while the next layers were printed on already, inserting even more heat into the part and isolate the warm parts from the outside. You can observe similar behavior when printing overhanging areas with a thick walls. There the part will stay in a semi solid state and deforms all the time
Horitsu
CC BY-SA 4.0
2019-04-04T05:19:28.137Z
But how fast you habe to go depends on the cooling system you have on your printer.
Horitsu
CC BY-SA 4.0
2019-04-08T10:43:19.207Z
@kolosy I have add the deeper information to my answer :)
Horitsu
CC BY-SA 4.0
2019-04-04T04:01:09.730Z
2021-01-14T22:45:41.807Z
2021-01-14T22:45:41.807Z
Horitsu
<p>The expert mode of Slic3r PE has almost a dozen speed values:</p>

<p><a href="https://i.sstatic.net/GqkFo.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/GqkFo.png" alt="Expert mode speed settings in Slic3r PE"></a></p>

<p>I understand that ultimately print speed at a particular temperature correlates with bond strength, so things like bridges and the first layer having different speeds are reasonable. </p>

<p>What about the rest? Why does infill have 3 variations? How are the different categories listed impacted distinctly from any other form of layer/path bonding?</p>

CC BY-SA 4.0
2019-04-04T14:35:22.267Z
The real answer is: because we love to tinker.
Carl Witthoft
<slicing><slic3r><speed>
Why are there so many print speed parameters in slicers?
kolosy
# Why are there so many print speed parameters in slicers?

(Asked by: username_0 on 2019-04-04)

The expert mode of Slic3r PE has almost a dozen speed values:

[![Expert mode speed settings in Slic3r PE](https://i.sstatic.net/GqkFo.png)](https://i.sstatic.net/GqkFo.png)

I understand that ultimately print speed at a particular temperature correlates with bond strength, so things like bridges and the first layer having different speeds are reasonable.

What about the rest? Why does infill have 3 variations? How are the different categories listed impacted distinctly from any other form of layer/path bonding?

**Tags:** slicing, slic3r, speed
> **Comments:**
> **username_1**: The real answer is: because we love to tinker.  

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## 1 answers

### Answer by username_2 on 2019-04-04. Score: 2 | Accepted answer

There are multiple parameters because of the trade-off at print speeds.
Slow printing will have less ghosting and a better overall quality, but it takes way more time.

Fast printing will be fast (oh thank you, Captain Obvious), but you will get stronger ghostings and poorer line quality overall. Maybe some strange artifacts.

But you don't need a good print quality in areas that are not visible at all, but you do need it for the outer shell. Also, is the travel mostly just something that you want done as fast as possible but maybe not so fast that that the whole printer starts shaking?

So, you want to set different parameters for different parts.

Next reason: most slicers are used for a large variation of printers, and every printer is a litte bit different—even the same printer type with different addons (like a vanilla Anet A8 vs. a beefed up Anet A8). For the slicer to be able to be used by all these printers, it is necessary to be able to set multiple parameters.

To get deeper into your question about the different infill speeds: if you print a solid infill you will also need to give the printed material more time to cool down, because it is packed tightly and there is not much surface area for heat to get away. If you print these areas too fast you will end up with a part that is too warm and warps and deforms all the time while the next layers were printed on already, inserting even more heat into the part and isolating the warm parts from the outside. You can observe similar behavior when printing overhanging areas with thick walls: there the part will stay in a semi-solid state, and deforms all the time.

But how fast you have to go depends on the cooling system you have on your printer.

> **Comments:**
> **username_0**: Thanks, but that doesn't answer my question. I'm not asking why different speeds are important, I'm asking about why do the speeds need to differ by those categories and what their respective impacts are.  
> **username_2**: To get deeper: If you print a solid infill you will also need to give the printed material more time to cool down, because it is packed tightly and there is no much surface area for getting heat away. If you print these areas to fast you will end up with a part that is to warm and warps and deforms all the time while the next layers were printed on already, inserting even more heat into the part and isolate the warm parts from the outside. You can observe similar behavior when printing overhanging areas with a thick walls. There the part will stay in a semi solid state and deforms all the time  
> **username_2**: But how fast you habe to go depends on the cooling system you have on your printer.  
> **username_2**: @kolosy I have add the deeper information to my answer :)  

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