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Can I Use Distance with Marlin 2.X or not?  

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Josefaford
(@josefaford)
New Member
Can I Use Distance with Marlin 2.X or not?

Just trying to find out if i should keep the box checked under printer settings for "Use relative E distance", I'm fairly new to 3D printing and it was checked automaticly when i created the profile for my Ender 5 Pro. But i see that it says unless your Firmware requires it to uncheck it. I have tried searching about Marlin to see if it requires it but I haven't found anything.

Posted : 04/11/2022 6:38 am
cwbullet
(@cwbullet)
RE: Can I Use Distance with Marlin 2.X or not?

You can use marlin 2.0, but it will request custom firmware installation.  I would stick with the stock.  

--------------------
Chuck H
3D Printer Review Blog

Posted : 04/11/2022 8:21 am
Robin
(@robin)
Honorable Member
RE:

Unless you set your Ender 5 Pro to use absolute E values ( https://marlinfw.org/docs/gcode/M082.html ) you should keep that checked.

Normally relative E values are used, because using absolute values will accumulate errors over time and will result in less precise extrusion over time...

If at first you don't succeed, skydiving is not for you.

Posted : 04/11/2022 12:35 pm
towlerg
(@towlerg)
Noble Member
RE: Can I Use Distance with Marlin 2.X or not?

Normally relative E values are used, because using absolute values will accumulate errors over time and will result in less precise extrusion over time...

I wonder why that is?

Posted : 04/11/2022 5:21 pm
Robin
(@robin)
Honorable Member
RE: Can I Use Distance with Marlin 2.X or not?

 

Posted by: @towlerg
I wonder why that is?
Relative movement means telling the extruder how much to move every single time (extrude 2.4mm, extrude 1mm, extrude 3mm…)
Absolute movement means telling the extruder to extrude up to a position (extrude to 2.4mm, continue to 3.4, continue to 6.4…) 
If you have a deviation it will be distributed evenly when using relative movement, but it will accumulate just as the number get bigger when using absolute positioning. 

If at first you don't succeed, skydiving is not for you.

Posted : 04/11/2022 7:44 pm
towlerg
(@towlerg)
Noble Member
RE: Can I Use Distance with Marlin 2.X or not?

I don't understand (very old brain) but thanks for trying.

Posted : 05/11/2022 4:27 pm
Robin
(@robin)
Honorable Member
RE: Can I Use Distance with Marlin 2.X or not?

@towlerg to put it differently: for relative movement you need on information less than for absolute: the current position and for absolute movement you need that to be exact. Walk 2 meters vs. walk from 1233 meters position to 1235 meters. That's only the same when you are at 1233m exactly and are sure about that.

If at first you don't succeed, skydiving is not for you.

Posted : 05/11/2022 4:37 pm
towlerg
(@towlerg)
Noble Member
RE: Can I Use Distance with Marlin 2.X or not?

Thanks for the explanation.

Posted : 07/11/2022 3:26 pm
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