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Ultimaker 2+ Estep calibration with data, variance ok?

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Posted · Ultimaker 2+ Estep calibration with data, variance ok?

Hi

I've spent the evening working with estep calibration on my UM2+
Below are the results. I hope you understand the data 🙂
The time the extruder ran was as perfect as I could measure each time. (And it seems my response time is always very close to 0.15 seconds 😉 )

First of all a notice on what I assume is some kind of bug. The first extrusion run after every M92 change of the estep value, gives a way off result. 
So, I have tested three extrusion lengths 100mm, 200mm and 300mm. It seems the longer extrusion run, the less filament is extruded. So, at the third and last setting in the data below, at E100, I tend to get 101-102mm, at E200, it's more or less spot on, and at E300, it is 2-4mm too short. So, where talking about +- 2%. Is that a normal variation? Though the variation seems to be related to the extruded length, so it is not random.

Starting off with default estep = 369

E369       
E200 F500 216mm  
E200 F1000 206mm  
E100 F100 203mm  
E100 F100 102mm  
E200 F1000 204mm 12s
E200 F1000 204mm 12s
E200 F500 204mm 24s
E100 F500 103mm 12s
E100 F100 103mm 60s
E200 F750 205mm  
E200 F750 205mm 16s
E200 F750 205mm 16s
M92 360      
E200 F750 137mm 11s  !!!!!
E200 F1000 200mm 12s
E200 F1000 201mm 12s
E200 F1000 200mm 12s
E100 F100 101mm 60s
E100 F100 102mm 60s
E100 F500 102mm 12s
E100 F1000 101mm 6s
E100 F1000 103mm 6s
E100 F1000 102mm 6s
E200 F1000 201mm 12s
M92 355.76    
E200 F1000 150mm 9s  !!!!!
E200 F1000 200mm 12s
E200  F1000 200mm 12s
E100 F100 101mm 60s
E100 F1000 101mm 6s
E100 F1000 101mm 6s
E100 F1000 102mm 6s
E200 F1000 200mm 12s
E100 F1000 102mm 6S
E100 F500 102mm 12s
E100 F100 102mm 60s
E300 F1000 296mm 18s
E300 F1000 298mm 18s

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Posted · Ultimaker 2+ Estep calibration with data, variance ok?
9 hours ago, X-Type said:

First of all a notice on what I assume is some kind of bug. The first extrusion run after every M92 change of the estep value, gives a way off result.

 

For older versions of Marlin (like the one that is used in UM2) the current axis position is lost after M92 (or better: is not longer accurate).

Don't use M92 on its own, always send a subsequent G92 Exxx.xx to reset the position.

 

9 hours ago, X-Type said:

So, I have tested three extrusion lengths 100mm, 200mm and 300mm. It seems the longer extrusion run, the less filament is extruded.

 

I don't know the specific reason why you took all these measurements, but i think the used speeds are way to fast and the filament probably just slips more and more the longer the move takes.

I would use an equal (and lower) speed for all tests. Let's say F180 or even slower (somewhat closer to 'normal' extrusion rates). The variation should be much smaller then.

 

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Posted · Ultimaker 2+ Estep calibration with data, variance ok?

Thanks for input, I will give it a try and run some different extrusion lengths using a slow speed, and see what results that gets me 🙂

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