Notifications
Clear all

E-LC and the Benchy Hull Line  

  RSS
Sink
 Sink
(@sink)
Estimable Member
E-LC and the Benchy Hull Line

Like many I have struggled trying to figure out why on one machine, the benchy prints beautifully with no hull lines, yet on the another, same make, model, and firmware, 1 week age difference between the two, the hull line is there.

Prusa and others points at changes in  infill, between layers, speeds, etc ..

Playing with my "problem MK3s+"and continuing my investigation of banding and E-LC, I changed the E-LC to 1.08 and the picture is the result.

Granted, not a full investigation and not a rigorous testing of values and layer heights, etc ., but this does point toward a reason as machine based, not necc. slicer.

Stepper motors, drivers, micro-stepping, magic number all seem to be possible factors somewhat compenstaed for by playing with the E-LC numbers?

Posted : 25/05/2021 7:21 am
--
 --
(@)
Illustrious Member
RE: E-LC and the Benchy Hull Line

@sink

You've left out a major variable: the filament itself.  It's easy to think that filament is the same beginning of spool to end of spool. It isn't. I see color changes in the left Benchy that can only be changes in filament (or a remarkable trick of light).

Also - you aren't showing the same side of the print, so the comparison is invalid on that alone.

Apples to Apples. Or whatever that saying is.

 

Posted : 25/05/2021 3:50 pm
Sink
 Sink
(@sink)
Estimable Member
Topic starter answered:
RE: E-LC and the Benchy Hull Line

@tim-2

Same roll of filament, Prusament Vanilla White, is semi-translucent and it is a trick of light. Use this stuff mostly for illuminated lamp shades and the such...

If you wish to invalidate the results based upon the wrong side, so be it.. won't bother you guys again, it is the same on both sides btw.. but no worries won't bother you again

Posted : 25/05/2021 3:58 pm
--
 --
(@)
Illustrious Member
RE: E-LC and the Benchy Hull Line

@sink

Not invalidating anything, I just know that such comparisons are difficult to do correctly, like any precision measurement. Any change in conditions must be properly accounted for before any conclusions can be made. Ask Pons & Fleischman. 

For example: Prusament is no different that any brand - and the filament can change meter by meter. The raw plastic is consistent by the ton, but gram to gram there will be variations. Same is true of spun filament. The hopper isn't homogenous, it gets refilled with different batches of raw filament, so the extrudate changes as spools fill.  Sure, it's pretty good, but it isn't perfect.

And - as you probably well know - printing on a Mk3 means the print is being cooled on only one side. So a comparison of the front of a print to the back of a print is an automatic disqualification.   So just flip one of the parts over so the same side is viewed before making judgements.

So no - being skeptical doesn't mean you are wrong; rather, it means in this case I've been there done that and found that there are lots of small things that can mislead conclusions that otherwise seem logical, and I have learned to ask questions. If your finding hold up to the questions, then you've discovered something (or rediscovered something 🙂 ).

 

This post was modified 6 months ago 2 times by --
Posted : 25/05/2021 4:09 pm
Seppel
(@seppel)
New Member
RE: E-LC and the Benchy Hull Line
Posted by: @sink

Playing with my "problem MK3s+"and continuing my investigation of banding and E-LC, I changed the E-LC to 1.08 and the picture is the result.

 

This might sound dumb but: What is E(xtruder)-LC?

 

 

Posted : 22/06/2021 5:30 pm
ktm1090 liked
ktm1090
(@ktm1090)
Active Member
What's E-LC?

 

Posted by: @seppel
Posted by: @sink

Playing with my "problem MK3s+"and continuing my investigation of banding and E-LC, I changed the E-LC to 1.08 and the picture is the result.

 

This might sound dumb but: What is E(xtruder)-LC?

 

 

 

I want to know the same thing.  What is "E-LC"?

Posted : 05/09/2021 1:39 am
bobstro
(@bobstro)
Illustrious Member
Extruder linearity correction perhaps?

Extruder linearity correction is all that comes to mind, but I wouldn't expect it to halp with this issue.

My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 05/09/2021 1:53 am
Dan Rogers
(@dan-rogers)
Noble Member

Benchy is not a test you have to pass.  Besides I don't see anything wrong with either of those benchies.  Maybe the picture is blurry.

Posted : 05/09/2021 7:04 am
cwbullet
(@cwbullet)
Illustrious Member
benchies

 

Posted by: @sink

I concur.  I would be happy with these Benchies.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 05/09/2021 10:52 am
Share: