Calibrating linear advance on smaller nozzles
 
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sverzijl
(@sverzijl)
Active Member
Calibrating linear advance on smaller nozzles

For fun I've been printing on a 0.15 mm nozzle and I've been impressed with the results so far.

I'm trying to find tune my set up and I would like to adjust linear advance. My problem is that with the thinner lines it is really difficult to see the changing thickness. 

Does anyone know of another calibration method?

Yonks ago I saw a post about people printing patterns on the external surfaces of a print by varying the print speed. Someone had worked out that a properly calibrated linear advance prevented any pattern from displaying. It sounded like there were once websites that allowed you to supply an imagine and it would generate a G-Code - but they must have lost favour as I haven't been able to find any. Maybe this is an avenue?

Posted : 14/12/2020 2:45 pm
bobstro
(@bobstro)
Illustrious Member
RE: Calibrating linear advance on smaller nozzles

I did a Linear Advance calibration tower. It takes a while and a lot of filament to print. Basically, inserted M900 Kxx gcode commands based on current Z position in custom gcode. Here's what the old LA1.0 tower looked like.

 

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 : 14/12/2020 7:06 pm
sverzijl liked
sverzijl
(@sverzijl)
Active Member
Topic starter answered:
RE: Calibrating linear advance on smaller nozzles

@bobstro

That's awesome. Just made one now. I also found a thread you started discussing it.

One quick question, was the only thing unique you did with the profile the minimum layer time to prevent it slowing down?

Thanks in advance!

 

Posted : 16/12/2020 10:14 pm
sverzijl
(@sverzijl)
Active Member
Topic starter answered:
RE: Calibrating linear advance on smaller nozzles

@bobstro

Tried my tower from K0.0 to K20.0 but I didn't see a difference.

Anything I'm missing?

Posted : 17/12/2020 11:40 am
Neophyl
(@neophyl)
Famed Member
RE: Calibrating linear advance on smaller nozzles

Rosie a normal prusa mk3 printer profile basically has a line in the start gcode setting it to 0.95 for layer heights above 0.075 and 100 if below that.  So you could say its 'standard' for a mk3 printer.  It's also the same for the mini too so its obviously something that Prusa thinks gives better results on their printers.

 

sverzijl  As for the LA tower.  Bob did mention that it was for LA1.0.  That uses values from 0-big numbers.  Like 0,5, 10, 15, 20 etc.  LA1.5 which newer versions of marlin firmware use (like later versions of the MK3 series also now use) have numbers that go from 0-1.  So you would set much smaller increments like  0.1,0.2,0.3,0.4 etc (or finer once you narrow it down).  If you were using the big number and your printer uses LA1.5 then you wouldn't see a difference.

Posted : 24/12/2021 11:41 am
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