anyone experimenting with linear advance?
 
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anyone experimenting with linear advance?  

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PieterB
(@pieterb)
Eminent Member
anyone experimenting with linear advance?

I noticed that the unreleased firmware has linear advance enabled. Yesterday I compiled a version and updated my MK2. The first results after tuning are great: I set Slic3r to 120mm/s and printed a 0.2mm with 0.07mm roof and letters benchy in about 45 minutes. The benchy was rather good with some minor issue, photos at https://imgur.com/a/yYGRV .

So far so good, this seems to enable really fast print speeds with high quality results. So today I printed one of my own designs, a mostly hollow 3 perimeter mostly cylindrical object, at 0.25mm layer height, set the speed at 115mm/s, increased all acceleration to the default for infill and printed a model of my own, about 56 grams of filament. Completed in 1 hour 44 minutes, so an average flow rate during entire print of about 5.5-6 mm^3/s - not bad at all. The result looks very good: no ringing and very even surfaces - although at this speed it's matte instead of glossy.

The only remaining problem is the z-seam: it looks relatively good, but it seems to have stopped extruding just a tiny bit too soon and/or started too late on both outer perimeters. The one inner perimeter is mostly ok. Problem is, I'd like this part to be relatively airtight without coating it later and it's a bit leaky now.

I'm going to try more settings tomorrow. My question here: is anyone else here experimenting with linear advance? Have you experienced anything like this? Is it just a matter of reducing acceleration or speed, or just better tuning of the K-value?

Veröffentlicht : 01/10/2017 11:06 pm
david.l11
(@david-l11)
New Member
Re: anyone experimenting with linear advance?

I'm using it across 3 Mk2's. I'm having mixed results and sell printed pieces as a side business so its a little stressful. The additional speed is definitely a plus, but having issues with adhesion (going to work on that tonight) and ringing on outer perimeter.

205 / 55-60 on temps, PLA. Extruders and extrusion width tuned on all of them independently.

Attached is a nice new one on a recent print, some sort of bubbling. This is w/ 2 perimeters below.

Veröffentlicht : 19/10/2017 9:56 pm
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