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FlexFill 98 print takes 3 times longer?  

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Frank
(@frank-8)
Trusted Member
FlexFill 98 print takes 3 times longer?

I want to print a small cup 50mm diam x 50mm high.  According to my PS2.0 slicer predicted print time, it takes 3 times longer (3hrs vs 1hr) to print this with FlexFill 98 than it does with 'generic PLA.  I checked all the speed settings under 'print settings' and they seem identical.  So why the different predicted print times?

TIA,

Frank

Posted : 26/07/2019 12:51 am
Dave Avery
(@dave-avery)
Honorable Member
RE: FlexFill 98 print takes 3 times longer?

look at the volumetric speed on the filament profile , it's much lower

Posted : 26/07/2019 1:49 am
bobstro
(@bobstro)
Illustrious Member
RE: FlexFill 98 print takes 3 times longer?

As @david-a66 notes, the difference is in the Max volumetric speed setting. The reason that setting is so low is at least partially to avoid shoving filament into the hotend at a faster rate than it can be melted and extruded. This is particularly important with flexibles as otherwise they'll bend in the extruder and likely wrap around the Bondtech gears and generally make a mess. Prusa defaults normal PLA to a rate of 15mm^3/s (which is a bit overly optimistic for a 0.40mm nozzle - 11.5mm^3/s is a bit safer) and your Flexfill 98A to 1.5mm^3/s... a considerably lower rate of extrusion. The lowest includes Colorfabb XT-CF20 at 1mm^3/s. You can experiment with bumping the rate slightly, adjusting temps higher to see if you get reliable prints, but be prepared to roll back if not.

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 : 26/07/2019 2:02 am
Frank
(@frank-8)
Trusted Member
Topic starter answered:
RE: FlexFill 98 print takes 3 times longer?

Thanks for the very informative and prompt reply!  Actually I was getting ready to post again because my FlexFill prints were failing; the filament just stopped feeding at some point and I was getting 'air' prints.  When I pulled the filament out I saw an 'S' turn in the filament, which sounds suspiciously like the problem you mentioned.  Perhaps the default volumetric rate is actually too high on my machine?

TIA,

Frank

Posted : 26/07/2019 2:21 am
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