ASA - bridging is good but any kind of overhang is extremely ugly
 
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ASA - bridging is good but any kind of overhang is extremely ugly  

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Sp4rkR4t
(@sp4rkr4t)
Estimable Member
ASA - bridging is good but any kind of overhang is extremely ugly

Hello all, I'm playing around with some filamentum ASA extrafill with the eventual goal of replacing a couple of hot end pieces when Revo turns up (I've already printed the pieces in PETG in case I can't get it done with my current setup). I spent yesterday getting bridging to a place I'm happy with in that is can bridge at least 30mm with no issues however it's overhangs that are really killing me right now, or to be more specific any surface at an angle looks really rough.

 

I've included the .3mf I'm working on. This attempt I printed at 75% speed but that made little to no difference at all, I'm printing inside a solid wood enclosure and I let the air get warm for a bit before I start the print on the smooth sheet with a touch of window cleaner on so I can get the parts nice and easy. Print temps are 85 for the bed and 245 nozzle using a .6mm nozzle.

x-carriage-duct ASA

Posted : 31/01/2022 10:17 am
Bob
 Bob
(@bob-2)
Reputable Member
RE: ASA - bridging is good but any kind of overhang is extremely ugly

That looks terrible, you've got z-banding, what looks like over extrusion, what looks like poor part cooling. 

I've never used ASA so I don't know how to advise, did you review the Prusa Materials guide on this stuff?

https://help.prusa3d.com/en/article/asa_1809

Good luck

-Bob

Prusa I3 Mk2 kit upgraded to Mk2.5s, Ender3 with many mods, Prusa Mini kit with Bondtech heat break, Prusa I3 Mk3s+ kit

Posted : 02/02/2022 3:19 am
mark
 mark
(@mark-3)
Reputable Member
RE:

ASA absolutely must be dried before printing. It absorbs water faster than other materials. It also is just not good for objects such as you show. Sharp edges at the top of prints can be very good, but I have never had good overhangs or bridges. I only use it to print objects that get smaller as they go up, or I cut them into pieces where the base is larger and glue them together with Acetone. Objects like you show are better printed with other filaments.

Here is what you can expect with dried filament and objects that don't have overhangs or bridges:

Bottom line though, dry ASA right before printing or results will be poor.

Regards,

Mark

Posted : 05/02/2022 3:20 pm
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