ABS+ tips - is this too hot?
Hi All,
I've just started printing ABS (eSun ABS+) on my MK3S, having mainly used PLA+ and PETG up till now. Actually, I bought some, used it and had massive fails, so have only started again now that I have an enclosure built (Followed the Lack table guide 👍 ). I know I could use Prusament, but eSun is far easier for me to get 😉
Anyway, did some research prior, and had setup the print using Prusa Slicer, and the standard configurations (Prusa ABS for filament and 0.1mm Detail for print settings), which mentioned that they should work with the eSun material. First print was just a Prusa logo, came out good, so wanted to push on with a part that I've been happily churning out with PLA, which is where my issues have begun.
First print was with supports everywhere, second was with some manually added rods for the holes and support on base plate only. The attached image shows the issue, in comparison with standard PLA+ part. Basically the corners in the circled region have got, well, horrendous. The first print is bad, but the second is total junk.
Now between the logo print and this one, I did a bit of research and followed some advice in this link ( https://forum.raise3d.com/viewtopic.php?t=473 ) and bumped the head temp up to 260°C..I'm wondering if I've gone too far, and it's causing what looks like the collapse of the corner. It looks like it's where the perimeters start, so I'm wondering if there is a heat build up in that section, as it is quite small area? 🤔 With the settings used, obviously no cooling fan, so wondering if that is the contributor. Any advice to help combat that?
Anyone have any other advice on what I should be looking at print settings wise for ABS+ to help improve the prints??
Thanks in advance.
Ed
THiNK Fast
RE: ABS+ tips - is this too hot?
I am not certain,
1 first, slower printing speed, helps often, for abs it gets more time to cool down, without fan.
2 Cooling fan at 30-40%, especially for small parts this is needed.
3 Cooling fan and a little hotter extruder, so it sticks better, and cooling fan to cool down fast.
Test also a different test object, so you can test the abs, so it is good quality.
Different brand abs?
RE: ABS+ tips - is this too hot?
Well, a few days of testing, and I've made some good improvements.
Switched to doing a few temp towers to try out different settings. Firstly went with no fan, 220-260°C temps. Saw similar issue, and the unsupported overhangs were pretty rubbish. Next print, tried auto fan, so flicking on to 20% for 10s or shorter layers. Bit of an improvement, but still struggling across the full temp range. Also drew up a 20mm cal cube at 245°C, and ran that, hit the exact same issue in one corner, with it melting and warping.
Third attempt... cooling fan always on (20%), and switched the perimeter start to random... massive improvement, actually looks half decent, and a notable step up in the layer quality as well. Settled on 250°C to start with, Cal cube came out good, so tried the parts I originally tried to print. Much better in terms of definition of the part, but layer adhesion was really low. Thinking to bump the temp up some more (back to 260 or so) to improve the layer adhesion, and should be good. Still needing a little fine tuning, but now feel like working on the right path 😀
Cheers
Ed
THiNK Fast
RE: ABS+ tips - is this too hot?
First of all it would be interesting to know what exactly eSun ABS+ is. Try to dissolve it in Acetone to see how much ABS material is really inside.
So far my best experience with regular ABS is:
- 255C
- ~30-40mm/s
- enclosed chamber
- try to avoid turning the part cooling fan on. If really needed, only 10%
- 0.2 layer height
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