CoreXY Ringing
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It looks like you've traded one frequency of ringing for another. DAA has limitations, especially in a corexy where the X and Y axis may have different ringing frequencies. In the end, for my corexy, I had to find a jerk/accel combo that gave good quality on external walls, I also use Cura that allows me to set different jerk/accel per print move, so that infill, etc can be much faster than the walls need to be.
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Hi All,
Quick updated. I spent most of today tuning settings and speeds - mostly in search of good quality and super high speeds.
I added an equal angle to the back of the gantry in the hope of curing some of the vibration, and it's done the trick for sure - which validates the flexing hypothesis.
I reduced the acceleration slightly (at the same time) and started cranking up the speed. I've managed to achieve 300mm/s on a simple thin walled square with only the faintest trace of ringing so I'm thrilled with that result. I did get a problem with under extrusion at about the 200mm/s mark, but I cured that by just turning the nozzle temp up to 220°C, and that cured it.
My final settings were
300mm/s for all surfaces (walls, top and bottom layers).
100mm/s for initial layers.
500mm/s^2 Accel (all conditions)
9mm/s Jerk.I feel like I could go a fair bit higher on the accel, so I'm going to try pushing that a little harder over time.
I do however have another problem (pre-existing)... I'll start a new thread for that to keep this clean.
Thanks all.
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What could cause this? I'm assuming it's a G-Code thing since it wasn't there before.
On my printer (CR10 style) this would be caused by an incorrect pressure advance parameter.
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Hi @jens55 - As above, it seems to be related to the stiffness of the gantry... increasing the stiffness made the problem go away.
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DAA (M593) has an inherent flaw in that it only really works perfectly when there is 0 jerk.
Unfortunately it´s usually the jerk that causes most of the ringing... -
I somehow missed the picture with the final settings when I replied earlier.
That surface finish is incredible! I have never seen finish like that before even at a much lower speed. It's amazing what can be done if you don't sling a 2 kg (or whatever) bed around !Thanks for posting that ....
Hmmmm ..... food or new 3D printer ..... well this seems a good enough reason to go on a diet!
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@jens55 It's worth noting that I was only printing at 0.2mm layer height. It's easy (easier?) to get a nice finish at lower layer height - there's less molten plastic to deal with.
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At 300 mm/sec you can print as fast with 0.2 mm layers as I can go with a 1 mm layer height! It just amazes the hell out of me!
I hope that you might have a chance to share more pictures of your build as it progresses (or when it's ready for prime time). -
@jens55 with acceleration at 500 mm/sec^2 and jerk at 9 mm/sec, the printer probably never actually achieves 300 mm/sec.
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@jens55 said in CoreXY Ringing:
Hmmmm ..... food or new 3D printer ..... well this seems a good enough reason to go on a diet!
With a good multipaterial printer you can print your food!
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@mrehorstdmd The bed is 800x870 so there's plenty of room to move. But you're right, you need a bigger print. I'll increase Accel and Jerk soon - I decreased them to help eliminate those defects initially.
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@Gerrard Now look at corners of a square print- at low jerk and accel they then to get fat and rounded. Everything is a trade off.
