Nerfed acceleration on rev E?

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abrasive
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Location: UT, US

Nerfed acceleration on rev E?

Post by abrasive » Fri Mar 24, 2017 5:11 pm

Hi, new guy here. Just received my M2 a few days ago. This is my first 3D printer and I am already glad I "went big" and bought something solid straightaway. I was printing within two hours of delivery, and probably would have been faster but I am slightly gimped-up at the moment.

Yesterday I printed a Benchy, and have been scraping through settings, trying to optimize things. I found some discussion about acceleration tuning, and I dumped my firmware settings for a baseline, thinking I might drop the rates a bit to improve quality and theoreticallyy reduce machine wear. To my surprise, the defaults were already quite low. Is this what is shipping in the M2 config now? (See below)

This was dumped from a freshly "booted" state on the M2, if that makes a difference. M501 shows the same thing, as expected.

Just looking for a sanity check here. I am currently at 900mm/s^2 and 1000mm/s^2 max for X and Y, respectively? Straight out of the box?

Thanks,
Dave

Code: Select all

Send: M503
Recv: echo:Steps per unit:
Recv: echo:  M92 X88.88 Y88.88 Z1007.70 E471.50
Recv: echo:Maximum feedrates (mm/s):
Recv: echo:  M203 X200.00 Y200.00 Z25.00 E25.00
Recv: echo:Maximum Acceleration (mm/s2):
Recv: echo:  M201 X900 Y1000 Z30 E2000
Recv: echo:Acceleration: S=acceleration, T=retract acceleration
Recv: echo:  M204 S2000.00 T3000.00
Recv: echo:Advanced variables: S=Min feedrate (mm/s), T=Min travel feedrate (mm/s), B=minimum segment time (ms), X=maximum XY jerk (mm/s),  Z=maximum Z jerk (mm/s),  E=maximum E jerk (mm/s)
Recv: echo:  M205 S0.00 T0.00 B20000 X4.00 Z0.40 E1.00
Recv: echo:Home offset (mm):
Recv: echo:  M206 X0.00 Y0.00 Z10.64
Recv: echo:PID settings:
Recv: echo:   M301 P25.89 I1.94 D86.53

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zemlin
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Location: Indianapolis, Indiana

Re: Nerfed acceleration on rev E?

Post by zemlin » Mon Mar 27, 2017 12:33 am

Here's what I run these days
M201 X2000 Y2000 E1000 Z900 ; acceleration
M205 X20 Z1.0 E10 ; jerk

abrasive
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Joined: Tue Mar 21, 2017 9:39 pm
Location: UT, US

Re: Nerfed acceleration on rev E?

Post by abrasive » Mon Mar 27, 2017 2:05 am

Thanks for that. Quite a bit of room to play between those settings and mine!

abrasive
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Location: UT, US

Re: Nerfed acceleration on rev E?

Post by abrasive » Mon Mar 27, 2017 4:16 pm

FYI, these are the new default firmware settings, per Makergear support. They've been changed to improve print quality.

I think it's interesting that they chose to accelerate the table harder than the extruder head. My guess would be that the table weighs a fair amount more. Perhaps not on a dual-extruder machine, though? (Mine's still single, for now.) I guess the Y axis belt is more rigid than the 0.2mm high bit of in-flight molten plastic. ;)

Thanks again,
Dave

airscapes
Posts: 192
Joined: Wed Jan 31, 2018 11:36 pm

Re: Nerfed acceleration on rev E?

Post by airscapes » Sat Jun 02, 2018 6:01 pm

zemlin wrote:
Mon Mar 27, 2017 12:33 am
Here's what I run these days
M201 X2000 Y2000 E1000 Z900 ; acceleration
M205 X20 Z1.0 E10 ; jerk
Are you still using these settings for your M2?

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zemlin
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Location: Indianapolis, Indiana

Re: Nerfed acceleration on rev E?

Post by zemlin » Mon Jun 04, 2018 6:45 pm

airscapes wrote:
Sat Jun 02, 2018 6:01 pm
zemlin wrote:
Mon Mar 27, 2017 12:33 am
Here's what I run these days
M201 X2000 Y2000 E1000 Z900 ; acceleration
M205 X20 Z1.0 E10 ; jerk
Are you still using these settings for your M2?
My M2 is no longer in service, so no.

airscapes
Posts: 192
Joined: Wed Jan 31, 2018 11:36 pm

Re: Nerfed acceleration on rev E?

Post by airscapes » Mon Jun 04, 2018 7:52 pm

Are these parameters good for an M2?

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zemlin
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Re: Nerfed acceleration on rev E?

Post by zemlin » Tue Jun 05, 2018 4:20 pm

airscapes wrote:
Mon Jun 04, 2018 7:52 pm
Are these parameters good for an M2?
Accelerations would be on the high side, probably, but there isn't a "best" with these settings. It's finding the compromise that works best for the parts and your personal priorities - speed/acceleration/jerk all work together to impact print quality.

airscapes
Posts: 192
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Re: Nerfed acceleration on rev E?

Post by airscapes » Tue Jun 05, 2018 9:55 pm

Thanks, I keep wanting to understand it but it is rather complicated.. I assume as I progress in knowledge and experience it will be possible to grasp it all.. I assume since I have only ever put changes in a start script of the slicer the info displayed with M503 is the default. One thing that would be helpful is a document or website that would explain what the numbers mean and more about each variable.
For instance.. what is meant by Maximum Accelerations, is that when the matter/anti-matter containment fields collapse?
I need a good white paper that explains the parameters in mechanical terms, what the cause and affects are of one to the other and the print etc..
I am currently using the above settings, what is the consequence in print finish of high accelerations?
Sorry.. just like to understand how thing work.. was an auto mechanic for 10 year, then a programmer, and have been a Unix System Admin for the past 18 years so kind of need the details.
If you can point me at something that is not too deep to start with I would be much appreciative.

\\
Send: M503
Recv: echo:Steps per unit:
Recv: echo: M92 X88.88 Y88.88 Z1007.70 E471.50
Recv: echo:Maximum feedrates (mm/s):
Recv: echo: M203 X200.00 Y200.00 Z25.00 E25.00
Recv: echo:Maximum Acceleration (mm/s2):
Recv: echo: M201 X900 Y1000 Z30 E1000
Recv: echo:Acceleration: S=acceleration, T=retract acceleration
Recv: echo: M204 S2000.00 T3000.00
Recv: echo:Advanced variables: S=Min feedrate (mm/s), T=Min travel feedrate (mm/s), B=minimum segment time (ms), X=maximum XY jerk (mm/s), Z=maximum Z jerk (mm/s), E=maximum E jerk (mm/s)
Recv: echo: M205 S0.00 T0.00 B20000 X4.00 Z0.40 E1.00

TGAW
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Location: Occoquan, Virginia
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Re: Nerfed acceleration on rev E?

Post by TGAW » Wed Jun 06, 2018 6:52 pm

airscapes wrote:
Tue Jun 05, 2018 9:55 pm
One thing that would be helpful is a document or website that would explain what the numbers mean and more about each variable.
Although this won't help with understanding the cause and effect of settings and the final print, I often refer to the G-code RepRap Wiki to learn about the numbers and their variables. You can find that at:

https://reprap.org/wiki/G-code

It does let you drill down to specific commands. For example if you wanted to learn more about M204 (setting the acceleration), there is a link directly to that section

https://reprap.org/wiki/G-code#M204:_Se ... celeration

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