M2 Accuracy -- What's reasonable to expect?

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jferguson
Posts: 163
Joined: Mon Mar 30, 2015 7:26 pm

Re: M2 Accuracy -- What's reasonable to expect?

Post by jferguson » Thu Jul 27, 2017 1:52 pm

BRATAG,
Could you share your gcode for cube print you posted? I'm having some problems getting quality cubes and rather than chew up space here with stupid questions, I thought I might get a better handle on it with "known-to-be-good" code.

I'm a bit mystified about this, but printers don't all seem to be the same in the dark. I bought a Turnigy TinyBoy 18 months ago which proceeded to pour out pretty good prints from the start - first one, a cube was close to perfect, but with some warping of bottom. I fixed this by adding a heated bed, but no fan.

problem when something more or less works form start is you don't learn anything.

I could learn a lot from gcode which makes good prints on someone else's M2. BTW, the samples which came with mine all print beautifully.

john

mathisyourfriend
Posts: 100
Joined: Sat Apr 19, 2014 8:34 pm

Re: M2 Accuracy -- What's reasonable to expect?

Post by mathisyourfriend » Thu Jul 27, 2017 2:01 pm

"it's more that the firmware won't care after a certain precision. i don't know what it is, but .1905 will be close enough"

That's what I figured. Thanks, I'll try it.

BBID
Posts: 36
Joined: Sun Jun 04, 2017 4:47 am

Re: M2 Accuracy -- What's reasonable to expect?

Post by BBID » Thu Jul 27, 2017 6:28 pm

it's more that the firmware won't care after a certain precision. i don't know what it is, but .1905 will be close enough
I'm still not seeing how (1007.70 steps/mm)(0.1905 mm) = 191.96 steps is an even number of steps that the printer can more easily process.

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insta
Posts: 2000
Joined: Tue Sep 16, 2014 3:59 am

Re: M2 Accuracy -- What's reasonable to expect?

Post by insta » Thu Jul 27, 2017 7:02 pm

Fine, then use 0.1905328966954451 as the layer height.
Custom 3D printing for you or your business -- quote [at] pingring.org

BBID
Posts: 36
Joined: Sun Jun 04, 2017 4:47 am

Re: M2 Accuracy -- What's reasonable to expect?

Post by BBID » Thu Jul 27, 2017 7:07 pm

Fine, then use 0.1905328966954451 as the layer height.
I get your point, but how is 191.96 steps @ 0.1905 mm layer height easier to process than 201.54 steps @ 0.200 layer height?

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insta
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Re: M2 Accuracy -- What's reasonable to expect?

Post by insta » Thu Jul 27, 2017 8:31 pm

The hope is you get it close enough that the firmware just rounds it to 192 steps. I guess I was too aggressive with my rounding?
Custom 3D printing for you or your business -- quote [at] pingring.org

BBID
Posts: 36
Joined: Sun Jun 04, 2017 4:47 am

Re: M2 Accuracy -- What's reasonable to expect?

Post by BBID » Thu Jul 27, 2017 8:46 pm

The hope is you get it close enough that the firmware just rounds it to 192 steps.
Oh ok. I get it.

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zemlin
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Location: Indianapolis, Indiana

Re: M2 Accuracy -- What's reasonable to expect?

Post by zemlin » Fri Jul 28, 2017 1:38 pm

I printed some parts in ABS yesterday with a .165 layer height.
I did not get any banding on the magnitude you're seeing. If I light it VERY shallow with a point light source (LED), I can pick up a very slight irregularities. I don't feel like the banding you are seeing is characteristic of the M2. It's not a perfect surface, but it doesn't have a pattern.

Here's what the part looks like under normal light.
m2-side.jpg
and if I light it to make it as ugly as possible
m2-low.jpg

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