exxos blog - random goings on

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exxos
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Re: exxos blog - random goings on

Post by exxos »

Been following this guide for XY calibration https://www.instructables.com/Calibrati ... -filament/

Currently just printing 10mm cubes..

I looked at the original offsets for I started messing about...

Code: Select all

SENT: M92
READ: echo: M92 X88.91 Y88.91 Z400.00 E100.00
I have taken out the X compensation from my print file as well. So now I am truly back to default.

A bit of numbercrunching later...

Code: Select all

New M92 value = Desired movement / Actual movement * Current M92 value

X
10 / 10.22 * 88.91 = 86.99608610567515

Y
10 / 10.17 * 88.91 = 87.42379547689282

M92 X86.99 Y87.42
M500

Y new
10 / 9.97 * 87.42 = 87.68304914744233

X new
10 / 10.13 * 86.99 = 84.45631067961165

M92 X84.456 Y87.683
M500
Definitely getting closer to what it is supposed to be. Once I have XY sorted. Will try and figure out Z.. Then will print a double -sized cube to see if it is scaling up properly...

:dizzy:
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Re: exxos blog - random goings on

Post by exxos »

XY are pretty close spot on now. E & Z seem fine as they are, but the print still ends up at 10.27mm high :shrug: will play with the first layer heights see if I can get that down a bit..
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Re: exxos blog - random goings on

Post by Badwolf »

exxos wrote: Fri Aug 13, 2021 9:55 pm XY are pretty close spot on now. E & Z seem fine as they are, but the print still ends up at 10.27mm high :shrug: will play with the first layer heights see if I can get that down a bit..
Bear in mind you might have a natural (fixed) overshoot in all axes -- you will still probably need to apply a tolerance factor to the original model when printing. Mine is 0.4mm in X and Y, for example. That's fixed whether I print 10x10x10mm or 150x150x10mm.

10mm is a very small calibration baseline, BTW. A hollow rectangle 150x150x0.4mm only takes seconds to print, but will give better X/Y resolution. Z always harder, but often less important.

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Re: exxos blog - random goings on

Post by exxos »

8-)

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Re: exxos blog - random goings on

Post by exxos »

Started printing a 1mm high 80x80mm block. Annoyingly the gaps are still present after calibrating everything up :cussing:

So I have no idea what is going on :cry:

IMG_6760.JPG
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Re: exxos blog - random goings on

Post by PhilC »

@exxos that does look much better and now looks like you need to re-calibrate the extruder as its now under extruding nice and evenly.
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Re: exxos blog - random goings on

Post by exxos »

PhilC wrote: Mon Aug 16, 2021 12:44 pm @exxos that does look much better and now looks like you need to re-calibrate the extruder as its now under extruding nice and evenly.
Already done it. Done the whole measure how much goes though vs sending 100mm extrusion. Its all spot on. It wasn't that far out to start with. Actually it was everso over-extruding before.
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Re: exxos blog - random goings on

Post by PhilC »

@exxos humour me with this if you will. I did the same and it didn't work for me, so I messed with the extruder settings by hand, mines set something like 0.89 even though the test came up 100mm correctly.
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Re: exxos blog - random goings on

Post by exxos »

PhilC wrote: Mon Aug 16, 2021 1:02 pm @exxos humour me with this if you will. I did the same and it didn't work for me, so I messed with the extruder settings by hand, mines set something like 0.89 even though the test came up 100mm correctly.
I've set the flow rate to 1.20, so 20% more and it looks no different. I'm going to check the height again when its printed the next square.
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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Re: exxos blog - random goings on

Post by PhilC »

@exxos using the Marlin software on my printer 1.2 would mean that it was over extruding by 20 and you've had to reduce it, so divide number of steps by 1.2, whereas 0.89 means uou need it to extrude by another 11% or something like that.
If it ain't broke, test it to Destruction.
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