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Issues again with my Mendel90

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Anonymous User
Issues again with my Mendel90
April 22, 2013 08:47AM
hi,

i have new Problems with my Mendel90 printer.
i made no changes .. it just apeared.

take look:
[i.imgur.com]
[i.imgur.com]

i triyed changing diameter and temperature and no changes.
no matter wich layerhigh0 how fast, always same problems every few layers.

i hope somebody can help.

greetings
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nophead
Re: Issues again with my Mendel90
April 22, 2013 10:01AM
Looks like something wrong with the Z axis. The bands look to be once per rev of the lead screw and get worse as the part gets taller.

Is the object the correct height or a bit short? Perhaps Z is missing steps once per rev. Do the pointers stay in step?

[www.hydraraptor.blogspot.com]
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Anonymous User
Re: Issues again with my Mendel90
April 22, 2013 10:24AM
the object is 0.04mm to short. i think this its ok. 

Perhaps Z is missing steps once per rev

what i can do to fix that.

here a small video of the rods while turning, hopefully helps
[www.vidup.de]
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nophead
Re: Issues again with my Mendel90
April 22, 2013 11:32AM
Perhaps put oil on the leadscrews, reduce the speed or the acceleration.

Are you using the same firmware settings as provided? I.e. same Z speed and acceleration and not disabled when not moving.

[www.hydraraptor.blogspot.com]
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Anonymous User
Re: Issues again with my Mendel90
April 23, 2013 12:17AM
Hello nophead,

i use now the original config.h from you. Just changed e-step and Home_Z and still have same issues.
i tryed another calibratio n part, and again waves in the corners.
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Anonymous User
Re: Issues again with my Mendel90
April 23, 2013 03:42PM
i tryed to print without headbed and this issue is almost gone.
Is there a way to get a more constant heatflow with mendel90 ?

regards
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nophead
Re: Issues again with my Mendel90
April 23, 2013 05:23PM
Not sure what you mean. Are you saying the bed is flexing causing the horizontal banding? Seems odd it as looks to be every 1.25mm.

[www.hydraraptor.blogspot.com]
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Anonymous User
Re: Issues again with my Mendel90
April 26, 2013 01:57PM
i played all over my printer. the effect is little less now, dont know why.

my next problem is skipping stepps.
i have now a aluminiumplate on the m2 heater (4mm) + a thin printsheet and woll under the heatplate for more isolation.
I believe my bed is to heavy now sad smiley.

is it possible and what can i do ?

regards

Edited 1 time(s). Last edit at 04/26/2013 01:59PM by Repper.
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nophead
Re: Issues again with my Mendel90
April 27, 2013 09:50AM
Reduce the acceleration in the firmware. Try 2000 or maybe 1000.

[www.hydraraptor.blogspot.com]
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Anonymous User
Re: Issues again with my Mendel90
April 27, 2013 09:47PM
i reduced acceleration to 1000.
perimeter 30
infill and spare 50

still skipping steps .

no luck sad smiley
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nophead
Re: Issues again with my Mendel90
April 28, 2013 04:04AM
How heavy is the bed?

f = ma so if m is say three times bigger use 2000 / 3.

Check the bed is moving freely when the belt is removed. Perhaps it is binding for some reason.

[www.hydraraptor.blogspot.com]
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