1 Topic by trendicoff

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Topic: Mini w+ Printing ovals instead of circles

I realize that most posts here are for 1.0 or Jr models but I'm hoping someone can help a newcomer out with an issue with my mini.

I've seen other posts on here and other forums but I'm not sure if my issue is quite the same.  My printer seems to do fine printing circles larger than 1" diameter, but smaller than that and they seem to always come out as ovals.  Obviously this makes printing any small parts/details a challenge.  I tried to go ahead and increase the tension on my x and y axis belts but they seemed pretty darn tight to me already and it didn't seem to make any change.  Is there a software setting or something that I may need to address?

Any advice would be much appreciated.  Here is a photo sample of the issue http://soliforum.com/i/?RWIyJBG.jpg.

2 Reply by carl_m1968

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Re: Mini w+ Printing ovals instead of circles

You need better cooling of the part. Or you need to print several parts so the previous layer can cool slightly before the next layer is added. You part is staying too soft when the next layer is added it is deforming it.

Printing since 2009 and still love it!
Anycubic 4MAX best $225 ever invested.
Voxelabs Proxima SLA. 6 inch 2k Mono LCD.
Anycubic Predator, massive Delta machine. 450 x 370 print envelope.

3 Reply by trendicoff

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Re: Mini w+ Printing ovals instead of circles

Thanks Carl for the idea.  I was really hoping it could be something that simple but it doesn't look like that's the issue.  I set up 2 fans to blow on the plate as it printed and had it print 2 at the same time to give it a chance to cool in between layers.  To my eye it looks pretty much the same.  The 2 on top of each other were printed simultaneously and the one on the right was the previously printed one.  Any other ideas?

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4 Reply by Kronikabuse

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Re: Mini w+ Printing ovals instead of circles

You need directed airflow at the printing point just below the nozzle

Sd4 #9080 with a glass bed. E3d chimera duel extruder. Paste extruder , duet wifi.
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5 Reply by trendicoff

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Re: Mini w+ Printing ovals instead of circles

I can give it a shot but it was pretty heavy airflow all over the plate area.  Any stronger and it started to actually move the filament that was coming down.

6 Reply by Teddyz

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Re: Mini w+ Printing ovals instead of circles

I have the same/similar problem when printing even larger circles.

http://soliforum.com/i/?liTLJ6I.jpg

This was printed from https://www.thingiverse.com/thing:3927016

I use a Mini W printer where I have a 50 deg C heated bed.
The slicing seems to be round. To me it looks like the filament is too short so it takes a "shortcut". What can I do to prevent this?

7 Reply by carl_m1968

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Re: Mini w+ Printing ovals instead of circles

Slow down and raise your temp.

Printing since 2009 and still love it!
Anycubic 4MAX best $225 ever invested.
Voxelabs Proxima SLA. 6 inch 2k Mono LCD.
Anycubic Predator, massive Delta machine. 450 x 370 print envelope.

8 Reply by Teddyz

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Re: Mini w+ Printing ovals instead of circles

http://soliforum.com/i/?1E1Wuwp.jpg

Made a new test where I ran at slow speed (left) Made it slightly better.

Made another test (no picture) running at 10% of slow speed. Was worse because of more warping.

Last test (right) after I removed the build plate and tightened the belt and and also showed the bearings some love. Also changed the surface from plastic packing tape to blue carpenters masking tape. I prefer the shiny surface, but the packing tape is not easy to remove.

Anyway, the circle became much better. Smallest diameter is now 22.6mm and largest is 23.2mm, so it is still not perfect. Perhaps not possible with this machine?

( I probably should have run auto-level but I just forgot that )

9 Reply by carl_m1968

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Re: Mini w+ Printing ovals instead of circles

Teddyz wrote:

http://soliforum.com/i/?1E1Wuwp.jpg

Made a new test where I ran at slow speed (left) Made it slightly better.

Made another test (no picture) running at 10% of slow speed. Was worse because of more warping.

Last test (right) after I removed the build plate and tightened the belt and and also showed the bearings some love. Also changed the surface from plastic packing tape to blue carpenters masking tape. I prefer the shiny surface, but the packing tape is not easy to remove.

Anyway, the circle became much better. Smallest diameter is now 22.6mm and largest is 23.2mm, so it is still not perfect. Perhaps not possible with this machine?

( I probably should have run auto-level but I just forgot that )

Could also be the fact the steps per mom for each motor needs to be calibrated. I'll bet if you print a 20mm calibration cube you will see about the same variation.

Printing since 2009 and still love it!
Anycubic 4MAX best $225 ever invested.
Voxelabs Proxima SLA. 6 inch 2k Mono LCD.
Anycubic Predator, massive Delta machine. 450 x 370 print envelope.