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Round shapes with corners!

Posted by scooth 
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scooth
Round shapes with corners!
January 19, 2012 06:41PM
Hello Guys!

I dont knows whats happend with my prusa!
I print this piece:

Its perfect! All smooth round


But now the piece came with corners:


I check belts, bed, change pololu, speed, and not resolved!
Im using pronterface and Slic3r do generet Gcode, bouths printing same!
I verifiy the Firmware too, all correct!

I will change the board tomorrow, but i think this is not the problem!

Maybe the problem is step motor?

Thanks
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fks
Re: Round shapes with corners!
January 20, 2012 02:51AM
Looks like a belt problem to me. I would estimate spacing of your ripples 5mm ...
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nophead
Re: Round shapes with corners!
January 20, 2012 04:29AM
It looks like it pauses between line segments and leaves excess plastic at the joins . Have you changed anything to do with the USB comms speed or anything that would slow down the host?

[www.hydraraptor.blogspot.com]
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scooth
Re: Round shapes with corners!
January 20, 2012 11:12AM
Noting change!
Im using PC power supply. I will change today! Maybe the problem!
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Buback
Re: Round shapes with corners!
January 20, 2012 11:42AM
Well you did change one thing: the filament.

Whether it's the pigment or just that it's a different batch and has a slightly different chemical composition, different colors will print differently, so you have to calibrate for each color you want to print with. The green will probably require some changes to skeinforge dimension and maybe temperature too.

Also you didn't mention measuring the filament. Any time you change the filament you've got to remeasure the filament diameter.

Edited 1 time(s). Last edit at 01/20/2012 11:47AM by Buback.
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scooth
Re: Round shapes with corners!
January 20, 2012 04:11PM
Hello!

I change for d orange filament again!
Same problem!
The measuring of orange and green filament is around 2,8mm
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Mazaw
Re: Round shapes with corners!
January 21, 2012 01:38PM
Is the lubrication on the smooth rods sufficient or have you developed some dry sections? Are your pullies worn? I'm curious what it could be...

Did you regenerate the gcode since the first print, or are you using the identical generated file as before?
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scooth
Re: Round shapes with corners!
January 21, 2012 01:40PM
Hello!

I try with new Board all with new components, change the motors, change the PC, change filament, change power supply, and no solution!

I verifiy the BAUD, all the same!
Last try is change the USB/TTL Converter!
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scooth
Re: Round shapes with corners!
January 21, 2012 01:50PM
I change the USB/TTL Converter!
Problem Stays
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Andrew Diehl
Re: Round shapes with corners!
January 23, 2012 10:57AM
Your perimeter is printing too fast and the firmware is slowing the print down at the facets of the object to stay within the acceleration parameters.

If you are using sprinter/teacup keep the perimeter under 25mm/s, and if you are using marlin the XY jerk value just needs to be raised (or print slower)

www.Fablicator.com
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Greg Frost
Re: Round shapes with corners!
February 02, 2012 06:09AM
switch from sprinter to marlin. its interrupt driven steps and lookahead planning make curves much smoother.
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