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edges of large holes are getting randomly rounded.

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Posted · edges of large holes are getting randomly rounded.

I am printing with PLA using PVA support material.


Internal edges of big openings are not printing nicely but are rounded. 





Is this an adhesion issue?  Something else?


Thanks very much,

Jake Kittell

Research Engineer

University of Vermont

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    Posted · edges of large holes are getting randomly rounded.

    It looks like it is happening only on the bottom layer?  Correct?

    1) check the glass carefully - feel for holes in the glass.  Sometimes when removing a print, the glass spalls and a chunk of glass ends up in the print.  These problems may be occuring over those "holes" in the glass.


    2) It looks like it's not touching the glass in those spots.  It looks like possibly some mild underextrusion or maybe you just need to add some sort of glue.


    Glue stick works pretty well.  Best results are with an extra thin layer - apply glue stick then using a wet tissue spread the glue around evenly (and removing most of it).


    Or you can mix wood glue with water.  Use 10 to 20 parts water for 1 part elmer's (or other brand) wood glue.  Mix it well and paint it on the bed with a cheap paint brush.  Heat the bed to normal printing temps (60C for PLA) until the glue dries (takes usually about 4 minutes).


    Or buy Magigoo.  (google it)


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    Posted · edges of large holes are getting randomly rounded.

    To me it looks like warping too, due to poor bed-adhesion in those areas.


    Make sure there is no dirt and no oil/grease on the glass, and no soap. Clean with whatever you want, glass cleaner, alcohol,... Then clean again, only with isopropanol alcohol. Then with warm tap water only, absolutely no soap (=reduces bonding), no additives. Especially if you print on bare glass without bonding.


    Then use any bonding method you prefer, if any.


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