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Post stretch script


HSA76
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Posted · Post stretch script

Hi Everybody!

 

My problem is that my UM3 makes hole Ø0.4mm too small and my outside parts 0,2mm too big, and it doesn't matter if the part size is big or small, I wish that holes always is a little bigger and outer dimension always smaller, i found the script "Post stretch script" witch i thougth would do the job, but i can't find out how it works. If i increase parameter Wide circle stretch distance holes will be biggerbut also outer dimensions, and if i change the parameter Push wall stretch distance nothing happens.

 

I been testing a lot of cubes with a hole, 20x20x20mm with a Ø10mm hole.

 

Can anyone describe for me what exacly the two parameters really do?

if anyone has a solution for this that don't include remodelling I would be really happy to hear about it. (I usually get models from clients that are modelled with many surfaces and it is really hard to modify them so two parts will fit to each others..)

 

 

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    Posted · Post stretch script

    Thanks!

     

    I have now make some more testing, with partly great result, for nylon i'm tweaked Horisontal expansion seting and got partly better result, and togheter with post stretch script i could get part outer dim to 19,97mm and inner dim to Ø10,12, that is great. 

     

    Know im trying to get rid of the "mouse ears" that shows on outer corners. ?

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    Posted · Post stretch script

    The "fat corner" issue is better fixed by increasing jerk and acceleration (if your printer can do that without losing steps) and also by lowering the speed by a lot.  Try cutting speed in half.

     

    The UM3 can indeed take much higher acceleration than the defaults but you will get a new problem called "ringing" but if you care about tolerances more than looks, then ringing shouldn't bother you at all as those are basically not measurable with a micrometer but are quite visible to the eye if you shine the light just right (not hard to do at all).

     

    In fact you could just uncheck "acceleration control" and "jerk control" and those corners should get really nice.  Or cut the print speed in half.

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