Re: shrinking rate
- Thank´s Marco i´ve measure the part and wall thickness is the same on both parts(normal and scaled part)it makes sense the more volume the more it will shrink. I think it won´t matter if I´m printing a box like with thin walls (scaling the part by the shrink rate) but it will make a big diference if i´ve a part that has both very thick wall and very thin wall on it.
I did print a part that was like that and it got smaller on thick walls then on thin walls thus deforming the part by a considerable amount.
i think the best thing is to keep all the walls the same thickness using a shell on the cad.
--- In email@example.com, Bedo <bedo@...> wrote:
> At 04.51 16/02/2013, you wrote:
> >I think that if the resin has a linear shrinking
> >rate then the hole shoud get bigger as the
> >outside of square would get smaller by the same amount in percentage.
> >i remember working with some bondo resin in the
> >past and had the same problem and never found a
> >good explanation on resin shrinking on this kind of odd shrinking.
> >i don´t think light bleeading can be account for
> >it. if that was the case the square would always get bigger not smaller.
> hello all,
> I'm reading this group since a long time but posted just a few,
> so I jump in this discussion. As far as I know from my work, shrinkage
> goes with material volume, not on overall
> dimension, it works kind of both ways. If you
> have a closed volume it will shrink of a % overall,
> but if you have a hole in it, it will shrink both
> in overall dimensions and "wall" thickness. So
> the correct solution maybe a combination
> of resizing and offset. Attached an image to
> explain shrinkage directions. Also take in
> account that thicker walls lead to bigger shrinkage
> so the outside square also gets distorted by a
> little bit if not supported by previous layers...