Z dimensions tolerance on overhanging surfaces
Hi to everyone,
I have i question for you If you can help me to understand an issue that I have, for example when I print this object below.
On the side where you see the two holes I have an overhanging surface, therefore I have use supports ss you can see in the second picture.
I tried few settings to obtain a better surface under the overhanging surface. After printed I remove the supports and I obtain a good printed object.
My issue is that the distance between the two surfaces are lower of 0.5mm of the dimension that should be. The overall dimensions of the object are perfect and also the lower part (where is the lower hole) is perfect. The upper overhanging part instead is more thicker of 0.5mm.
I tried to adjust the problem by the modifying the drawing, but I still have the problem.
Do you maybe know what could I do to prevent this problem coming out?
Thank you
Best Answer by JoanTabb:
I suspect this is due to the gap between the supports and the lower face of the supported area, the lower face tends to sag towards the support and doesn't squish as it normally would if it were building upon normal lower layers, the net result is that the top part becomes thicker,
Could you make the top part thinner be the 0.5mm on the bottom face to allow for the droop. or use soluble supports, or use 'Scaffold' break away supports with a zero mm gap?
regards Joan
RE: Z dimensions tolerance on overhanging surfaces
I suspect this is due to the gap between the supports and the lower face of the supported area, the lower face tends to sag towards the support and doesn't squish as it normally would if it were building upon normal lower layers, the net result is that the top part becomes thicker,
Could you make the top part thinner be the 0.5mm on the bottom face to allow for the droop. or use soluble supports, or use 'Scaffold' break away supports with a zero mm gap?
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
RE: Z dimensions tolerance on overhanging surfaces
@joantabb
Thank you very much Joan, I did it. Sorry for my late reply 🙂
Do you thing with the MMU, printing PETG or NYLON, is possible to print the support with a soluble filament and will I obtain a good result?
Thank you
Have a great weekend.
Daniele
RE: Z dimensions tolerance on overhanging surfaces
Without seeing the whole part, cant you place the furthest end away from the view in the picture, flat on the print bed and print it that way, looking at the shape there doesn't look to be anything over 60 Deg overhang so it should print just fine.
Normal people believe that if it ain’t broke, don’t fix it. Engineers believe that if it ain’t broke, it doesn’t have enough features yet.
RE: Z dimensions tolerance on overhanging surfaces
@chocki
Here another view of the object (the green one), you mean I could print the object in this way? (the grey one)
Thank you
RE: Z dimensions tolerance on overhanging surfaces
Grey is how I'd print it.
RE: Z dimensions tolerance on overhanging surfaces
@tim-m30
Thank you!