[how to avoid the material of overhang inner surface dropping]

When I print overhangs of an object, no matter large or small, the inner surface of the overhang part is always ugly, my guess is the material is slowly dropping because there is no support.

How to avoid this and print a beautiful inner surface for overhang?

problem pictures:

http://pan.baidu.com/s/1kTqnS1p

 

[Vertical Line problem appear (UM original kit)]

Quite a lot to digest. Thank you all. I am going to tighten my belt as @gr5 suggested,

and try Slic3r setting from @yellowshark (hopefully I can find a faster computer) and experiment different settings as @3Dmaker4U analyze. And will see what happens.

 

[Vertical Line problem appear (UM original kit)]

update from printing: Picture below. Same problem with different settings(30mm/s & 20 mm/s print time). Now I have no clue...any setting need to be adjust?

http://pan.baidu.com/s/1c0GkrpI

I have tried 2 different speeds for one print object, but one is bigger size. Here is the setting:

Date 2014/9/27 2014/9/28

Name Bigger One Smaller One

Layer height 0.1 0.1

Shell thickness 3.6 3.6

Fill Density 20 20

Print Speed 30 20

Temperature 190 190

Retraction 60 60

Scale 0.7/0.7/0.7 0.5/0.5/0.5

size 60.51/60.51/131.11 43.22/93.65/43.22

print time 11h 6h40

weight 61 22

Travel Speed 50 50

bottom layer speed 0 20

Infill speed 0 20

outer Shell speed 30 20

Inner shell speed 0 20

 

[Vertical Line problem appear (UM original kit)]

There is a big vertical line appear on cylinder object while printing the object vertically.

Is anyone might know what could caused the problem and how to fix? Much appreciated.

P.S. I wanted to post picture, but it told me that "You are not allowed to use that image extension on this community.", as such, I post link below:

http://pan.baidu.com/s/1i3EDV3f

http://pan.baidu.com/s/1fate2

http://pan.baidu.com/s/1nt7eibJ

Many Thanks.