how to avoid the material of overhang inner surface dropping

[erwin-zhang 0]

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

 

[ultiarjan 1,223]

Best solution is to avoid overhang by changing the orientation you print the object in. Rotate in cad or in cura.

Think this is a good option in your case. Otherwise you need to use support... but this will always be a less nice surface...

[gr5 2,271]

ultiArjan has good advice. There are several fixes but I like ultiArjans. Did you design this part? Consider:

1) Flip part over.

2) Instead use bridging.

Bridging is easier to print see photo here:

http://support.3dverkstan.se/article/23-a-visual-ultimaker-troubleshooting-guide#overhangs