Support Overhang Angle

[curasurf 4]

I studied the recommended Cura profile of Ultimaer S3 / PLA 0.4 nozzle / Draft Fast 0.2mm:

                       Layer height: 0.2 mm

      Outer Wall Line Width: 0.4 mm

Support Overhang Angle: 60°

 

To my supprise, Support Overhang Angle is NOT a calculated value!

 

My printer is Creality CR-10sp. In all its profiles Support Overhang Angle is calculated from a formula. My experiments also show that the formula is a sound choice. According to this formula, the Support Overhang Angle for the Ultimaer S3 profile should be calculated as:

 

• Support Overhang Angle = atan(0.4×50% ÷ 0.2) ÷ 3.14159 × 180 = 45°

 

So the recommended angle 60° for Ultimaer S3 would surely lead to failure. Hope to know what you think about this. Thank you!

 

Edited February 25, 2021 by curasurf

[nallath 1,123]

As far as I know a 60deg overhang is perfectly printable on an S3.

The formulas for non Ultimaker printers are not created by us. It's up to the contributors in question to set them.

[curasurf 4]

30 minutes ago, nallath said:

As far as I know a 60deg overhang is perfectly printable on an S3.

 

@nallath   According to the recommended profile Ultimaker S3 / PLA 0.4 nozzle / Draft Fast 0.2mm, the picture would be:

 

Layer height = 0.2 mm

Line width = 0.4 mm

Overhang angle = 60°

 

Do you think it's ok?

Edited February 24, 2021 by curasurf

[nallath 1,123]

Our material engineers do seem to think so 🙂

[curasurf 4]

4 minutes ago, nallath said:

Our material engineers do seem to think so 🙂

 

That's really a bold profile. Let me try it. Thank you!

[curasurf 4]

It seems to be magic for some Ultimaker profiles. I know that disabling "Outer Before Inner Walls" would give some help, but it's really magic.

 

Ultimaker S3 / PLA 0.4 nozzle / Draft Fast 0.2 mm
          • Layer Height = 0.2 mm
          • Outer Wall Line Width = 0.4 mm
          • Overhang angle = 60°

                    

 

Ultimaker S3 / PLA 0.4 nozzle / Default Fast 0.2 mm
          • Layer Height = 0.2 mm
          • Outer Wall Line Width = 0.35 mm
          • Overhang angle = 60°

                    

 

Ultimaker S3 / PLA 0.8 nozzle / Default Extra Fast 0.3 mm
          • Layer Height = 0.3 mm
          • Outer Wall Line Width = 0.75 mm
          • Overhang angle = 70°

                    

 

Ultimaker S3 / PLA 0.8 nozzle / Default Sprint 0.4 mm
          • Layer Height = 0.4 mm
          • Outer Wall Line Width = 0.75 mm
          • Overhang angle = 70°

                    

Edited February 25, 2021 by curasurf

[curasurf 4]

On 2/25/2021 at 12:18 PM, curasurf said:

Ultimaker S3 / PLA 0.8 nozzle / Default Sprint 0.4 mm
          • Layer Height = 0.4 mm
          • Outer Wall Line Width = 0.75 mm
          • Overhang angle = 70°

                    

 

I wonder whether somebody tried this profile with S3 printer. It's unbelievable.

[GregValiant 1,320]

Looking at your sketches the max should be about 63°.  This is 60° then 70° on the Ender3P.  The 60° looked spot on.  The 70° had consistent sagging of .5 to .8mm once it got away from the transition point.  My fan works quite well.

 

[curasurf 4]

Hi @GregValiant   Thank you for your experiment and comment! You are always helpful!