Printing Convex Overhangs

[RobH2]

Ok, I'll try this later once my long print I'm doing now finishes. This is a fun test. Thanks for staring it.

[RobH2]

Those look incredible! For me, warping continues almost up to the halfway mark. I think its time to duct my cooling fan to direct the air closer to the nozzle. That's a part of my printer that hasn't gotten much attention yet.

Yea, keep at it. I've been tweaking and calibrating for over 4 months. What printer do you have?

[RobH2]

Here's one last sample and then I need to work for awhile. This is the snout of a T-Rex I printed to do just what we are talking about here. I wanted to test overhangs and this model has a lot, at different angles and dimensions. I was pleased with it. This model is about 1.5" tall. I was really impresses with the skin texture I was able to capture.

rex.jpg

Edit: Oh yea, printed "without" any support.

[paradiddle65]

Yea, keep at it. I've been tweaking and calibrating for over 4 months. What printer do you have?

I currently have a ROBO3D, a printer derived from repraps. I'm in the process of designing a 3D printer of my own, which is why I've mainly been interacting on this reprap subforum

[Roxy]

Here's one last sample and then I need to work for awhile. This is the snout of a T-Rex I printed to do just what we are talking about here. I wanted to test overhangs and this model has a lot, at different angles and dimensions. I was pleased with it. This model is about 1.5" tall. I was really impresses with the skin texture I was able to capture.

rex.jpg

Edit: Oh yea, printed "without" any support.

That is impressive. Is that ABS at 230 degrees? I like to print hot but when I'm doing something questionable like those teeth on the T-Rex I back the heat down as far as I can.

[RobH2]

I currently have a ROBO3D, a printer derived from repraps. I'm in the process of designing a 3D printer of my own, which is why I've mainly been interacting on this reprap subforum

I look forward to seeing the printer when you are finished.

[paradiddle65]

Over the last week or so I printed and installed a shroud for the cooling fan on my extruder. Its blowing directly on the freshly extruded material, and that made all the difference in the world! There really was an incredible change in print quality when looking at curved overhangs. My overhang capability when from about 45 deg to almost 20 deg. I'm amazed at how much focusing the cooling air affected the part quality.

IMG_20140724_081406_440.jpgIMG_20140724_081346_177.jpg

This part was printed in the orientation shown; two axis parallel to the print bed and one normal. I did use support but mainly for bed adhesion reasons. All in all, very pleased

[RobH2]

Nice. Really looking good. Where are you in Maryland 'paradiddle65'? I'm in Baltimore.

[paradiddle65]

Used to live in Germantown but recently moved to Tysons Corner, Va. Should probably update my profile

[RobH2]

Used to live in Germantown but recently moved to Tysons Corner, Va. Should probably update my profile

No problem. Just curious. If you were in Baltimore I was going to suggest we met for a beer in Fells Point for lunch or something and talk printers.

I just recently met a guy from Germantown who I'm doing some 3D work for. Small world eh?

See ya