SoliForum - 3D Printing Community — Problem with layers curling upwards

Re: Problem with layers curling upwards

2013-01-27T15:40:19Z

ronsii wrote:

Cooling fan is going to be your best bet On sharp overhangs I tend to stay right by the printer when it comes to an area like that and keep a little stick or something flat handy to depress the curls down as it prints... but you gotta be quick! The main problem is ABS will naturally curl just because of the shrinkage and movable/nonmovable ratio (for lack of a better term) just like taking two pieces of paper and laying them onto one another and glue one end together... now stretch the top one (free end) to simulate cooling of the top layer... this will in turn pull up the lower layer... well you get the idea, anyways there a couple of other reasons for the curl and all together they just aren't friendly to overhangs .

Again this is why higher temperatures / heated build chamber help a great deal.

Re: Problem with layers curling upwards

2013-01-26T07:49:52Z

Cooling fan is going to be your best bet On sharp overhangs I tend to stay right by the printer when it comes to an area like that and keep a little stick or something flat handy to depress the curls down as it prints... but you gotta be quick! The main problem is ABS will naturally curl just because of the shrinkage and movable/nonmovable ratio (for lack of a better term) just like taking two pieces of paper and laying them onto one another and glue one end together... now stretch the top one (free end) to simulate cooling of the top layer... this will in turn pull up the lower layer... well you get the idea, anyways there a couple of other reasons for the curl and all together they just aren't friendly to overhangs .

Re: Problem with layers curling upwards

2013-01-26T01:22:58Z

My problem was not warping from the bed, it's curling from overhangs that's killing my .1mm prints. at .3mm they look fine but I try at .1mm and they bend upward and usually the part gets knocked aside. At .1mm and straight up they look fantastic, if I try to employ a 45 degree outcropping, they fail.

I use glass and hairspray and haven't had a problem with warping, but now the bottom of the print is pretty shiney and not uniform with the rest of the print color. I want a dull finish so I don't clean it with acetone.

Re: Problem with layers curling upwards

2013-01-25T18:10:53Z

I suggest letting the bed heat up more. so ther is no cold spots on it. This problem usually occurs when the bed in not above 90*C around the center of bed. You can also bump up the temp from 90 to 100.

Re: Problem with layers curling upwards

2013-01-25T15:27:14Z

I have a problem with Repetier/Slic3r and uplift at .1mm on overhangs curling. I'm going to try a cooling fan and duct to see if that helps. I reduced my flow rate by 7% for the .1mm layer height and that just made the regular layers too thin and still curled on the overhangs. The slowdown from the cooling mode just left the hot nozzle over my print longer. I am also going to try printing multiple parts in the same run so the head will move at normal speed.

That is interesting that you did not have this problem before the switch. I wonder what is different.

Problem with layers curling upwards

2013-01-25T10:04:00Z

Hello,

I recently switched to Repetier Host + Slic3r from Pronterface + Skeinforge. I now have this problem that the printed layers start to curl up and the extruder ends up pushing through the previous layers when printing. Any ideas how to fix this? I did not have this problem on Pronter +Skein.

Not sure but this problem might only happen when there is a slight overhang. I'm successfully printing in 0.1mm layers that have no overhang.