Prints pulling up at corners

[naturalstate720]

Here is a building we printed a while back that has really bad warping. It's around 5" at it's longest dimension. This is before we figured out how to add supports.

[jimc]

yup, as i thought, you gap is way too large. take a round pen from your desk drawer and put it flat on the desk. where is it touching the desk? just a micro small edge down the center of the pen right? well the extruder puts out round extrusions. if your bed gap is too loose those round extrusions are barely making contact. if you tighten that gap up a bit until the edge of each extrusion touches then your extrusions are more square shaped and its going to give you 100% contact of the bed surface which is what your looking for. think of the extruder like its a mini caulking gun. it will operate the same way. squirt out caulk 1" above the surface and just let the bead lay there or squirt out caulk 1/8" above the surface.....

[Jules]

Lowered print speeds to 4200. Set temp to 60. Nozzle to 205. Also lowered speed to 30% on support, because it seems like supports sometimes get knocked over when going fast.

And I already see the corner pulling up, but it's slight. And this is a model that has fairly small footprint, about the size of a pack of playing cards.

What can I do next? Taking a pic now of previous print on bottom.

If you've done all of these things, i tend to suspect that jim pegged it and your gap might be a little too far away. A close-up of the print will show it. (You can stop the print the instant you see it start to pull up....don't waste filament. It's toast once it warps.)

You can further lower your print speeds as a percent of the total speed on the Other tab. (Infill at 80%, Outlines at 80%, etc.) and first layer at something like 60%. But you might also need to move the bed just a little bit closer to the nozzle for that first layer by using the Z-Offset.

Did you go through the How To: Guide to Getting Started at the front of the Forum? I put some good starter settings for PLA in there, and it discusses setting the gap correctly.

[naturalstate720]

Hmm, so is that the same as z offset? I put a feeler gauge at .006 and it has resistance. Is this what you're referring to? The nozzle seems very close to the glass already.

[naturalstate720]

What about layer height and extrusion width? I changed the extrusion multiplier to .92 based on average measurement from caliper measurement squares.

[jimc]

this is what your bottom layer should look like. see how its flat and smooth with the extrusions touching? i have 100% bed contact on this print.

[jimc]

to set your bed gap, in s3d be sure your first layer height and width is set to zero. also be sure your gcode offsets are all at zero. start with a .005" feeler gauge and adjust the z-stop bolt with the extruder at bed center so that you have a light drag. do a test print and on the first layer see if the extrusion edges are touching. do the extrusions look round? they should look ever so slightly flattened. if the are round then you need to go tighter. if the extrusion is too fat and really wide then you need to increase the gap.

[jimc]

here is something i design up some years back that might help you out


http://www.thingiverse.com/thing:180970

[naturalstate720]

My print height is 90%
print width is 100%

And my global gcode offset are all 0 except for Z which is -10. SO that should be zero too?

So those should be zero?

Thanks so much for the help!

[naturalstate720]

Hmm it won't let me make those 0. It appears the lowest they can go is 1. Am I looking at the right place?