Tips for placing supports on large parts?

[Sam Ferguson]

Hello all, I am attempting to print a simple, but large container.  I started the print last night and came back to the failed print shown in the pics.  I used no supports because I assumed they were unnecessary for a simple part.  I have a GRM heated bed at 110C but I still get this pulling at the corners.  I used KISSlicer to do the tool path part file.  In addition the material is ABS (has to be because of water solubility issues).  Any pointers about how to print this part with supports for keeping it from coming up off the bed?

Thanks,

Sam

[Peter Gregory]

Looks to me like you need a brim around the bottom of the part.

If you add a single layer 1/10th to 2/10th inch wide connecting ring around the base of the part it will grip better and not lift up.

You can easily trim the brim away after the part completes.

[Sam Ferguson]

Okay, I'll give that a shot.  The "raft" support in KISSlicer should do the trick.

[Giovanni]

You can also try to enclose the printer to keep the heat inside and also try to print with PETT, it's ok with water and has less warping than ABS.

[Sam Ferguson]

Okay getting closer, I enclosed the printer as much as possible (the GRM heatbed comes out the right side). Re-printed, not quite as bad as before but still some layer separations.  Never have printed with PETT, I'll look into that I just haven't seen that material as much as ABS or PLA. I think I'm going to have to fill in the space between the walls a little more and see if that helps.  Doesn't help that this is a 30-hour print and there is plenty of time to cool down and warp.

-Sam

[Giovanni]

Measure the temperature into the printing chamber ( if you have a duo or trio you can read the temperature on a non working extruder ), you should have more than 60°C, ( 80°C would be perfect for ABS but I don't know if the Cubex can work with that temperature ).

If you can place more reinforcements near the corners certainly it would help. 

If you want to try PETT, here are my settings for PETT T-Glase Taulman to print with 0.1 layer thickness.

[Peter Gregory]

I think there is a little more going on than just the ABS shrinking.

The layer separation is suspicious.

What temperature are you printing the additional layers at?

Are you printing fast or slow?

The layers don't seem to be melting together well.

I print mainly in PLA. I've seen separation like that when either the flow is too low or the temperature is too low.

I may be off, but are you printing at a low temperature for ABS?

[Sam Ferguson]

I did in fact reduce the temperature on the ABS settings from 265 to 260 for the main layer and from 270 to 265 for the first layer.  I thought that 265 was excessive for main layer, maybe not though? Also I think I may have messed up my "Flow Adjust settings" looking at the above post. Can your verify what they are supposed to be for ABS? I set the speed to precision so it's going slow.

[Ryan Wheeler]

I have my filament diameter smaller since the CubeX filament measures closer to 1.7mm.  Maybe try to make that smaller & get flow rate up a bit.

[Giovanni]

Are you using original 3Dsystems ABS or another brand ?

[Sam Ferguson]

I am using black and red ABS filament from Filament Direct. I set the KISSlicer to 1.7 and I bumped the temps back up to 270 C for first layer and 265 C for the main layer.  Additionally I re-leveled the thing and that seems to have fixed it.  

[Giovanni]

Suggested temperature for your filament is 210-230°C.

[Sam Ferguson]

Crazy that's so low compared to what I'm printing at now.  Is this off their website? I'll give is a shot but I'm thinking it might not stick to itself.

[Giovanni]

Yes it's from their Web site, look under additional information.