Just got my Lulzbot Mini last night.
The 1 m HIPS that came with it printed the rocktopus pretty much perfect on the suggested cura medium hips quick preset. The back of the rocktopus head has very similar overhangs as this part and there is no evidence of this at all on the hips print. Being bright yellow I was not able to get a decent pic of it.
I had some ABS from Frys that I picked up on the way home (I have some lulzbot ABS coming as well, but I could not wait). The stuff is Shaxon brand. http://www.frys.com/product/8023384?site=sr:SEARCH:MAIN_RSLT_PG
It extrudes fine and prints most thing really darn nice. It is not doing well on overhangs though. When I try that I get these ‘noodley’ bits where it looks like the far outside wall filament is laid down and before it fully cools, it ‘flops’ off the layer it is on towards the outside of the model.
The engineer in me says this is a cooling/heat issue, but I am not sure if it is too high or too low. My brain can make arguments for both, temp could be too high, allowing that filament to fall out of place when it should be more firm, but the temp could also be too low, maybe the filament would ‘stick’ better in place if it was hotter and more liquid.
I am using the CURA lulzbot mini medium ABS quickprint preset in the picture. That appears to be 240 C nozzle and 110 C bed. I can’t get any more details out of the program it seems, when I try to switch to advanced to see the settings, I always see the same default numbers no matter what quickprint presets I have selected. I get the same issue on high setting. I don’t know the layer height exactly, but doing the math by knowing the model height (20mm) and looking at the slice view, it looks like about 0.25 mm layer height.
Tonight I will try firing up advanced mode for the first time and play with nozzle temp. My gut says to try 235 C.
What do you guys suggest? Have you seen this issue before?