Carbon filaments

[Draconis 1]

Has any body used Carbon loaded filaments such as 3DXTECH 3DXNano ESD ABS+CNT.

I find that when printing a 108 mm model with a 15 mm raft, half of the raft breaks up

(the left side). Smaller models are ok (up to 50 mm)

The first layer is ok it is the next layers that cause the problem.

The raft looks like it has been plucked creating lumps of ABS that interfere with the print.

Anybody have any ideas to stop this?

Phil

[IRobertI 516]

If you could take a couple of well lit pictures of the print, that would help a lot in figuring out what's going wrong.

[Draconis 1]

Picture added hope this is good enough.

Phil

[gr5 2,002]

I'm guessing you have bad layer adhesion. Are the side fans on? You want them on the absolute minimum fan speed for ABS. Somewhere around 20%? You want them to spin and if you go too low they won't spin so figure out the absolute minimum for your fans and then increase by a few %.

The problem (my guess in this case - picture wasn't super helpful and looks fine) is that ABS needs to be much hotter when the second layer comes down or the new layer doesn't melt the layer below and they don't bond well.

[Draconis 1]

Found the problem, Print Bed was very slightly out of level

re-leveled the bed now prints raft OK.

I print without the fans on, otherwise the print will not stick.

Thanks,

Phil

[gr5 2,002]

Bottom layer fans off is the default in cura. But you need it for pla overhangs (for abs you want the tiniest bit of fan for overhangs - so I like around 20% fan - assuming 20% is enough to get your fan to spin - for some printers maybe not).