You should also align your start stop points into a seam to make the part look better. Print Quality Guide | Simplify3D Software 234
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What kind of nozzle do you have on your extruder. When I use a nozzle like E3d that has a flat bottom this problem is a little more apparent. I think its from the bottom of the nozzle not being completly square with the bed. What I have done to remedy this is take some 400ish grit sand paper that has the sticky back and put about a 2 inch peace on the bed then lower your Z to where it slighly touches it. then manually move the head along the sand paper. You just have to take off a few thousandths of the top of the extruder just to make it perfectly square with the bed.
If you think of the hole that the filiment comes out as BIG hoola hoop and picured it going back and forth but say one side was an inch higher(3d printer Microns) when you move one direction the lowest point will drag behind leaving the laid filament a uniform height. But when you move the other direaction (The highest part of the hoola hoop trailing) The filiment coming out is not being laid in uniform height. So when the next layer is being put down the lowest part is dragging on the un uniform surface and will drag these little guys and hang them off the edge.
Also if your extruder has any slop in it in the sense that it leans ever so slightly can cause this. Its usually more aparent when your running thin layers. When your layer heights are thicker this usually goes away because the nozzle is so far away from the previously printed layer.
We moved back to 0.35mm nozzles from 0.5mm after replacing the heatsink and hotends (Leapfrog support proved to be very helpful!) and it’s taken a while to get the settings dialled back in. We tend to use PolyMax for PLA prints as we have found it very easy to print but have had blobbing since changing nozzles.
Couple of things I have noticed making a big difference (with Polymax):
- filament diameter - measure up with callipers or a mic - we take several measurements over a meter or so with two measurements at 90 deg at each site and then average those.
- retraction - 5mm
- retraction speed 100 (no higher or we strip the filament)
- coasting - set 1-2mm
- wipe set to off
- relative extrusion distances - set to on
- Force retraction between layers - off
Specific to PolyMax:
- temp 225C with fan set to 40%
- reduce temp to 205, wind speed down and increase fan to 100% in S3D for fine detail stuff at top of print
Verbatim and rigid.ink PLAs haven’t been playing ball with the 0.35mm nozzles.
(eta - this is a Creatr HS)