I’m having a new issue that I can’t figure out – my top layers have messy zits and burps on them.
My first layers are coming out beautiful; no warping or un-sticking, and the strings and blobs are under control on the sides of the prints. I’m still working on getting the Z-hop setting optimized, but things are generally looking pretty awesome…except for on top. It only happens on fairly large, horizontal surfaces with fill underneath them. It doesn’t happen on slanted surfaces, only flat ones, and on these pieces, the thinner solid areas don’t have the problem; only the ones where the piece was thick enough to have some fill layers. So it’s something about the fill, but that’s as far as I can get in figuring it out.
Here’s a photo to show you what I mean. If you look close, the larger “burps” even look like they’re discolored, although I think maybe that’s a trick of the light, since it doesn’t seem likely the filament would actually discolor like that. I didn’t go through any major nozzle-cleaning stuff when I started this filament, but I printed two fairly big prints with it before this one, and it’s feeding smoothly, so I doubt there’s any residue of anything else in the nozzle.
I’m using a Taz 5, 0.5 mm nozzle, Hatchbox ABS. Print temp 230º, bed temp 110º, using Simplify3D with default ABS “medium” (0.2mm) settings except that I’ve tweaked the retraction distance and speed, Z-hop, increased top and bottom layers to 4, and slowed the print speed. (Okay, maybe not so default any more… )
This photo is of a print of one of the Settlers of Catan border pieces from http://www.thingiverse.com/thing:26979.