What is going on here on the lower layers?

3D Printing
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What is going on here on the lower layers? I’ve seen a lot of problem prints but this one is new to me, the layers higher up seem pretty good. (edit: the lower part is supposed to be smaller than the top part, it’s meant to be tapered, see the last “thing” on TARDIS Run board game - Print in one board by cymon - Thingiverse. Perhaps that is related, something to do with small area print or overhang or something?) This is with ABS on Bukobot 8 v2 duo. Sliced using Cura, 150mm/s, 225C hotend temp, 120C bed temp, directly on glass, brim turned on. Or as it says at top of the gcode:

;Sliced at: Mon 14-04-2014 18:07:19
;Basic settings: Layer height: 0.1 Walls: 0.4 Fill: 20
;Print time: #P_TIME #
;Filament used: #F_AMNT #m #F_WGHT #g
;Filament cost: #F_COST #

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Clearly the TARDIS is being sucked through some spatial anomaly or other :slight_smile:

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Try lowering your heat bed temp after the first couple of layers.

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Its overheating and deforming. Raise the minimum layer time, or print more things, or add a cooling tower with a pause.

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It was made for the movie beetle juice!

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Thanks for the tips everyone! Didn’t even think about overheating, usually my problem is cooling too fast.

@Sonex128 right now it’s set to 120C (this is ABS), what would you recommend setting it to after first few layers? I’m afraid of setting it “too low” and having the part pop off like I’ve seen happen occasionally as the print cools after it is done…

@Stephanie_A would those tips go along with Brian’s suggestion of lowing bed temp after first few layers?

Something else I’ve seen, I think it may be related, is on prints with a flat top and infill underneath, sometimes I get what looks like “busted bubbles” in the top layer, it almost looks like it might be caused from hot air pushing up right after the infill hole is “capped” by a top layer, would lowering the print bed temp after first few layers help with that?

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Yes you can use it it along with Brians suggestions.
Busted bubbles is often caused by moisture in the filament.

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My last roll of ABS I had to set bed to 80 degrees C after the first layers. I always print with Aquanet hairspray on the glass.

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@Christopher_Benjamin @James_Schmittberger Yes on both counts! I have a fair number of Dr. who fan friends (some of which don’t have a printer), so thinking my failed prints will probably find a home other than my failed print box! The kid also likes playing with some of the “solid” failed prints too, so not a total waste :slight_smile:

Actually my kid saw that charm printing and yelled out DOCTOR WHOOOO! (which is pretty cool since he’s 2) :slight_smile:

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Update… Got it printing very well, thanks again everyone! Can see the before and after shots here

https://plus.google.com/107135223842772760876/posts/SEFbzkj7hgC

Slowed print down to 80mm/s, set min time for each layer to 40s (was at 10), and changed infill to 35%. For some reason it looks like 90% when it was printing, I’ll experiment to see what cura is doing there tomorrow.

Also I still see a very small amount of warpage on one of corners, maybe adding a post to the print will help with that (or just print 2 + at once), but as-is you have to be looking for it to notice the imperfections.