Riddle me this Batman

Why, all of a sudden is this printing with two different looking areas (top and bottom). A slight ridge at division line (only on outside). Tried redoing surface of drawing with "Surface from Planar curves" and "Sweep two rails" and "Patch" with the same result. Temps stay consistent throughout print. I'm baffled.

Filament was dryer at the center of the spool? Or temperature that far from the bed is lower??

Edited 1 time(s). Last edit at 09/25/2016 01:38AM by etfrench.

It does this every time you print it?
If so then it's not a change in the filament.

It's a sharp change, so I'm thinking maybe you have a slowdown setting enabled in your slicer (for Slic3r: Filament settings, Slow Down...)

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My printer: Raptosaur - Large Format Delta - [www.paulwanamaker.wordpress.com]
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hello friend

Printed this twice and got exact same look at the exact same height. I'm going to try again with a fan and see what happens. Have printed many of these in the past with no problems. I'll be back.

I wonder if it has anything to do with the comment I made in the other thread?
bottom part looks great....

perhaps the power of the pyramid is focused more to the tip...or its sharpening your trapezoids

Edited 1 time(s). Last edit at 09/25/2016 05:38PM by MechaBits.

The original drawing was a very thin wall and though flimsy it always printed beautifully. I redrew it doubling the wall thickness to make it more durable. I noticed in Slic3r print preview that the boundary between the top and bottom is visible. This print was with Cura and though the division line is still slightly visible and there is a tiny ridge at the division line it came out much better with the exception of the crappy top and inside. I got the same crappy top before adjusting my stepper voltages yesterday. Smooth tops until the Cura print. Odd. I'm printing the thin wall version write now to see what happens.

looks more like a temp thing there.

After I'm done trying the thin wall version I'm going to print the thicker one with all "Perimeter" speeds the same to see if Mr. Wannamaker is right. Large and small perimeter settings were 40mm/sec and 20mm/sec. Not sure what Slic3r considers small but should be interesting to see what happens. I've posted the lamp if you guys want to slice this yourself. Look closely at the print preview and see if line is visible.
[www.thingiverse.com]

P.s. thin wall print is smooth at that point right now.

Quote
MechaBits
looks more like a temp thing there.

I would agree, either increase cooling as it gets near the top or slow down the print speed or place a tower next to it, so that it moves away from the main print which will increase the print time for each layer.
It's over heating due to the short time it's on each layer which doesn't allow the previous layer to cool enough to support the next one.

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Printer: Ormerod 2 (528.4) Duel extruder set-up with Aluminium X-Rib, RRPro Firmware v1.11-ch (2016-04-08)

Well, you were right to a point. Sides came out even but top was lumpy again. The thin wall version came out perfect. Thanks for all of the input.