Under-extrusion after a certain amount of successful layers? My CR-10 is starting prints, BUT then makes weird spiral pattern, layers go up vertically with large gaps. Hollow infill.





I don’t know if it’s:
 - My Slicing skills
- original files
- the printer itself
Long explanation. Questions at the end. I’ve had beautiful normal prints. Then I’ve had these abnormal spiral layer prints with infill issues and spaghetti monsters (the images don’t show but, where the prints pictured end, is not the full print, it did the weird spiral then just stopped layering altogether). I’m semi-new to printing and don’t have too much of a tech background apart from average use. Been researching a couple months, I’ve only been printing for about a week. I’ve had an amazing couple prints. Baby groot was flawless, barely noticeable layers. The test print (a rather thick disk with deep grid marks and a puppy on top) that came with the printer was the same smooth flawless, it wasn’t my first print though. So the behavior seems erratic. The two prints pictured had several successful print in between them. 

I do know:

The elder wand file was in several tutorials and was printed successfully. Its in two parts. The first part, which is way shorter and thicker printed Amazingly. The second part pictured was double the height+ and 1/4 the thickness. I even printed it successfully once before going horizontally and flat against the bed. BUT I had to run the print three times because the filament would not stick to the glass. It was just being dragged along behind the nozzle. But I was observing so I ended the print before it went too far. All I did to change this was add a brim and supports. Which gave a “successful print” except the fact that one of the knobs has a flat spot and the support remnants were very noticeable. Resolution was terrible too. Hence why I decided to try printing it vertically.

The bigger print pictured is the base of a hufflepuff horecrux cup, the first time I printed it was with cura slicer, it came out beautifully but the stem snapped right under the base of the cup part st some point, and the left handle had some wierd stringing issues, like 7 pure strands of filament hanging out one corner, and the print failed s fee layers from top. However the file description only had one previous make listed and the thing with the top of the handle and print failed about the same with that persons print.

Sorry for the long post. I’d just really appreciate any help, and I wanted to give all the details.
This is partial answer and comment as it was too big to fit the comment section, it will be a proper answer once the question is updated by the OP.
What you call a weird spiral pattern is the result of under-extrusion. When there is under-extrusion, the resulting print is sparsely filled. The reason for this under-extrusion is most probably partial clogging of the nozzle, or an issue with the extruder itself. One explanation could be that you are suffering from heat creep, but the information you provide is not enough to explain this or any other solution further in detail. Clogging can e.g. be caused by retraction settings and/or temperature settings, without your settings it is a guess what this is actually causing this.

Looking at the print deteriorate the higher the Z becomes this is most probably a heat creep issue, so you print too hot with too large retraction settings.