Here’s the Deal
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When comparing Polar Cloud vs OctoPrint, the Slant community recommends OctoPrint for most people. In the question“What are the best web interfaces to control common 3D printers?” OctoPrint is ranked 1st while Polar Cloud is ranked 3rd.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Print from the Cloud to any networked printer
Pro Very responsive support
Pro Well supported by common slicers
For example, both Slic3r and Cura can successfully upload to OctoPrint.
Pro Open source
Everything is available here.
Pro Works well with slow hardware
OctoPrint functions well even with slow hardware, like the Raspberry Pi 2.
Cons
No cons yet!
Con Takes a while to boot
You have to wait some time while it boots, possibly because it creates some caches in advance.