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tinkergnome's post in 2+ Extended not extruding - Help! was marked as the answer
All Ultimaker printers are built for material diameter 2.85mm. You don't mention if this printer is modified for the use of 1.75mm materials. So that's probably the main reason for the described problems: it's simply the wrong material.
In addition: i don't see a tension indicator at all on the last picture? Are you sure the feeder is complete and correct assembled?
There's a great guide from 3dVerkstan with a lot of pictures:
https://support.3dverkstan.se/article/64-disassembly-of-the-ultimaker-2-plus-feeder
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tinkergnome's post in UM2 rear 5V fan was marked as the answer
Another reference is the assembly manual
https://github.com/Ultimaker/Ultimaker2/blob/master/um2 assembly manual V1.1 _english.pdf
and the mainboard schematics:
https://github.com/Ultimaker/Ultimaker2/blob/master/1091_Main_board_v2.1.1_(x1)/Main Board V2.1.1.pdf
As fas as i can see the 5V cable inside the wiring loom should be pink (ground) and blue (+5V) - assembly manual page 65
There are pictures of the 5V fan and its connector as well (page 51)
Hope that helps!