3mm Pla clogging in long prints

Hi I have an issue my prusa i3 was totally fine on long prints with ABS.

Now I have got some PLA and cant print long print keep clogging.

I have E3D head and separate nozzle for PLA but that not seam to help much.


I have fan 100% on to extruder heat sink.


How can I prevent this I got print to do that takes 7.30Hours but cant get past 4 hours.

Temp used 180 first layer then 175 printed fine then stopped but part felt like not heat enough.

Boosted tems to 200 ist layer then 195 but got more printed then first try and part felt much better strength wise but nozzle clogged .


How can I get rid off this problem?

PS:
ABS was printed on 260 1st layer then 255 prints so hard so nice no cracks between layers.

Regards

I'm not a PLA master, but there is some talk about the retraction and clogging: [www.reddit.com]

Difficult to test if it happens after 4 hours.

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Prusa i3, Ramps 1.4. Catnozzle 0.4mm
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I think I found my problem.

Im was printing 1.75 and all gear I had it was 1.75 I thing that cause a problem .

I got one nozzle for 3mm filament I try that.

BTW I managed to do long print on 1.75 nozzle all I did is I changed layer height to 0.3 from .25 and its prints fine no clogs nice print .

Regards