Printing problem

I have problem printing with PLA. There is aspot that the prints not good.
Picture:


That problem only came out in the middle of an angle. But if the angle is wide and solid the print is smooth.
Picture is combination of 45 degree and 60 degree angle:


How do I eliminate that?

deeph

 

Looks like a cooling issue to me. Was this on the fan side or the opposite side?

 

The opposite side.

 

Dual ducted fans are the go.
http://www.thingiverse.com/thing:431160

 

Do you have another option, that cooling both the extruder heatsink and extruder nozzle?

 

No. Using a separate fan for the heatsink is much easier, you also don't want to restrict the cooling efficiency of the heatsink otherwise you could get jams due to heat creep. Just buy some extra 40mm 9 blade fans from eBay.

 

I have used 40mm to cool the heatsink from front side though, as my 2.5mm fan broke. I only have space from the rear, maybe looking for surrounding the nozzle style duct.

 

Did you see how I have my 40mm heatsink fan attached in my Thingiverse pic? 1 screw into an existing hole on the side of the x carriage. I want to design a proper bracket/duct for it but it's been working so well add is it's low on my priority list.

 

Didn't realize that. I almost mounted the fan like that but what size of screw did you use, 4mm? I have tried with 3mm screw but it loose. I'm afraid if using 4mm screw the hole will split.

 

I just used a regular screw with a course thread I had laying around sorry. Just make sure the shaft diameter of the screw is the same or smaller than diameter of the hole.

 

Thanks Mike, that problem is gone.

@Galaxius, I will search the bolt that snug fit the hole.

 

I'll take a photo with measurements on mine later today for you

 

Hope this helps.

 

Really appreciated, I think I have that bolt size. It actually bolt for wood if I'm not mistaken.