Solved Gap between layers Please help!!

Hello, we bought a R1 plus in March. It has been working so well since last month. Last week we tried to print out a prototype model, but every time we tried, it failed.
At the beginning it worked okay, but after about 20mins, gaps started to show up between layers, and finally the material came out from the hotend not continuous.
I attached some pics. Please help!!

 

Thanks for your reply!
I read the the link you shared, one thing I still not quite sure is that is R1 plus hotend all metal?

 

Hey guys,

I tried seasoning the hotend, but still very bad printing quality, or say even worse.
Any other possibilities??

 

I tried again, this is the first layer looks like

 

It could be under extrusion or the hotend is too hot. How hot is the hotend when you are printing?

 

hotend temperature is 210 as default setting

 

ok and what software are you using because it could be underextrusion

 

it's matter control 1.5

 

go to controls and scroll to the bottom and there will be sliding bar that says extrusion multiplier, what number does that say?

 

it says 1.
I attached the screenshot

 

ok go ahead and change it to 1.2 and click set, and then press print and tell me if its better or worse.

 

couldnt he/she press the 1.1 macro? on matter control

 

I tried 1.2 of extrusion multipliers. I would say it's worse.

 

so you will see a setting that says macros and it will haave .8, .9, 1, 1.1, 1.2. try 1.2