Hello. Week ago I have bought a 3d printer (DIY kit of Zonestar P802YA). After spending 2 days assembling it and then even more trying to calibrate it I managed to get stuff that looks like proper model. But unfortunately layers have sections where filament thread is thinner and thus creating holes. I took some photos of two of my models:
Here are photos of 2 models of same g-code(1 finished and 1 stopped):





You can clearly see those defects I was talking about. Also honeycomb grid is very messy.
I use PLA filament 1.75 mm. Temperature 210-230C. Do not heat bed. Feedrate 80. Flowrate 50. On the unfinished I used FdRate - 65-70 and FlRate - 50-65. Which values should I adjust to fix this?
Here's Dropbox link to the model.