<p>I've just built my first 3D printer. It uses a Bowden setup. </p>

<p>When I try to print the extruder starts fine, but after a few seconds the extruder motor start skipping and the nozzle is jammed. </p>

<p>I tried a cold pull, but it didn't help. I removed the PTFE tube and tried to push the filament with my hand, it works but at the start I need the push harder but after it flows fine. But if I reinstall the Bowden setup, it works fine for a few minutes, but after a few seconds it starts again.</p>

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<p>Note I am using silver PLA at 200-205&nbsp;°C. I tried to raise the temperature to 215&nbsp;°C, but it also jammed, and the filament what after I pushed out was black (it is a new hotend and I never used black filament before), like it was burned (if it is possible).</p>

It is useful to diagnose your problem if you provide more information, specifically what material you are using and what temperature you are using on your hot end.
Even without the above information, it is likely that the hot end temperature is too low. At a low setting, the filament in the nozzle will soften, perhaps even melt as deeply as needed to be extruded, but as new filament is provided by the extruder motor, it also cools the heater block.
By increasing the temperature, you're ensuring there is sufficient thermal energy to handle the incoming cold material.
It would be useful to increase your nozzle temperature by 5°C for each test. Despite matching your controller's temperature to the manufacturer's specification, you can not be certain that the temperature at the nozzle and heat block are what you have programmed.