extruder stepper problem.

My stepper seems to be skipping or stuttering. I dont know which or what could be the cause. Anyway here is a video showing the problem. Any info would be much appreciated.

Video - YouTube

It looks like your print is starting too low. There's a massive pressure build up in your melt chamber and it's making your extruder skip. Does it keep skipping above the first layer?

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yes , in the video i dont focus on it but the print is very choppy and some areas are filled nicely and others are just hairline strands. i am using 3mm though so it might be too tough to push through the hotend? ill try increasing temp to help.

also on a side note im using gen6 electronics(i know ancient right) and the stepper driver heatsinks are very hot to the touch, with the printer being on for just a few minutes... i dont remember this being normal. id turn the pots down but they arent even halfway.

Ran it for a bit and im 80% sure its do to stepper overheating and a clogged hobbed bolt. will need to clean and put on a large heatsink then retest.

my printer do same sound like yours and my extruder skipping when i print with low temperature,try rising hotends temperature litlle be or slow down yours prints.Highest speed need higher hotend temperature

It does stutter worse when its going fast, but the fastest im running is 40mm/s for infill. i had it running at 60mm/s before.

and temp i run PLA at 204 C, think i should increase it ?

also my voltage is at 2.8 , which is what my nema17 is rated for . but im wondering if i should increase it?

even at 2.8V after about and hour of printing the motor gets quite hot.

increasing voltage and temperature did help but it still skips, maybe too much resistance due to old style hotend ?