I have a Monoprice Maker Ultimate 3D printer (a rebranded Wanhao Duplicator 6) and out of the box the hotend temps when set to 200 would vary between 190 and 210. I used repetier-host to run PID tuning and stored the last set of values it gave when it finished, however I'm still seeing around 5 degree temp swings.
Here's a screenshot of the temp during a Benchy print from Octoprint:
I tried PID tuning again, which gave different values, but basically the same results. Is there anything I can do to improve this? The Maker Select Plus I had only seemed to vary +/- 1 degree so I'm assuming this is more than expected. (I don't actually know what the implications are, so I don't know whether it is/will affect my print quality).
Is there another way of tuning (I don't fancy manually tweaking numbers and testing for hours), or if I do more than 8 cycles (the default on the Wiki page linked above) would that improve the accuracy?