yeah... wd-40 can help but will not fix your printer... so... now is becoming very interesting, after excluding the normal under extrusion little devils it seems that you have a bigger evil. Half empty spools can cause problems too but i do not think that is your problem it seems to me that your printer had problems since day one.
I think if it was the power supply you would experience more problems and they shouldn't be only "skip" steps related.
If you can exclude:
nozzle (hole diameter and clogs)
teflon coupler
3rd fan
bowden tube
material feeder stepper motor angle (a stupid nut that pushes the stepper motor)
knurled wheel screw tightening
too tight material feeder
spool friction
stock filament guide friction
filament bends
nozzle temperature variations
too tight bed calibration
correct assembly of the head
increase the current to 1.5A
?
Next suspects are:
stepper motor
board
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I will also monitor the temp of the power supply with an IR thermometer over time. Monitoring and recording voltage seems pretty easy to me. How about the current. I think I need a clamp on amp meter that is very accurate and also records. I could then monitor the AC amps going into the power supply. Hopefully I know someone who has one, or some other device that easily records amps.
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