Tugboat printed badly--what to fix?
Just got an Ender 3 Pro used. Was told it printed fine but sometimes "a gear in the back stuttered." I genuinely believe the person who owned the printer before thought they were giving me a working printer, but I couldn't get anything to print yesterday. After cleaning the filament and replacing the nozzle I was able to see about 4 lines of printing before the nozzle clogged again. The idler keeps pausing/stuttering/stopping. Debating replacing some parts, but wanted to get thoughts first.
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Today after swapping to a .4mm nozzle I was able to print the tugboat shown below. Very excited that I was able to print something, but still clearly need some fine-tuning (stringing, incomplete surfaces, wrinkles/dropped lines on sides, text blurry/missing from side, weird flash on vertical edges).
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It looks like there might be some dust/derbis on my filament, so I carefully wiped it down with a cloth as the print was going. It's possible I added some dust (it was a tissue, not a microfiber cloth), but at least it didn't clog again.
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Here are the stats I have, not sure which are relevant:
Printed with Ender-3 Pro running Marlin 1.1.2 (2020-04-05).
Nozzle is .4mm, I'm 95% sure. Freshly installed by me with hand tightening mini wrench (while the printer was hot).
Nozzle heated to 200, Bed to 60
Used Ender brand black filament, 1.75mm
Sliced in Lychee:
Max Speed set to 50mm, but I had it going at 75%, the 80%, then 100% at different stages (I had a theory that a slight clog was causing issues at high speed)
Layer Height .2mm
First Layer Height .28mm
Infill Grid, density 15%
Top Layers 3
Bottom Layers 3
Shell Count 3
Adhesion type Skirt
Skirt Count 1
Skirt Offset 4
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I'm very new at this. All feedback appreciated. I'm sorely tempted to get these three replacement parts and hope it fixes things, but I don't really know if it will.
New dual gear extruder: [https://www.amazon.com/gp/product/B07SY745CF/ref=ox\_sc\_act\_title\_1?smid=A2QQQKMKGVNA5E&th=1](https://www.amazon.com/gp/product/B07SY745CF/ref=ox_sc_act_title_1?smid=A2QQQKMKGVNA5E&th=1) Teflon coated tube (to reduce clogs, which I think I'm getting frequently): [https://www.amazon.com/gp/product/B07PV9LCLY/ref=ox\_sc\_act\_title\_2?smid=ADOEF179U2TRC&psc=1](https://www.amazon.com/gp/product/B07PV9LCLY/ref=ox_sc_act_title_2?smid=ADOEF179U2TRC&psc=1)
Extruder Hotend: [https://www.amazon.com/gp/product/B07XM637F5/ref=ox\_sc\_act\_title\_3?smid=A3SNVVMEXOSKIB&th=1](https://www.amazon.com/gp/product/B07XM637F5/ref=ox_sc_act_title_3?smid=A3SNVVMEXOSKIB&th=1)
I'm debating getting these because a guy on Youtube who had a video with the same stuttering/stopping idler problem I had yesterday bought these parts and it fixed the issue for him. Replacing my (probably clogged) nozzle seemed to fix my main problem, but I know clogged nozzles are generally a symptom of something else.
