Ocuk don't sell resin.I don't believe so but the other company do sell many other products that the would classify as competition. For the record - forum text being the delightfully misinterpretable medium that it is - I wasn't having a go at VeNT, just reminding him as it's quite irritating when you get banned....I've been there.
I have about 20 2L bottles in the garden as we speak.In summer I leave 2l bottles in the sun, and use the resulting IPA for the first wash.
done quite a few upgrades to my qqs pro personally using 2208s myself as you say the stock A4988 are defiantely loud. I have braces on the guide rails and then further braces on the arms, have changed the bearings on the rails for higher quality ones , new spool holder which is on two 608 bearings i believe, extruder has been changed for a dual drive one as the old titan clone I found would slip constantly, changed the effector housing for a 3d printed version that further reduces the weight of the effector and new cooling fan ducts that give 360 cooling of the nozzle. Have printed the parts required for a flying extruder but just need to get a few springs for that to be mounted. Stock its not a bad printer but when modded its very good and Like you say extremely fast.
Are you printing black PETG by any chance?
I find the black (any make I've tried so far) sticks itself to the outside of the nozzle somehow so that by the end of the print, it's totally gunked up and there are resulting artefacts and stringing on the print. Grey or green PETG, no problem at all; clean nozzle at the end.
Y-axis limit switch on my Artillery X1 died on me yesterday, the bed just crunched into the hard stop - several times (!) before I figured something was up. That part seems to be difficult to get hold of in the UK in a timely manner so I had to order off Ali Express but that is still going to take a week or two. Meanwhile, I rigged up a mechanical switch glued onto a small wood platform and it work OK for now. This was not a part I expected to fail as the original are solid state switches so I don't know what failed. Wiring seems OK and it doesn't bend in use.
Can you change to optical switches? I converted my Delta to run them on each of the three pillars.