Wintermute

Reanimating an old topic: got Wanhao Duplicator 4S second hand real cheap. Looked like a machine with good specs, but old. What I did: - updated Sailfish firmware to 7.7 (followed the guide here https://groups.google.com/g/wanhao-printer-3d/c/-0pryBjsd1g, the firmware page moved to https://www.thingiverse.com/thing:32084). No issues from the first look: printer runs and responds properly. - was not able to connect it to 5.2.1 Cura at all - cannot find it on USB. But, ages old ReplicatorG slicer does find it - can connect, slice and print. Too bad that I don't want (and cannot on my new Mac) use a 10+ year old slicer... - connected it to a current stable Octoprint server on Raspberry Pi 4. After installing and configuring GPX plug-in, can connect to printer and control/start printing. Sooo, everything is tip-top now, but, I have quite a bit of under extrusion, especially bad on the infill, but somewhat noticeable on walls too. Absolutely failed print is 20% Grid infill - just spaghetti on the inside. 100% line infill, 120% flow compensation, e-steps checked (100 mm extracted, no tuning needed). Looks better, but still small pieces of under extrusion. I also tried 60% infill: in general it looks as if when infill starts, the wall quality deteriorates significantly too. No infill - little to none issues. eSUN ABS+, range of different temps (220-265), and flow comp (100-120 for everything excluding the first layer). That's supper annoying and if someone has similar experiences, let me know;

I think the issue is the baudrate. I am in similar situation as you are (got Duplicator 4S second hand) and while I can. connect to it with ReplicatorG software, the Cura just does not see it. I plan to use it with Octoprint anyway, but meanwhile, if it is still an issue, you can have a look here