So I just managed to get around to putting the second mk2 kit I have on an elegoo neptune 2 printer and it seems that when I attempt to print anything while the filament is fed through the MK2 and tubing down to the stock extruder I get under extrusion. However if I simply feed filament into the extruder (printing as if the mk2 kit isnt installed) the printer prints perfectly fine. I've troubleshot things by taking the Y splitter out of the equation and making sure that there isnt any kind of motor engaged at the selector/motor/cam area so I was wondering if anyone has ever had an issue like this with either the elegoo neptune printers OR ender 3 clone type printers and if so what they did to fix it?
The couple options I can think of is to replace the stock motor with something beefier (I prefer to not do this) OR another idea I had was see about re-calibrating the e-steps and give it a bit more filament pushing to try and overcome the under extrusion.
Any thoughts/suggestions?
Can you feel any friction in the system when you pull the filament through by hand? It's possible the PTFE, connectors or something is causing an increased amount of friction, but I'm not aware of anyone reporting this previously. To trouble shoot, just pull it by hand through each of the 4 colors and compare them. (Also, have you noticed it on all 4 or just one of them?)
This is the actual cam I was having problems with feeding the right lengths in the T0 slot in the thread here: (). I've only tried feeding filament through T0 on this particular test so once the printers done printing the switch cover I'll see about sending the filament back through the mk2 and testing the other paths out.