Just thought I'd say hello. I had a FLSUN Cube given to me recently. A friend had it for over a year, but never got the quality of prints he wanted. Somewhere along the line he did something that made him think he fried the motherboard. He ordered another one, but couldn't get the firmware to load. After a week or so of failed attempts to revive it, he sent the motherboard back and told me the printer was free to a good home. I'm fairly new to 3d printing. I have a Tevo Tarantula that I bought about 4 months ago. I have been happy with it. Especially after several upgrades, such as aluminum brackets, layer fan, dual Z, and a mosfet. I have looked over the Cube I now have, and think his print quality issues were likely due to assembly. I think some careful re-assembly and adjustment will take care of a lot. At this time I am waiting for a new motherboard to arrive. I tried several times to load Marlin on the original, but it wasn't happening. The firmware will be my weak spot. I have very little experience setting up Marlin. However, in order to learn we have to start at the beginning. Please feel free to share any tips with me that you feel are worth mentioning. Thanks
I had a year of problems loading the firmware getting timeout errors if not completely hung up.
Yesterday I've found that the touch panel is interfering with the firmware loading (don't ask me why). Fact is that if I unplug the panel, the firmware loads correctly.
The printer prints great. It just vibrates a little so I am thinking in putting some structural reinforcements but without them the print quality is very good already.
I'd recommend building with a carpenter square. The printer is solid and performs well.
2nd thing is print a new carriage. Lots listed on Thingi, but my favourite is: https://www.thingiverse.com/thing:2698523
The Z-endstop will drive you crazy. Upgrade to one that is adjustable: https://www.thingiverse.com/thing:2880852
I have 3 cubes and have modified the Z motor and plate with this: https://www.thingiverse.com/thing:2769778
I'm doing the other two the same.
I added these feet: https://www.thingiverse.com/thing:2477288
The acrylic parts will crack if tightened too much, even the mainboard plate I've printed a box to replace and mount them at the top of the printer: https://www.thingiverse.com/thing:3048734
Use these for the 8mm rods instead of the injection molded parts for the bearings: https://www.thingiverse.com/thing:2691875
Y axes carriage is crap (acrylic part). I've replaced with this: https://www.thingiverse.com/thing:2456008
The MKS Gen L board is a good performer. I run my cubes 24/7 for over a year and they have not failed yet. I'd highly recommend adding a mosfet for the bed!!!!
You can upgrade the drivers to TMC which will improve the performance and noise with this board.
I'm still running one printer with Marlin 1.1.2 without issues. The other two using 1.1.6 with autobed leveling.
Hope this helps.