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The listed 1.2.4 hex file has a bug in it. The listed 1.2.6 has the fix incorporated. I tested both of them on my R2.
The last firmware version officially released is Marlin_1.1.6_RoboVersion_1.2.6_R2.hex
As @Lance Weston suggest, try heating the bed manually from the touch panel. 40 C is ok ( warm enough to the touch without hurting you )
The R2 FAQ has explicit instructions to help you determine your software and firmware levels. As far as Cura goes, I recommend that you upgrade to...
What release of firmware and software are you using? ( http://community.robo3d.com/index.php?threads/r2-faq.23706/ )
Correct. Just don't use G36 coding. G28 followed by G29 works better if you wish to use auto-leveling.
As the print bed approaches a true level, you need to be careful with adjusting the corners. For glass plate surface, if the four corners are...
Have a look at this procedure:
Apologies Lance. I fail to see the " dual hotend capability" in the attached images.
I would say that differences in the overall length would be a major concern.
Power supplies can develop a major noise problem ( a rare type of problem ). At least now you know, for certain, where the problem is.
Just for the sake of completeness, please try swapping the power supply between the printers and see if the flawless working printer continues...
Might be debris in the nozzle. Have a look at this article: http://community.robo3d.com/index.php?threads/purging-the-filament.23661/
It certainly will not hurt to replace the main board. I was considering the cost of repair and heat sinks would be less expensive.
Nice to know about the fans of the power supply. I was referring to the internal fans of the printer ( like the ones at the hot-end ), not the...
Backups of the firmware settings and RoboOS can save you when one or the other gets corrupted.
It's 6 months since the problem was posted. Did everything work out for you?
Slicing software can introduce problems. Point in case: I use the appimage version of Cura under Linux. The latest version is 4.7.1. I was running...
According to an article posted for this part, the problem might be the heatsinks....
Always leave in the G28 command so that the hot-end always starts from a known position. Makes for repeatability while printing.