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Well, I'm getting "stk500v2_getsync(): timeout communicating with programmer" when trying to reprogram a RAMBo that previously worked. Given that the LCD was damaged by static discharge, I'm seriously considering not even trying to reload the bootloader via ICSP. The printer still runs fine, so the Mega 2560 is fine, I just can't change the firmware. (In this case to play with the Y adapter.)

I've gone through all the usual googling and troubleshooting, including having another Arduino Mega 2560 lying around to test loading the firmware.

So... time to buy a Duet and make rewiring around that the next project instead? My big reservation remains that I'm kinda sick of Arduino and wish one of the competing projects were farther along.

Any recommendations?

T-Rex says to "make it bigger and also chocolate." I'm not sure if she's talking about 3d printing.

Do you have a PI laying around? I've had a similar thing happen when my computer wouldn't flash the rambo, but if I hooked it up to a PI and flashed it directly with AVR Dude it'd work just fine. After that flash it started working on the computer again too. Dunno why.

avrdude -v -p m2560 -c stk500v2 -P /dev/ttyACM0 -b 115200 -D -U flash:w:FILENAME:i

I'm pretty sure I need to flash the bootloader, but since I don't have an AVR programmer, I'm worried about bricking the otherwise functional RAMBo trying to program it using another Arduino.