That worked for me also, both the frame, and the blade holder.

Took me a while to find the commands. I am using a USBtiny. I updated the bootloader from the arduino IDE, and here are the locations/commands I used to perform the update from the terminal. I keep the files in iCloud (multiple systems) and that's where the 'Mobile\ Documents/com\~apple\~CloudDocs/' came from. cd ~/library/arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17/bin $ ./avrdude -v -p m328p -c usbtiny -U flash:w:~//Library/Mobile\ Documents/com\~apple\~CloudDocs/Documents/3D\ Printer\ Stuff/3DChameleon/M4ProFirmware/SelectorFirmwareMk4.ino.hex:i -C ~/Library/arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17/etc/avrdude.conf

I'm looking for some clarification on firmware versions. I purchased my unit in December, and it seems to have the Mk4 firmware. Do I need to upgrade it? After I solder the headers on, can I plug everything in and it just works? Or is there and 'Mk4 Pro' firmware to make the screen and cutter work? Or are they out there as 'hidden' features? How can I check the firmware version? (I have a USBTiny that should be here tomorrow, along with the screen. Just looking for some guidance on the new stuff and a full step=by=step to enable it.

I"ve seen this when unplugging/replugging the wall wart, but if I unplug and replug at the board, it works as it's supposed to.

would love to see a pic, or STL of what you built. The iCloud link isn't working.