Einsy Rambo MMU Question

[Sloppsta]

Hey guys, Sorry to bug you, but I have the Einsy Rambo and just preordered the MMU 2.0 upgrade to go on a hypercube style printer I am building. My question is this.
Looking at pins_einsy.h i see that E_MUX2_PIN is pin 78, but looking at the einsy rambos schematics, pin 78 is not connected.

Am I just looking at this wrong?

Thanks

// Průša i3 MK2 Multiplexer Support
//
#define E_MUX0_PIN         17
#define E_MUX1_PIN         16
#define E_MUX2_PIN         78   // 84 in MK2 Firmware, with BEEPER as 78

[3d-gussner]

@Sloppsta Made a pull request prusa3d/Prusa-Firmware#182 in the past for the Prusa MK2 branch this and other PRs never made it into the MK3 branch.
The E_MUX2_PIN stayed from the early MMUv1 super switch stage.
As the MMUv2 has a own ATmega2560 controller board with 3x TMC2130 drivers i expect that it will be serial communication between the EINSY (P3 pin 3/5 TX2/RX2) and MMUv2 board. With 5 filaments in MMUv2 it will be hard to squeeze that in 2-bit (MMUv1) ...maybe they are doing something else ... we will see.
Hope that helps

[amoose136]

I have one on the way that should arrive sometime late this month or next and will be in the same boat as far as getting it working with Marlin goes.

[Sloppsta]

I will probably not recieve mine until October. Maybe someone smarter than myself can help bring the new mmu into marlin!

[boelle]

@Sloppsta

This Issue Queue is for Marlin bug reports and development-related issues, and we prefer not to handle user-support questions here. (As noted on this page.) For best results getting help with configuration and troubleshooting, please use the following resources:

• RepRap.org Marlin Forum
• Tom's 3D Forums
• Facebook Group "Marlin Firmware"
• Facebook Group "Marlin Firmware for 3D Printers"
• Marlin Configuration on YouTube
• Marlin Discord server. Join link: https://discord.gg/n5NJ59y

After seeking help from the community, if the consensus points to to a bug in Marlin, then you should post a bug report.
Before posting a bug report please test with bugfix-2.0.x to check if problem is gone

[boelle]

@thinkyhead think we can close this one

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.