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Additional hardware:

Two M3x10 : To fasten the mount to the ultimaker
Four M2x10 : to fasten the pi to the mount and standoffs
Four M2x? : to fasten the BTT board to the standoffs (already included with btt board)

Best way I found to use new BTT board with existing power supply is to utilize klipper and use BTT board as an auxilery board. I use the BTT board for the quite steppers and non-pt100 thermister.

Note: If you want to use a single power supply for both boards you will need to tap in to power traces from PCB which may not be safe.

Note: If you want to use a controllable heat sink fan you will need a 24V fan connected to BTT board instead of the 5V Ultimaker board fan.

Steps:

Get klipper working with no hardware changes:
1. https://www.instructables.com/Ultimaker-2-and-Klipper/
once confirtable add btt board
1. make changes to your printer.cfg configuration
  1. Added mine as reference

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