Crossbow Cutter Mounting Block for Mercury One.1

This is a modified version of the ZeroG Mercury 1.1 front left tower and a mounting block.  The mounting block uses one M3 screw to engage the Crossbow Cutting Arm.  This is designed for use on the A4T toolhead, but may work for other toolheads, depending on the height.

BOM:

4 (or 5) M3 Heat Set Inserts (M3x5x4, the usual Voron style)
2 M3x6-8mm Screw
Original Left Tower Hardware
1 M3x 12-20mm Screw

Directions:

1. Print with Standard ZeroG Print Settings
2. Install Heat Set Inserts, 3 in the front left tower (1 in the usual spot, 2 on the top of the tower)
3. Install Heat Set Inserts, 1 minimally, 2 optimally, in the mounting block (one on each side of the block)
4. Install the tower as usual.
5. Use 2 M3x6-8mm screws to mount the block to the top of the tower
6. Thread the M3x12-20mm screw into one side of the mounting block.  It should screw in long enough to reach the second heatset on the other side, to ensure it doesn't move
7. Adjust the depth of the screw to match your Crossbow Cutter lever
8. Create a FILAMENT_CUT macro, the one I use is at the bottom, but you will need to adjust it for your bed parameters.
9. (Optional) Create an exclusion zone in your slicer of choice to make sure the lever doesn't interfere.

[gcode_macro FILAMENT_CUT]
description: Move toolhead to far left to cut filament
gcode:
 M118 Initiaing Filament Cut
 {% set moves = params.moves|default(10000)|float %}
 {% set cuts = params.cuts|default(2000)|float %}
 {% set retract = params.retracts|default(-10)|float %}
 # Set Relative Extrusion Mode
 M83
 # Set Absolute Positioning Mode, if not already
 G90
 # Reset Extruder
 G92 E0
 ## Move To Safe Location Pre-Cut
 G0 X-10 Y-15 F{moves}
 ## Move To Pre-Cut Position
 G0 X-16 Y-15 F{moves}
 ## Move To Engage Cutter
 G0 X-16 Y4 F{cuts}
 ## Retract To Disengage Cutter Arm if Temp appropriately high
 {% if printer.extruder.temperature > 200 %}
   M118 Post-Cut Retraction
   G1 E{retract} F600
 {% else %}
   M118 Extuder Not Hot, Cannot Retract To Disengage Cutter
 {% endif %}
 ## Move Back to Pre-Cut Position
 G0 X-16 Y-15 F{moves}
 ## Move To Safe Location Post-Cut
 G0 X-10 Y-15 F{moves}

Macro has been updated with suggestions from Armchair Heavy Industries Discord, to slower cut motion and retract while cutter engaged.