K1 bmg extruder with runnout sensor, ptfe collet and filament cutter

Here's the latest models for the k1 extruder with fs, cutter and ptfe collet. Still doesn't require any supports other than the two built in. It will require low profile or button head m3 bolts (2x M3x10) for the cutter and idler latch. For the filament cutter spring, you can use most pen springs or cherry mx switch springs. I'm currently using 80g switch springs (3.8mm od, 15.3mm length, 0.3mm wire). Don't worry too much about the spring dimensions/strength as it's only really meant to keep the cutter open.

9mm snap off blades I've used https://www.amazon.com/gp/product/B0CCRD8HMW/ref=ox_sc_act_title_1?smid=A2BIQUX6X6HBVS&psc=1

The ptfe cutting guide is for the short peice of ptfe between the hotend heatsink and cutter and can be reomved or left in after cutting the ptfe tube to length. I'd recommend spinning a philips bit in the ends of the ptfe tube to smooth them out.

The rear bumper for the k1 uses an m3x20 socket head bolt to hit the cutting arm. It bolts into the back panel mounting point at the center of the frame with a longer m3 bolt to support the left side (from the back).

Config and wiring info for the fs can be found on henlor's original k1 fs extruder cover https://www.printables.com/model/651002-k1-extruder-filament-runout-sensor

Configs for reference (these will be up to you to tune)

[gcode_macro F_CUT]
gcode:
   CG28 #Conditional G28
   G90
   M104 [S220]
   G0 X32 Y213 F15000 
   G0 Y220 F15000
   G0 X55 F800
   FORCE_MOVE STEPPER=extruder DISTANCE=-5 VELOCITY=5
   G0 X32 Y213 F15000
   G0 X68 F15000
   G0 Y221 F15000
   G0 X52 F1000
   G0 X68 Y213 F15000
   M109 S220
   FORCE_MOVE STEPPER=extruder DISTANCE=8 VELOCITY=15
   FORCE_MOVE STEPPER=extruder DISTANCE=-50 VELOCITY=25

#Replace the original Load_Material macro in gcode_macro.cfg

[gcode_macro LOAD_MATERIAL] 
gcode:
 LOAD_MATERIAL_CLOSE_FAN2
 M109 S{printer.custom_macro.default_extruder_temp}
 G91
 G1 E100 F600
 LOAD_MATERIAL_RESTORE_FAN2

#Conditional g28 will home the printer only if it isn't already homed

[gcode_macro CG28]
gcode:
   {% if "x" not in printer.toolhead.homed_axes or "y" not in printer.toolhead.homed_axes or "z" not in printer.toolhead.homed_axes %}
   G28
   {% endif %}