Voron trident purge bucket + nozzle brush

Update 20.12.2024

After recent mishap caused by improper flexplate placement with fully lowered bed 😅 few small modifications:

• added chamfer on front bottom edge, so even if plate is slightly misaligned, it should push the bucket back instead of pushing it up until it breaks and/or back motor stalls (in my case - both happened 😅)
• top bridge between buckets was thickened, which should make whole construction a little bit sturdier

Also, at the moment of failure it had ~25g of purge blobs inside with some space to spare. So it should be able to contain ~30-35g of that. That'd be ~10m of filament (before extrusion), or in my case, where I purge 40mm before print - around 200-250 prints before need to empty it (assuming no other purges).

Buckets are mounted in such a way that there is ~1mm between them and print bed (at least in my case). Designed to be mounted on the left side of the printer (I do have clicky on the other side), but if you mirror the arm, it should be mountable on the right. Or use the original one, but offset slightly more towards center :)

Arm is designed with Rapido UHF hotend in mind, if you use another one, you might want to check hotend+nozzle height and change Z dimension of that part.

All parts in 3mf are preoriented, hardware required:

• 2x 3x6 neodymium magnets
• 4 M3 screws for mounting (2 for mounting brush holder to arm + 2 for mounting to frame)
• 2 standard voron inserts for the arm
• 2 nuts for mounting to the printer frame
• nozzle brush, either brass one, or you can buy A1 mini brush (just the silicone part with glue) and print a block in place of the brush

Few useful macros, for me left bucket is roughly at X0 Y310 and right bucket is 70mm further. I used the speed of 600mm/s, but lower ones will work as well :)

[gcode_macro MOVE_TO_BUCKET]
gcode:
    ; select left/right bucket randomly
    ; higher range before random helps slightly with uniformity of results
    {% set x_pos = 70 * ((range(0, 100) | random) / 100) | round %}
    G0 X{x_pos} Y310 F36000
[gcode_macro clean_nozzle]
gcode:
    {% set th = printer.toolhead %}
    {% set old_pos_x = th.position.x %}
    {% set old_pos_y = th.position.y %}
SAVE_GCODE_STATE NAME=clean_nozzle_state

M400
G90
{% for i in range(10) %}
    G0 X70 Y306 F36000
    G0 X0 Y306 F36000
{% endfor %}
# go back to previous position
G0 X{old_pos_x} Y{old_pos_y} F36000

RESTORE_GCODE_STATE NAME=clean_nozzle_state</code></pre>