Servo-driven purge chute/brush and filament cutter depressor arms
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Servo arms to push a toolhead cutter lever, catch purged filament, and wipe nozzles. Easy scaling to fit your setup.
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These are designed primarily for multi-material printing on printers where the nozzle can't move beyond the bed area, like my VzBot 235.
The servo mounts to a 2020 extrusion using a scalable shim to get it to the perfect height. Typically you will have one servo with a cutter depressor arm above the gantry and one with a purge chute/brush below the gantry.
The brush arm is intended for the silicone brushes that come with Cartographer v3 and v4 probes. I believe these are the same used on the Bambu A1.
I used Miuzei 20kg servos for both. The servos have little ridges between the screw holes that you will need to clip or sand off.
The shim can be scaled to any height. For reference, for my Orbiter/Revo combo on a VzBot toolhead, I needed a 6mm shim for the upper mount and a 25mm one for the lower.