Servo controlled nozzle cleaning brush

thingiverse

Since my hotend won't move off the heatbed, I need to have the nozzle brush hovering above the bed when cleaning but positioned off the side when idle. small video: https://youtu.be/kWGmyQm7iAg Be aware that the length and angle of the arm holding the servo are specific for my printer, so you may need to modify the attached Fusion 360 file. The mount of the arm is designed for a 2020 extrusion using two 2020 T-nuts and 4mm screws. The brush used: https://www.ebay.com/itm/1x-Stainless-Steel-Wire-Brush-Tooth-Brushes-Plastic-Cleaning-Rust-Detailing-New/132545087951?ssPageName=STRK%3AMEBIDX%3AIT&var=431896604988&_trksid=p2057872.m2749.l2649 The servo used: https://www.ebay.com/itm/4pcs-Rc-Servo-9g-Mini-Micro-for-Trex-Align-450-Rc-6ch-Helicopter-Airplane-Car-E/382585778668?hash=item5913e3b1ec:g:sdsAAOSwLmVXEFea:rk:1:pf:0 Cut off the handle of the brush to size, and then glue the arm that follows with the servo under the brush holder and screw it to the servo. For the Duet WiFi, I connected: servo Duet GND(brown) pin 30 GND +5V(red) pin 1 +5V signal(orange) pin 13 Heater 4 Then in the config.g file: M307 H4 A-1 C-1 D-1 ; disable heater 4 to be used to control brush servo Then use: M280 P4 S0 to store the brush and M280 P4 S160 to deploy the brush this depends a bit on how you orient the brush on the servo My start.g file deploys, moves the head and stores the brush: G21 ; metric values G90 ; absolute positioning M107 ; start with the fan off G29 S2 G29 S1 M376 H10 ; taper off bed level compensation G1 X15 Y15 Z5 G1 Z0.2 F3000 ; move the platform down G1 F1200 G1 X115 Y5 E10 G1 Z21.75 F3000 ; move the platform down M280 P4 S160 I1 G4 P1000 G1 X184 Y0 G1 X189 Y5 G1 X194 Y0 G1 X198 Y5 G1 X198 Y0 G1 X184 Y0 G1 X184 Y0 G1 X198 Y0 G1 X184 Y0 G1 X198 Y0 G1 X184 Y0 G1 X198 Y0 G1 X184 Y0 G1 X198 Y0 G1 X150 Y0 M280 P4 S0 I1 G4 P1000 G1 X15 Y15 G92 E0 ; zero the extruded length