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Place a sheet of paper on your heated bed. Remove any residual filament coming out of the nozzle.
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Center your extruder on the X axis. Move it down by rotating both the Z lead screws at the same time. Move the extruder down until the nozzle is just touching the paper.
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Stop when the nozzle is just touching the paper.
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Place the middle section of a zip tie under the Pinda.
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Loosen the M3x10 screw and gently move the PINDA down until it is touching the zip tie.
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Tighten the M3x10 screw to secure the PINDA in place.
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Plugin and turn on the printer.
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Using the screen menu, move the X axis up until it crashes in to the Z tops. The stepper motors will skip. making a noise - this will not damage the motors.
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Using the screen menu, move the X axis down until the nozzle is approximately 10-15mm from the heated bed.
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If you have applied tension to the belt, unscrew the belt tensioner on x_end_idler until the belt is relaxed.
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Loosen the screws which secure the trapezoidal nuts. This is to ensure that the Trapezoidal nuts 'self-centre' on the lead screws.
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Make sure the trapezoidal nuts are moving freely.
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Tighten the 4 screws alternately (on both sides). Don't apply any lateral force on the trapezoidal nuts.
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Move the X axis to the middle of the Z axis and shutdown the printer.
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Tighten the belt until the belt is straight and doesn't sag. Don't tighten too much, you should still be able to pinch the belt with very little force force.
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Loosen the two pulley set screws a little.
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Adjust position of the pulley to have the belt centred. You can move the extruder by hand, to the left and right, to verify that the belt is centred.
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Tighten the set screws alternately.
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Verify that the belt is not touching the x_end_motor and that the drive pulley is not touching the X motor.
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Grip the X motor shaft with pliers to prevent it moving (grab the flat side of the shaft). Tension the belt, by tightening the screws in the x_end_idler. Do this while trying to move the extruder to the left or right. The belt should stay straight and should not bow up and skip over the drive pulley teeth.
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Thread two M3x10 screws in the x_end_idler. Don't tighten them fully yet, it will be done on the next step.
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Adjust both M3x10 screws to have the x_end_idler parallel to the frame.
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Second image shows when the X axis is too short. In this case you need to tighten the two M3x10 screws.
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Third image shows when X axis is too long. In this case you need to unscrew the two M3x10 screws.
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If you have difficulty to see if the x_end_idler is parallel to the frame you can use a thick ruler or a square like on the first image.
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Verify that your Z lead screw is not touching the Z tops holes. If it is touching release the pressure from the X smooth rods tensioning screws like explained in the previous step.
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Double check that your belt is still well tensioned. In case it needs adjustment repeat the previous step.
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Select and download the latest Bear calibration firmware here: github.com/bear-lab-3d/Prusa-Firmware/re...:
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MK3S Einsy-Rambo 10a firmware name: Bear_Cal_FW***_MK3S-EINSy10a.hex
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MK2.5S Mini-Rambo 13a firmware name: Bear_Cal_FW***_MK25S-RAMBo13a.zip
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MK2.5S Mini-Rambo 10a firmware name: Bear_Cal_FW***_MK25S-RAMBo10a.zip
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Get a USB A to B cable.
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Connect the USB cable on the Mini-Rambo / Einsy-Rambo.
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Connect the other side of the USB cable to your computer that is running PrusaSlicer.
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Turn on the printer.
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Start PrusaSlicer software and go to the top menu Help -> About ...
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Verify that the slicer version is equal or greater than 2.0.0.
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If version is equal or greater: go to the next step
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If your version is lower: download and install the version shown above from this page: prusa3d.com/prusaslicer.
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Verify that the printer is turned on.
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Start PrusaSlicer and navigate to the top menu Configuration -> Flash print firmware
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Select the appropriate Bear calibration firmware *.hex file using the Browse button.
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Verify that the printer is detected in the "Serial port:" window. If not, check that the USB cable is firmly connected to both the printer and the computer. select "Rescan"
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Click the button Flash! to flash the Bear calibration firmware.
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Wait until you get a Flashing succeeded! message.
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Turn the printer off and and then on.
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Run the "Selftest" in calibration settings.
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In Settings -> Temperature -> Fan speed set a value at 130 if you print lots of PETG and 255 if you print lots of PLA. For other materials select according to your most used filament.
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Run PID calibration in calibration settings.
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Choose a temperature that matches your most used printing temperature.
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Heat up the nozzle by selecting Settings -> Temperature -> Nozzle: and insert PLA filament.
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Make sure you have the steel sheet on the printer.
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Run Calibration Z. You may repeat the procedure.
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Select and download the latest Prusa firmware here: prusa3d.com/drivers :
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MK3S Einsy-Rambo 10a firmware name: FW_MK3S-EINSy10a.hex
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MK2.5S Mini-Rambo 13a firmware name: FW_MK25S-RAMBo13a.zip
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MK2.5SMini-Rambo 10a firmware name: FW_MK25S-RAMBo10a.zip
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Verify that the printer is turned on and USB connected.
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Start PrusaSlicer and navigate to the top menu Configuration -> Flash print firmware
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Select the Bear calibration firmware *.hex file using the Browse button.
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Verify that the printer is detected in the "Serial port:" window. If not, check that the USB cable is firmly connected to both the printer and the computer. select "Rescan"
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Click the button Flash! to flash the Bear calibration firmware.
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Wait until you get a Flashing succeeded! message.
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Follow our "Extrusion multiplier" guide here: 8. Extrusion multiplier and filament diameter
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Congratulations, you have finished to install and calibrate your Bear extruder.
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Happy printing :)
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