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Right to Repair

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5. Software configuration

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5. Software configuration

      • This step is only needed because no custom firmware is available yet.

      • You can use the latest Bear Calibration firmware or the latest stock Prusa firmware.

      • Download gcode files using this link: https://github.com/gregsaun/bear_extrude...

      • Copy the following files to your SD card

      • bear_hemera_config_mk*.gcode (choose the version corresponding to your printer)

      • This file is used only once to configure your printer to use the Bear Hemera. You can reset this configuration anytime by running the reset_to_prusa_mk*.gcode

      • unload_filament_hemera.gcode

      • You have to use this file every time you want to unload filament from your Hemera. It is needed because the filament path is much shorter than Prusa extruder.

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      • This step only needed because no custom firmware is available yet.

      • Insert the SD card in your printer with the Bear Hemera

      • In the menu of your printer select "Print from SD" and choose the file bear_hemera_config_mk*.gcode.

      • The printer might say it is an incomplete file but it is a wrong message, click to continue and print this file.

      • You can now delete the bear_hemera_config_mk*.gcode file from the SD card because it will not be used anymore.

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      • From the printer's menu, disable the fan check with the menu Settings -> Fans check - On / Off

      • This is needed because the Hemera fan does not have a third wire to read the fan rotation

      • From the printer's menu, disable the filament sensor with the menu Settings -> Filament sensor - On / Off

      • As of today, the Bear Hemera does not have filament sensor, therefore it is better to disable it

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      • From the printer's menu, run the PID calibration for your hotend with the menu Calibration -> PID calibration.

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      • Raise the X axis to more than 30mm by pressing the LCD knob for longer than 3 seconds. Turn the knob to move up

      • Place a metallic object underneath the Pinda probe. The red light on the probe should turn off

      • If this test fails, do not attempt to print or use your printer. Carefully verify the wiring of your PINDA

      • The recent Prusa firmware allows you to check the value of the Pinda probe via the LCD menu Support -> Sensor info

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      • From the printer's menu Settings -> Temperature -> Nozzle, set the nozzle temperature to 80°C

      • Return to the info screen (main screen)

      • Verify that the hotend fan is starting as soon as the temperature exceeds 50°C

      • Let the hotend cool down using the printer's menu Preheat -> Cooldown

      • If this test fails, do not attempt to print or use your printer. Carefully verify carefully the wiring of your hotend

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      • From the printer's menu Settings -> Temperature -> Fan speed, set the fan speed to 130.

      • The nozzle fan (front fan) should now rotate at half speed.

      • If this test fails, do not attempt to print or use your printer. Carefully verify the wiring of your nozzle fan.

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    9. 5. Software configuration, Configure PrusaSlicer: crwdns2935265:08crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 5. Software configuration, Configure PrusaSlicer: crwdns2935265:08crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

      • Open PrusaSlicer, go to Printer Settings -> General -> Size and coordinates, then click on the Set ... button

      • On the Bed Shape window, set the X size to 240

      • And Y size to 205

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    10. 5. Software configuration, Update PrusaSlicer profiles: crwdns2935265:09crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

      • In PrusaSlicer, go to Printer Settings -> Extruder 1 and reduce the retraction length to 0.5mm for PETG and 0.3mm for PLA

      • These values are only a starting point and you will need to adjust them later according to your tuning

      • The Hemera has a much shorter filament path and efficient cooling tha original Prusa extruder. If your retraction is too long you might clog the Hemera

      • This setting might be overridden by your filament settings, make sure to check them

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      • With the BearMera, the bed calibration and self test will fail and should not be executed.

      • Bed calibration fails because of the geometry of the extruder. The Pinda and the nozzle have different positions.

      • The self test will fail because of the E3D fan which does not have the rotation sensor. It will also fail because of the bed calibration.

      • The bed calibration could potentially crash the nozzle which would damage the bed surface.

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      • Calibrate your first layer with the printer's menu Calibration -> First layer calibration.

      • The first layer calibration will remove the following message that could appears when you power on the printer: "Distance between tip of the nozzle and the bed surface has not been set yet. Please follow the manual, chapter First steps, section First layer calibration.".

      • It is possible that with the weight of the Hemera, the X axis is moving down on one side when the printer is off for some time. If this happens, move the X up until it crashes as explained in this step. Note that his can also happen to stock Prusa printer (and so stock Prusa extruder)

      • After calibrating your first layer, we recommend to set your extrusion multiplier according to our guide here: Extrusion multiplier and filament diameter

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      • Congratulations, you have finished to install and calibrate your BearMera extruder.

      • Happy printing :)

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Bear Lab Upgrades

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