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Leveling the R2 Print Bed

Discussion in 'Troubleshooting' started by tkoco, Jul 30, 2019.

  1. tkoco

    tkoco Active Member

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    Leveling the R2 print bed is different from leveling the C2 print bed. In the C2, the print bed is a fixed structure and needs shimming to properly level the bed. With the R2, the print bed comes with 4 height adjustment screws thus eliminating the need to shim the print bed. Additionally, the wizard section of the software comes with an additional wizard to assist you with the bed leveling.

    Conventions:
    • Make sure the tip of the nozzle is clean of filament
    1. Direction of turning the adjustment knurl nuts is based on looking up at the bottom of the print bed from the base of the printer.
    2. CW rotation lowers the print bed with respect to the hot-end nozzle.
    3. CCW rotation raises the print bed toward the hot-end nozzle.
    • From the front of the printer:
    1. CW for a right handed person, the thumb [on the left side of the knurl nut] moves left to right. The index finger moves right to left (behind the knurl nut). For a left handed person, the opposite is true (the thumb [on the right side of the knurl nut] moves right to left behind the knurl nut), etc..
    2. CCW , each motion is reversed for the respective "handedness".
    Preliminary set up of the print bed:
    1. Turn on the R2 printer.
    2. Tap the Motion Control button and then the Raise Z button
    3. Gently turn all four knurl nuts CW until the nut stops (i.e no more adjustment)
    4. Turning CCW, back off the 4 knurl nuts; five each 1/2 turns for a rough total of 2.5 turns. No need to be super precise as you will be adjusting the print bed later on to a precise level.
    5. Tap the Home button and then return.
    Setting the initial Z Offset of the Print Bed:
    1. Using an ordinary 20 weight sheet of white printer paper, cut a 6 inch by 3 inch (about 150mm by 75 mm) piece of paper. This piece will be your height gauge (0.1mm thick).
    2. Tap the Wizards button and then the Z Offset button.
    3. Tap the distance button and set it to 0.2mm.
    4. Place the height gauge under the nozzle. Assuming you have a factory default R2 printer, shine a flashlight (torch in the UK) on the gap between the nozzle and the height gauge. Pay attention to the gap distance.
    5. Tap the Z+ button and raise the print bed. Repeat until it looks like the nozzle might touch the height gauge. See image below.
    hotend.jpg

    Next:
    1. Tap the distance button until it reads 0.05mm
    2. Slice the height gauge under the nozzle and then remove from under the nozzle.
    3. Tap the Z+ button.
    You are looking for a height where tapping the Z+ button and sliding the height gauge under the nozzle gives you resistance. When you tap the Z- button and slide the gauge, you feel no resistance. When you reach this point, tap the Z+ button to get resistance and then save it by tapping the Done button.

    Bed Calibration:
    • In the Wizards panel, select the Bed Calibration wizard and then the Manual mode by tapping the respective button.
    • You will be presented with four positions: Front Left, Front Right, Back Left and Back Right. Select the Front Left as it is closest to the position used by the Z Offset wizard.
      • Attempt to slide the height gauge between the nozzle and the print bed. Adjust the print bed height using the respective knurl nut [Up CCW or Down CW].
    • When you have the height adjusted correctly, select the Front Right position by tapping the button. Repeat the same procedure of adjusting the knurl nut to raise or lower the print bed until the resistance gap is correct.
      • Attempt to slide the height gauge between the nozzle and the print bed. Adjust the print bed height using the respective knurl nut [Up CCW or Down CW].
    • When you have the height correct, select the Back Left position by tapping the button. Repeat the same procedure of adjusting the knurl nut to raise or lower the print bed until the resistance gap is correct.
      • Attempt to slide the height gauge between the nozzle and the print bed. Adjust the print bed height using the respective knurl nut [Up CCW or Down CW].
    • When you have the height correct, select the Back Right position by tapping the button. Repeat the same procedure of adjusting the knurl nut to raise or lower the print bed until the resistance gap is correct.
      • Attempt to slide the height gauge between the nozzle and the print bed. Adjust the print bed height using the respective knurl nut [Up CCW or Down CW].
    At this point, you have roughed in the print bed level. When each position is adjusted, that knurl nut adjustment affects the other 3 positions. So! Go back to the Front Left position and repeat the knurl nut adjustments for each position as listed above.

    As you complete each round of adjustment for all four positions, you will find that the amount of adjustment of the knurl nut will be less than the previous round. A point will be reached where you will not need to adjust the knurl nuts (around 4 to 5 passes).

    At this point, exit the wizard.

    Fine Tuning Offset adjustment:

    Load up some PLA filament using the Load Filament wizard. Adjust the 190 degree temperature setting so that the print bed is heated to 40 degrees C. Save it and then select that temperature.

    With filament loaded, select the Fine Tune Offset wizard and use the modified PLA setting. If you do not have a digital micrometer, pay attention to the instructions page. Set the height adjustment to 0.01mm by tapping the distance button.

    Tap the Test Offset button and lay down a line of filament. Tap the Options icon ( 3 bars in upper right corner) and tap the Switch to other corner option. Then tap the Test Offset button again.

    Using the Options icon, select Clear Bed and remove the strips. Return and repeat as the hot-end may not have been primed for the first pass.

    For the second (or further rounds) compare the left strip to the right strip. They should be reasonably identical. If you have a digital micrometer, measure the thickness of the strips. Again, you are looking for uniformity.

    Raise (or lower) the print bed to get a strip of a appropriate thickness (around 0.3 to 0.4 mm thick). Remember to tap the Test Offset button after every height adjustment.

    When you are satisfied with the height adjustment, tap the Options icon and select Switch to circles. Tap the Test Offset 6 to 8 times to print some concentric circles.

    circle.jpg

    The filaments should be uniform.

    Finally, tap the Options icon and then the Save and exit option.
     
  2. tkoco

    tkoco Active Member

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    As a follow up to this article, If you lack a digital micrometer and need a quick height check on the filament strips as you print them, make an inexpensive height gauge checker. Pull the filament strip very near the paper. The strip should slide without resistance. See the image below. Press down on the ruler to insure that it is parallel to the clipboard.

    height_measuring_gage.jpg
     

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