¶ Fault Phenomenon:
The heated bed wobbles and cannot be tightened.
¶ Fault Cause:
- The two Y-axis aluminum profiles are not parallel.
- The POM wheels are not adjusted for tightness.
- The screws securing the POM wheels are loose.
¶ Tools Required for Troubleshooting:
- 2.0mm screwdriver
- Wrench
¶ Troubleshooting Steps:
¶ 1. Check whether the two Y-axis aluminum profiles are parallel.
Use a ruler to measure the front-to-back distance between the two Y-axis aluminum profiles. Under normal conditions, the straight-line distances marked in the same color should be equal. If not, the two Y-axes are not parallel.
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- If the two Y-axis aluminum profiles are not parallel, proceed to Step 3 for further troubleshooting.
- If the two Y-axis aluminum profiles are parallel, proceed to Step 2 for further troubleshooting.
¶ 2. Tighten the Y POM wheels.
The eccentric nuts under the heated bed are adjustable. Use a wrench to turn each about 1/3 of a turn at a time. Multiple adjustments may be needed. Typically, one of the six POM wheels may remain loose. This could also be due to component tolerance or assembly errors, which will not affect printer use or print quality.
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¶ 3. Adjust the position of the two Y-profiles to ensure they are parallel.
a. Turn off the printer power switch and unplug the power cord.
b. Use a 4.0mm hex screwdriver to loosen the eight screws shown below.
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c. Use a 2.0mm/3.0mm hex screwdriver to remove the screws in the positions shown below, and remove the Y-axis rear cover.
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d. Remove the drawer.
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e. Unplug the touchscreen connector and remove the touchscreen.
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f. Use a 2.0mm hex screwdriver to remove the screws securing the bottom cover.
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g. Slowly open the bottom cover, unplug the mainboard fan adapter cable, and remove the bottom cover.
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h. Remove the four screws securing the mainboard.
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r. Gently move the mainboard aside, and use a 2.0mm/3.0mm hex screwdriver to loosen the eight screws securing the Y-axis aluminum profiles.
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j. Adjust the spacing between the two Y-axis aluminum profiles to ensure they are parallel. The distances at the same color markings should be equal.
¶ 4. Check whether the screws securing the POM wheels are loose
a. Turn off the printer power switch and unplug the power cord.
b. Unplug the Y-axis accelerometer connector.
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c. Use a 2.0mm/3.0mm hex screwdriver to remove the screws in the positions shown below, and remove the Y-axis rear cover.
d. Remove the six wheels.
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e. Remove the PEI sheet.
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f. Use a 3.0mm hex screwdriver to remove the two screws securing the Y-belt bracket.
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g. Flip open the heated bed and remove the six springs.
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h. Push the slider plate out in the corresponding direction.
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r. Use a wrench to hold the nut in place, and use a 3.0mm hex screwdriver to tighten the screws securing the POM wheels.
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!
If, after completing steps 1–4, more than two POM wheels remain loose and cannot be tightened, the slider plate is likely deformed and needs to be replaced.