Rather than rewrite what has already been written. Please read over the instructions described in step 14 of the build and calibration manual. http://gcreate.com/downloads/gmax-1-5-build-and-calibration-manual-1-2/
Things to keep in mind:
1. The bed of the gMax is secured by 4 points. If all 4 points are not held on the same plane, the bed will be slightly skew. An extreme example of this is shown in the picture below.
2. Adjustments to the right side of the bed will affect the far left side of the bed and vice versa.
3. The bed is not perfectly flat. To account for this slight deviation print with a large first layer. Typically 80-90% of the nozzle diameter is a good choice. The larger your first layer the easier it is to achieve an acceptable tolerance.
4. Remember to keep the springs tightly compressed to prevent them from vibrating loose during operation.
Getting better bed adhesion:
1. Print the first layer at half speed.
2. Print the first layer at thicker layer height – pretty much as thick as you can go.
3. Use a raft or a large brim.
4. Make sure the bed is sanded really well.
5. A higher first layer temperature will increase bed adhesion.
Inside the attached zip file are good test prints for bed alignment. If you are able to pull off these prints, your bed is aligned. This is the procedure I use when using this test print to dial in my alignment.
1. After I start the print. I keep a very close eye on the plastic being extruded onto the bed. You should be able to tell if the bed is too high or low just by watching.
2. Test the bed adhesion by tapping the line of extruded plastic with your fingernail. It should not come off easily.
2. After the printer has laid down a line on all 4 sides and an X in the middle. Stop the print.
3. Take note of the bed adhesion is various places. Write it down.
4. Make a few small adjustments as needed. Write them down as well.
5. Restart the print.
After a few iterations of this procedure, Your bed should be very well aligned. The outcome obviously is dependent on you making smart adjustments.
You can use a low grit sand paper (40-80) to sand down high spots in the bed. Use water to help control the dust generated by sanding.
If you want to switch to a glass bed I recommend 1/8" glass. Glass maintains a consistently flat surface better then acrylic. However the bed adhesion with sanded acrylic is much better than blue tape or glass.
Please share your experiences with bed leveling.
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