Hi Moai users,
With feedbacks from multiple users, we have drafted a new way to check leveling so it is less subjective and second-guessing. This has not made into the official Wiki yet, and we are looking for feedback from the community on this.
Updates to leveling process:
Leveling is the number 1 reason why print does not come out correctly, and we have been testing ways to make leveling less subjective.
Here is the additional step we are going to insert into leveling:
After the nuts are tightening and z-reset position is set to 1877. Please print following corner test g-code:
This GCode prints four cylinders with a total height of 11mm. There is lettering on top of each cylinder, identify its position on the platform:
This GCode takes about 15 minutes to print at default system settings with a laser power of 58. Please make sure room temperature is above 20C.
When the four cylinders are done. It should look like:
After cleaning it in with Ethanol or IPA, you can check the total length with a caliper.
And you can do this for four corners. Since the amount of compression on heights is a good indicator how much pressure the build plate is putting on the PDMS layer. This set of numbers gives us a good idea about leveling in each corner.
The ideal plate pressure would lead to cylinders with 10.7-11mm height. If it is over 11mm, you may find your print not sticking well and require extra laser power to keep it on. And if it is under 10.5mm, you may find your PDMS layer is wearing out quickly. In some cases, too much pressure on PDMS cause artifacts and shifted layers.
Now you have the leveling indicator number for each corner, how can you get them to into the preferred range.
The numbers are close. Let’s say 10.45, 10.51, 10.42, 10.49. This shows the plate is relatively parallel to the PDMS layer; only the height needs to be adjusted. In this case, you can add 0.4mm to each corner’s height by reducing Z Reset Position by 4. This should get all four corners into 10.8 range. So if you are on 1877, you can lower it to 1873 and test print again
If the cylinder height numbers are pretty far apart, say 10.65. 10.85. 11.00, 11.15. You may want to just do the leveling process again to get them close to each before taking step 1.
If you have three height numbers pretty close, but one is far. Say 10.49. 10.69 10.73. 10.75. Instead of completely relevel, you could just modify the problem corner. Tightening the nut half turn will increase cylinder by about 0.3mm while loosening the nut by half turn adds about 0.3mm.
So in this case, you tighten the nuts for the 10.49 corner by half turn (matching the letter on the cylinder) and then reduce z-reset position by 1 to get everyone in the 10.8 range.
If you have any corners failed, check for damages on that corner’s PDMS and make sure system settings match to the recommended level. If the setting is ok and there are no damages, it is recommended you redo leveling before printing again. The plate press on the failed corner is too lower.