It’s a classic problem with the Moai 130 and 200. I have been working on getting them more mechanically accurate and just dialed my 130 in to about a quarter mm of accuracy.
This series of printer uses a Galvo to move a laser spot to different parts of the vat. I’m sure you realize this already, but this is one of its faults as the area can warp slightly from the center spot to the outer edges. Long of the short, you get dimensional variations in those areas. We’re still talking fractions of 1mm, but for some that is a huge variation.
With that put on the side, everything else is just like most other printers. If you have experience with FDM printing, just adopt this with the same mentality. Laser speed and laser power are the same as the print speed and nozzle temperature. No bed heating, but there is a heater for resin heating to make it more viscous. Other than that, line by line and layer by layer it has the exact same principle as FDM printing.
With that in mind, you can use Cura. The default settings are great and work very well. Most often all you would have to do is just adjust laser power so that it doesn’t over cure the resin. Just do the ring test after you lower the laser power by one point until the print has a pancake on the build plate, and one in the vat. This means that the laser is too low, and increase it by one point and that’s your sweet spot.
I made this file in Meshmixer (wasn’t hard to do) but you can use it to calibrate the X/Y dimensionality of the printer overall.
There is an attached video done by me as I awkwardly try to explain how it works.
For the Moai 130, and mostly the 200 too, there are two settings in the menu X Size and Y Size that can be adjusted to refine the dimensional accuracy of the X/Y galvos.
With all that said, and once you learn how to do supports, the machine works great. Lasts a long time, and can print some of the best resins I have ever used. I want to breathe life into it as it works so well and want others to enjoy it as much as I do. I’m also looking to buy a used 200 for these purposes as well and need one to print things that the 130 is just too small for.