Elegoo Mars Fix for missing layers

These files are the result of me trying out the ideas on Alex Whittemore's and Jan Mrázek's blog posts on some design flaws in the Eleegoo Mars DLP printer. The Mars, while a super fun machine for the price, has too much play on the threaded rod inside the stepper motor housing. This leads to missing layers of up to 1.4-1.5mm height, most noticably when printing layers with larger horizontal crossections due to the drag on the Z axis. The solution is to add an extra spacer in the motor housing and replace the rubber damper with a solid plastic mounting block. Please read

https://blog.honzamrazek.cz/2019/09/testing-the-precision-of-elegoo-mars-volume-5-whats-wrong-with-the-z-axis-and-how-to-fix-it-finally/

https://www.alexwhittemore.com/troubleshooting-the-elegoo-mars-z-accuracy-squished-first-layers

for all the details.

Fun fact: The Mars, as many other budget DLP printers, has a slight halo effect, leading to about 0.1-0.2mm overexposure on the edges in XY direction. You