The old, brittle plastic margin markers on my Olympia SG-1 broke. Needed new ones, so I modeled these out. They fit and work, but are very thin. If you are printing in resin, be sure to mix in a good amount of flex resin, or you'll probably just break them. I filled in the intented markers using a red Sakura Pigma Micron PN pen. It is not opaque like the original, but it stays on the plastic and is visible enough to see where your margins are. I printed them flat on the bed, because trying to cut off supports broke them for me (but that was before I mixed in enough flex resin.)
The author marked this model as their own original creation.