He did become a social democrat and supporter of FDR later in life.

volatile organic compounds

Perfume and air fresheners are VOCs, you need to know specifically what ones.

PLA is used for medical implants, because it breaks down into lactic acid inside the body, so it’s almost certainly safe.

And macroplastics

I assumed you meant TRT.

They have a method of aligning it using machine vision https://jubilee3d.com/index.php?title=TAMV

The belt part would be a challenge though.

Personally I like the Jubilee tool-changing system, where multiple extruders are mounted on a rack and swapped between as needed. It’s what I plan to build at some point

Personally I stopped using printables after they allowed proprietary designs.

Vitamins is a reprap term for non 3d printed parts, screws, motors, etc.

From the instructions it looks like it uses pronterface https://raw.githubusercontent.com/nophead/Mendel90/master/dibond/manual/Mendel90_Dibond.pdf

To add, if it’s using the Melzi board that some used, then you should be able to load g-code onto it using the micro SD card slot. It will depend on the firmware if it can recognise modern gcode though. You may be able to compile a modern version of marlin for it too.

There’s some info about it here https://reprap.org/wiki/Mendel90

This is a very old printer, from the early days of reprap. From a practical standpoint you would get better results from the cheapest new ender i3, and it would be a lot easier.

If you want an interesting project though it should be entirely possible to get it working, and you’ll learn a lot from it. If it’s still using the original Sanguinololu controller board that will be your biggest issue, as I doubt a modern version of the marlin firmware will fit in a ATmega644P. Your best bet would be to replace the controller board with something modern, then you can use it as any modern 3d printer.

It’s very flat, it works well with PLA, and it’s what my ultimaker 2 came with.

Same with glass, I ruined a few with PETG.

Friends don’t let friends buy proprietary cloud locked printers.