I have had a ticket open with sales to purchase a list of parts for quite some time (~1 month), and it seems they either cannot help me or do not want my business.
In all honesty, most likely some of the parts you want to buy are critical parts for our production line.
(I'm guessing the display, electronics, head-parts)
Anyhow, you can control the printer fine with a normal RAMPs board with basic marlin on it. You won't have the fancy OLED display. So you should look at it more as an UM-Origonal from the control side.
The Ultimaker2Marlin fork is mostly a fork for the OLED display and menus on there. (The changes for the motor current levels have actually been merged into main Marlin already)
Which electronics is supported by Marlin can be checked here: https://github.com/ErikZalm/Marlin/blob/Marlin_v1/Marlin/Configuration.h
You will have to compile your own configuration. Maybe you could use the Marlin Builder: http://marlinbuilder.robotfuzz.com/
There are a few UM2-specific commands in Ultimaker2Marlin such as adjustment of the stepper current which you will not be able to use. However, some UM2 originated commands like the firmware retraction commands G10 and G11 have been also implemented in standard Marlin in the meantime.
From the software (e.g. Cura) you will have to run your printer as an UM Original (RepRap flavor). The printing performance should not be affected. It depends on other things like which hotend you use (I guess you will not have the UM2 hotend).
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