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Keywords arithmetic in Cura

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I'm aware of the availability of keywords that can be used in G-code that are parsed by Ultimaker Cura on compiling the G-code file.


I'm missing a good reference how you can do some basic arithmetic to parse a formula to a value rather than an in-place substitution. E.g. in Slic3r you can use some complex arithmetic and conditional statements to define custom values.


In defining a certain speed (in mm/min) based on a travel speed (in mm/sec) in end or start G-code one might to use something like:


G1 X0 F{speed_travel}*60*0.75


How would you implement this in e.g. an Ultimaker Cura "end G-code" to expand to G1 X0 F5400 (for 120 mm/sec travel speed that is)


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