So you will normally have 11000 bytes for additional features (see detailed list below). This is true if the optiboot bootloader is installed. Actual byte sizes may change with newer versions of Marlin or newer compilers so take them as approximations.Ĭurrent investigations show that the minimum size of Marlin 2.0 on an 8Bit AVR like on the Ender 3 (ATMega1284p based CPU) is around 119408 bytes from 130048 bytes of maximum available space (if you keep SDSUPPORT enabled). Newer versions of Marlin firmware have evironment settings called "melzi_optimized", which contain already the above mentioned optimizations so you don't have to make them yourself.Įach line shows how much memory is needed to compile the feature. Then you can do further optimizations as described here below. In general, the firmware can be shrinked by a good amount (~5%) by just adding some compiler directives in your platformio.ini file to start with as in this article. Sometimes each byte can make a difference whether you may be able to build the firmware or not. This is a list of optional features or candidates to enable/disable to free up memory in Marlin 2.0 for 8Bit AVR boards.
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