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Glad you got this sorted. I've made a few STM32 blue pill controllers, but the memory is a bit small and Onstepx won’t run on it. The better, easier version is the Fysetc E4 as it’s mostly plug n play, uses a 32 bit board (allowing faster sewing), with minimal configuration required. It costs only $20-30 more for a lot less time a few dollars more when all the bits are added up bit will save a lot of time and energy overall. I recommend adding the RTC module too as it keeps excellent time and, if you don't relocate your scope often, makes setup quick without the need to pfaff about with entering date and time every time you start up.
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