can gsender use stl files
The name “gSender” is abbreviated from the words gcode sender.
You need a program in between one that creates stl files and gSender.
That program creates the gcode that gSender sends to your machine.
That program could be one of several toolpath design programs.
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@foxer Welcome to the group, Harry. I’m sure that you will find it an excellent source of help and advice.
I have nothing to add to what @CrookedWoodTex has told you, so I will shut up for a change. 