With an Ender 3 V2, running a prebuilt nightly from marlin.crc.id.au, Arc Welder is reporting that the firmware is not supported. Is this because the firmware version is being reported as bugfix-2.0.x rather than 2.0.6 or later? It is also reporting "3D-Arcs Supported:Unknown".
As the error message says, you can't tell what version of firmware it is because it is just labelled 'bugfix-2.0.x' rather than an actual version number.
//
// G2/G3 Arc Support
//
#define ARC_SUPPORT // Disable this feature to save ~3226 bytes
#if ENABLED(ARC_SUPPORT)
#define MM_PER_ARC_SEGMENT 1 // (mm) Length (or minimum length) of each arc segment
//#define ARC_SEGMENTS_PER_R 1 // Max segment length, MM_PER = Min
#define MIN_ARC_SEGMENTS 24 // Minimum number of segments in a complete circle
//#define ARC_SEGMENTS_PER_SEC 50 // Use feedrate to choose segment length (with MM_PER_ARC_SEGMENT as the minimum)
#define N_ARC_CORRECTION 25 // Number of interpolated segments between corrections
//#define ARC_P_CIRCLES // Enable the 'P' parameter to specify complete circles
//#define CNC_WORKSPACE_PLANES // Allow G2/G3 to operate in XY, ZX, or YZ planes
//#define SF_ARC_FIX // Enable only if using SkeinForge with "Arc Point" fillet procedure
#endif
Ah! Just the answer I was looking for with regards to getting Arc Welder to work properly. It was generating code, but the results were spaghetti... Thanks Ewald!!
Is there a guide on which settings in the firmware are best for Arc Welder? Gonna go with the defaults for now, but I'm always on the quest for better prints.