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Yeah.. managed to get my homebrew CNC machine up and running so I am planning on milling an aluminum all in one openrail gantry and titan aero mount... if I still have issues at that point I can pretty much guarantee it's the wheels. I like the idea of a test rig.. maybe something as simple as securely attaching a mechanical pencil or awl to the hot end and scratching/drawing a line on something. At least then you're eliminating anything going on with the extruder and filament. From my experience even if the wheels are good to begin with they don't always stay that way or you can still have problem with good wheels if the pressure on the rail is not adjusted correctly.