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You are probably right about the idler clearance for the 1.75mm version. I haven't actually tried the 1.75mm myself to check clearances as I run 3mm filament. If there isn't enough clearance I'll just shaft some material off of the side of the extruder to allow the idler bearing to extend far enough into the extruder. If I get a chance this morning I'll make that change and upload the modified .prt and .stl files.