3mm and 1.75mm 3D printers are incompatible – but it’s pretty easy to convert to the more modern 1.75mm standard!
Hackaday article (worth a read)
Guide: Convert your 3D printer from 3mm to 1.75mm filament!
3mm to 1.75mm Conversion
3mm to 1.75mm Conversion
3mm and 1.75mm 3D printers are incompatible – but it’s pretty easy to convert to the more modern 1.75mm standard!
Hackaday article (worth a read)