> I'd suspect that, e.g., an inkjet printer probably won't print small 
> barcodes with sufficient accuracy.)

You can buy parcel shipping online here in Germany, and you get a label to 
print out with the barcode on.  This is then scanned by the machine at the 
unmanned drop-off point.  Once my inkjet had a blocked nozzle and I was 
there for 10 minutes trying to get the damn thing to scan.  Then I realised 
what the problem was, got a black pen and filled in the bar that had a bit 
missing by hand - it worked!

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