If you have a new dreamer with the 4mm OD 2mm ID Teflon tubes in your print heads/nozzles then save a ton a cash by buying the tubing from Amazon ($5.10 for 1 meter) and cut it to the perfect lengths by using this jig and a razor blade. Better than $2.25 for 30mm plus shipping!! Simply flip this jig over so the cut away faces down on the table. Now slide your meter of tubing into the tunnel and use a fresh razor blade to cut them off flush with end of the jig. Compare with one of your current replacement tubes and you should have to sand the cutting end a little to make it perfectly flat and even with your old stock of tubes.