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You will need the following tools:
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PTFE cutting jig. If you are building the Bear extruder use the one included with the printed parts. If you are cutting a PTFE tube for another extruder, check our files here: thingiverse.com/thing:3749528
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Box cutter with a blade thickness of approximately 0.4 mm. Verify that the blade can be fully inserted in each of the jig's slits.
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60° countersink.
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Unused PTFE tube of at least 100mm.
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First image is an example of standard 60° countersink:
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The outer diameter must be in the range of 4.5 to 6.5mm.
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The second image is an example of center drill bit which is generally at 60°:
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The outer diameter must be in the range of 4.5 to 6.5mm.
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The diameter at the end must be less than or equal to 1.5mm.
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The third image is an example of a 60° CNC milling cutter:
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The outer diameter needs to be in the range of 4.5 to 6.5mm.
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Make sure your PTFE tube has a flat and perpendicular end. If this is not the case, use the end (number 3) of the PTFE cutter jig to make it straight.
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Insert the box cutter blade in the PTFE cutter jig in the slit number 1.
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Verify that the blade is at the bottom of the slit and parallel to bottom of the jig.
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In order to protect your fingers, make sure the blade is fully inserted as seen in the image.
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Hold the blade in the PTFE cutter jig with your thumb.
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Insert the PTFE tube all the way in the cutter jig until it is pressed against the end stop.
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Rotate the tube clockwise (looking from the back of the cutter jig) to chamfer the end.
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Rotate few turns. It should create nice chips of PTFE.
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Use a longer PTFE tube
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Add a filament inside the PTFE
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Use a kitchen glove
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Remove the blade from slit number 1.
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Insert the blade in slit number 2.
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Verify that the blade is at the bottom of the slit and parallel to the bottom.
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To protect your fingers, make sure the blade is fully inserted (refer to previous steps in case of doubt).
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While holding the blade with your thumb, insert the PTFE tube all the way in the cutter jig until it is pressed against the end stop.
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This time you need to rotate the tube counter-clockwise (looking from the back of the cutter jig).
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Keep the PTFE inside the jig and trim the length. Make sure the PTFE is fully seated and does not move while making the cut.
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On the flat side of the PTFE, make a chamfer with the 60° countersink tool.
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The completed chamfer should look like the second image.
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Pass a piece of filament through the trimmed PTFE tube to clean any residual PTFE chips.
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