A Better PTFE Bowden Tube Cutter (cack-handed edition)

Remix that extends the flat area around the cut, and includes a 10 degree shim for aligning the hone of the blade.
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updated June 22, 2022

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This is only necessary for people who cannot hold a blade steadily at a 10 degree angle when performing a cut. If you can do that, or you don't mind your tubes being cut slightly off flat, then just use the original cutter.

Like almost all hobby knife blades, Excel #11 x-acto blades have a hone/grind on each side of the blade. So, to make a very flat cut, we want to align one of the honed flat surfaces with the flat of the part that holds the PTFE tubing. I think there is a very small secondary hone on the Excel blades but I was unable to measure it, so I'm trying to align the flat of the larger hone with the flat of the cutting surface.

I measured the hone at 10 degrees (10 degrees on each side). I made a small triangular shim that allows me to lay the larger flat surface of the blade on the shim, and results in the flat surface of the hone being level with the work surface (see photos).

I simply glued the blade with superglue (at the top edge) to the shim, after resting the blade lightly on the shim in the perfect position, and allowed the glue time to set. Now I can align the bottom of the shim with the top of the cutter and create a perfect flat cut. I enlarged the cutting surface of the cutter so I can move the blade/shim part around more easily.

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