ok so I have seen lot of issues caused by the bowden tube coming from the factory not being cut straight and people in general having issues cutting it straight so I did a search and found a few on here that where ok but I wanted more options so I designed this one up it uses a standard razor blade... the main arm is held in by an M3 bolt... 8-10mm should work fine I did not plan on using a nut because I figured there is no need. The blade is held in by 2 m2 bolts and nuts... I think I used 6 or 8mm with a nut... then I also added a place to use the spring out of a bic pen to lift the blade up now this does not have a way to hold the blade down when not in use so keep out of the reach of small kids...
works great printed several now.
Added a flat base as well if you want to use the design to cut other stuff.
remember to check out my wed site/ FaceBook group and pateons page