Extruder PTFE tube restrain mount
Description
A mount made from TPU or TPE (flexible filament is key) that will allow you to add extra restrains to the PTFE/Bowden tube. Requires thin zip tie. Suggest the use to thread locker for added resistance as you only want to tighten the zip ties so much. Too tight and you will add drag to the filament inside. I came up with this idea as my Ender 5 Plus came with the extruder facing up. This puts the tube in a position to rotate more from the movement of the x,y back and forth. So after awhile, even though you may have a good pneumatic fitting with good metal teeth, you will saw the tube and push it out. Which is what happen to me. My tube was sawed at the section of the teeth in the pneumatic fitting. Since I have done this mount and changed the orientation of extruder my tubes have been fine for months of constant printing. Take note to remove ALL supports after print. At it current print there is plenty of room for the standard screws that come with the extruder and motor to add the mount and screw in. If you leave the mesh of the support still on the part then you will have your mount screw head too high for the tension screw to screw in. Also if you don't take the supports out from the zip tie holes then you will tare the mount when trying to push a zip tie in. There are three versions. One for the basic extruder, one with minimum material in case you have a setup that needs less, and a final one that has much more support and is what I suggest. All were printed on an ender 3 with direct drive at 20ms 215/60 at .2 with a .4 nozzle. Of course with your filament you will have to adjust for your setup as I have other tpu that I can print at higher temps and much faster. EDIT. I am adding a V2 edition where it is slightly further from the Pneumatic Fitting as I have come across some that are slightly longer. I have also changed the amount of zip ties and base thickness to increase strength. If printed horizontal this would make that layer weak with so many zip ties. Really only one zip tie is needed when using a tiny amount of glue or (what I use) threadlocker blue. One suggestion I would make is to use some heat on zip tie area to melt the tpu together, again for strength. If you look at updated photos that use only one zip tie you can see I used a soldering iron to slightly melt the tpu around the zip tie area. These have worked great since this changed for months now does many many MANY long prints that last for 7+days. I can see how my new fittings failed, but the extruder tpu restrainer keeps the tube in place even with a failed fitting.
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