PTFE tube replacement drill bit?
Hi everyone, I've had some issues with my printer clogging and such, while changing out the PTFE tube I ended up breaking the one I had so i need to replace it, I already have some PTFE available but reading the directions it says to use a countersink drill bit on one of the ends
but I have looked all over to find said drill bit and have come up empty handed, any help as to what bit to get would be greatly appreciated!
RE: PTFE tube replacement drill bit?
E3D recommends cutting the PTFE off square - no need to route out a camfer.
But - if you want to duplicate the Prusa trimmed ends,
https://www.amazon.com/IRWIN-Tools-Countersink-5-Piece-1877791/dp/B00LLGSZGS
RE: PTFE tube replacement drill bit?
@tim-2
ah okay that makes more sense
is there any benefit to using Prusas method over just cutting it square?
RE: PTFE tube replacement drill bit?
@doofy
Not sure. The Prusa method eliminates a place where filament residuals can collect and theoretically bind the filament path and may improve filament loading just under the Bondtecg gears (probably improves need for tight alignment accuracy). And, Prusa has done weird things to the hot end to improve MMU reliability.
Since E3D makes the V6 - pretty sure they'd be doing the same if it were really necessary.
RE: PTFE tube replacement drill bit?
A very experienced MK3S user has made a cute little tool for that:
https://www.prusaprinters.org/prints/34035-ptfe-multitool
It uses for the outer chamfers 2 blades of a cheap pencil sharpener (aligned for cutting angle 90 and 120 degree respectively).
For the inner chamfers it uses this type of drill:
https://www.hoffmann-group.com/DE/de/hom/Monozerspanung/HSS-Bohrer/Zentrierbohrer-HSS-A-unbeschichtet/p/111005-2?wayIntoCart=PDP&tId=672
I do not know where to get it in your country.
I used that tool recently. Nice.
In case of emergency you might make an interior chamfer using carefully some old fashioned household scissors having somewhat pointed ends so that it gets into the tube.
Have a nice day.
PTFE tube countersink
This type of countersink will give you the smoothest chamfer on your PTFE tube.