PTFE tube size in hotend
Correct me if I'm wrong, but the tube inside the hotend has a 1.9mm internal diameter, yes? I was unblocking my hotend today and noticed that the filament had a blob on the end which was stuck in a 2mm bowden tube but didn't get stuck inside the hotend tube (don't ask my why I decided to check this - call it idle curiosity). This seems odd. I checked it visually and it did look a little bigger than the bowden tube. Taking my calipers to it, I measured my 2mm tube as 2.02mm and the hotend tube at 2.10mm. This seems wrong, unless I'm missing something (I wasn't measuring the chamfered end which obviously would be bigger). I've switched it to a 1.8mm piece to see what happens (I don't have any 1.9mm to hand).
Re: PTFE tube size in hotend
1.9mm in the multimedia cold end,
nominal 2mm in the single extruder versions
mind you, I had a 2.2mm blob in my mmu,,, it was difficult to pulll out
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
Re: PTFE tube size in hotend
1.9mm in the multimedia cold end,
nominal 2mm in the single extruder versions
mind you, I had a 2.2mm blob in my mmu,,, it was difficult to pulll out
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
Re: PTFE tube size in hotend
Weird. I have a filament which measures 2.1mm and it happily goes though the hotend tube (MM edition) but won't go though any of my 2mm bowden tube. Maybe the hotend tube is deformed in some way?
Re: PTFE tube size in hotend
I think there are 2 thinks happening here.
1. The extruder PTFE is very short; the motors just about have sufficient torque and the flexing of the filament within the Bowdens allow the filament to push through.
2. Wear on the extruder PTFE (which I have mentioned previously). Being the primary tip-former and also being very soft, it does wear (note that it should be tapered internally both ends - but that will depend on who made it and when).
Peter
Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…
Re: PTFE tube size in hotend
Hi,
Does anybody of you perhaps have a recommendation for a shop in europe where i can buy good quality ptfe tubes? In 2mm for the bowden to the extruder and perhaps the 1.9mm one?
I havent seen it on the prusa page and the shipping charged are too high....
Rgds
Re: PTFE tube size in hotend
Hi folks,
I have another question for the PTFE hot end part: what is the OD (outside diameter) ?
As I read, internal diameter seems to be 2.00 mm for MK3 single extruder...
Maybe you can buy PTFE tube in Europe (...Switzerland) at this technical shop: https://shop.maagtechnic.ch
Thanks for you advice,
Ludovic
Re: PTFE tube size in hotend
I'll add that the PTFE wears quickly as well. I replaced mine after noticing that it was clearly deformed. I posted a few photos in another thread. I checked it again after 5 or 6 prints and it was clearly already deformed (wider) at the top. I didn't check the bottom but presumably it is the same.