I’v been searching for a week now and I can’t find the tube for the extruder and injection machine….
I know someone sells them at the pp-bazar, but I want to find it cheaper.
Does anyone have tips?
It’s nearly impossible to find in my experience. I am in the US so all of the metric parts have proven difficult. (stupid imperial system).
There is 35/25/5mm hollo bar that seems readily available and there is an extrusion screw being sold on the bazar that is designed for this narrower ID, but I am not sure about standard fittings with the 35mm OD yet.
hola, ya buscaste tubo de acero negro?
se me ocurre que quizá tengas que hacerle ranuras y meter anillos tipo pistón de moto o de podadora, para que tengas cero o ningún claro y no pierdas material.
Otra que se me ocurre es que te ayudes de un tornero.
Suerte.
Hello, I did the test, and I have a problem with the fuel transfer because the tube and plunger have 1 mm difference the plastic is filtered inside the tube 
any solution?
it´s seamless, so in order to be perfectly compatible with other components, so you won´t have to change anything the tube must be 34 mm outer diameter and 26 mm inner diameter? Thanks for the answer 
2mm wall will be strong enough to withstand the pressure, but you won’t be able to thread the end with the 1″ BSP thread, you will have to use a very fine pitch thread instead and will need a custom nozzle/fittings.
Is the tube seamless on the inside or is it welded?
The thickness of the tube has to be 4 mm? I can get 2 mm thick tube with inner diameter 26 mm for 5 euro. Thanks for the answer.
@fade-roymarkinez you’re welcome
@andyn exactly
I’d agree with @xxxolivierxxx about 0.5-1mm overall clearance is a good balance, the screw will still generate enough pressure. If it’s too tight and the screw rubs the metal can gall and the screw and barrel can cold-weld together. If this happens you won’t get them apart again with out destroying something.
@xxxolivierxxx Thanks for the info!
This helps me a lot
@sonik Yes and no. 1mm (0.5mm each side) to 2 mm (1mm each side) of clearance is good enough, if your drill bit is tighter it will cause grinding of the inside of the tube when the metal expands/contracts due to heating
@xxxolivierxxx I don’t understand that: “ensure that the drill bit you get has a diameter of at least 1 or 2mm less than the internal diameter of the tube.”
Isnt it supposed to fit as tight as possible?
@fade-roymarkinez I would advice you not to stick to the same Precious Plastic measurements so strictly, just find any tube with close measurements and ensure that the drill bit you get has a diameter of at least 1 or 2mm less than the internal diameter of the tube. As a suggestion, look for places that sell “piston tubes”, since those are perfectly smooth on the inside
Hey @fade-roymarkinez, it is indeed tricky to find this tube, especially for an affordable price.
I bought a 6m tube 35×4,5mm (so inside ø26) and cut it in 530mm-pieces. As we needed only two of them, we are selling the rest now – 25€/piece.
Will put it on the Bazar as well, but feel free to contact me anyway