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by Iltacitoduca
September 23rd, 2016, 4:46 am
Forum: General Discussion
Topic: UM2 print head project
Replies: 160
Views: 164024

Re: UM2 print head project

.... There's a point, after 1000-2000 retractions where the heat crawls up on the filament, expands and increases the friction to the point that the feeder can't push the filament. It doesn't make a clog perse, since the filament can be push and atomic can be done without problems, but when that ha...
by Iltacitoduca
September 23rd, 2016, 3:38 am
Forum: General Discussion
Topic: UM2 print head project
Replies: 160
Views: 164024

Re: UM2 print head project

What about other more interesting materials? like Carbon filled ABS or PA or PC... sincerly I find PLA useless IMO
by Iltacitoduca
September 22nd, 2016, 11:38 am
Forum: General Discussion
Topic: UM2 print head project
Replies: 160
Views: 164024

Re: UM2 print head project

Some data on PBI if anyone would try this material in the future: Used as hot end isolator/coupler it doesn't heat, at least at 250°C(all reference are about this temperature) it remains totally cold! (as Gudo as already wrote) It's stiff and is not prone to deformation It's an excelent material at ...
by Iltacitoduca
September 19th, 2016, 1:06 pm
Forum: The MarketPlace
Topic: Tungsten Carbide Tool for Nozzle Makers
Replies: 0
Views: 6517

Tungsten Carbide Tool for Nozzle Makers

Hi, If someone is interested I can sell, with payment via Paypal and regular invoice, the Tool to drill your nozzle in a perfect shape. At the moment I have two shape available, both for 2,85mm filament. Shape A : 40 degrees 3,2 or 3,1mm in diameter for 18 mm with 4 mm diameter shank Total Lenght 60...
by Iltacitoduca
September 19th, 2016, 4:24 am
Forum: Ultimaker 2 / Ultimaker 2+ / Extended & Go
Topic: PTFE coupler - Theory and practical details
Replies: 91
Views: 93124

Re: PTFE coupler - Theory and practical details

Ok, my new Widia tool for the nozzle was in my hands Friday



by Iltacitoduca
September 17th, 2016, 7:30 am
Forum: Ultimaker 2 / Ultimaker 2+ / Extended & Go
Topic: PTFE coupler - Theory and practical details
Replies: 91
Views: 93124

Re: PTFE coupler - Theory and practical details

Hi Izzy, yes, due to the dimensions of the parts, the linear variations are small and cannot be measured as you suggest... but we can calculate ... http://www.engineeringtoolbox.com/linear-expansion-coefficients-d_95.html Now, even if they are small, I do not think that should be underestimated in a...
by Iltacitoduca
September 16th, 2016, 12:00 pm
Forum: Ultimaker 2 / Ultimaker 2+ / Extended & Go
Topic: PTFE coupler - Theory and practical details
Replies: 91
Views: 93124

Re: PTFE coupler - Theory and practical details

Yes. but a fixed spacer does not compensate for thermal expansion like a spring do
by Iltacitoduca
September 16th, 2016, 7:07 am
Forum: Show off your latest print
Topic: Show off My latest Print
Replies: 176
Views: 202166

Re: Show off My latest Print

Yes you are right Neotko. Also the choice of such small dimensions has further reduced the contact surface with the filament.. And the spring (on my UM2 feeder at least) is very hard to compress perhaps just because the contact surface is very small ... (I tried some springs more soften, but the fi...
by Iltacitoduca
September 16th, 2016, 6:57 am
Forum: Show off your latest print
Topic: Show off My latest Print
Replies: 176
Views: 202166

Re: Show off My latest Print

ivan.akapulko wrote:Accordingly, the smaller the notch, the better the feeder transmits the force on the filament? Right?
IMHO It is the opposite.
With parity of force applied.... the more bigger is the surface in contact with the filament the smaller will be the force applied for mm^2... so less deformation
by Iltacitoduca
September 15th, 2016, 12:07 pm
Forum: Ultimaker 2 / Ultimaker 2+ / Extended & Go
Topic: PTFE coupler - Theory and practical details
Replies: 91
Views: 93124

Re: PTFE coupler - Theory and practical details

I wish to share my thought about the deformation of the spacer... So, have you ever noticed the shape where the spacer get in contact with the hot side of the integrated nozzle? https://plus.google.com/115298954657177960462/posts/RNiVDhosKZJ This could be the reason why the spacer begin to deform af...
by Iltacitoduca
September 15th, 2016, 11:31 am
Forum: General Discussion
Topic: UM2 print head project
Replies: 160
Views: 164024

Re: UM2 print head project

I was following this post in hope that Gudo could tell more about PBI compatibility with ABS... but I could not wait ... so I bought a 300mm rod of PBI to experience the long-time compatibility :-D I want try it with the new nozzles made of an alloy of Copper beryllium even if the alloy of aluminium...
by Iltacitoduca
September 15th, 2016, 11:12 am
Forum: Show off your latest print
Topic: Show off My latest Print
Replies: 176
Views: 202166

Re: Show off My latest Print

Yes you are right Neotko. Also the choice of such small dimensions has further reduced the contact surface with the filament.. And the spring (on my UM2 feeder at least) is very hard to compress perhaps just because the contact surface is very small ... (I tried some springs more soften, but the fil...
by Iltacitoduca
September 15th, 2016, 3:40 am
Forum: Show off your latest print
Topic: Show off My latest Print
Replies: 176
Views: 202166

Re: Show off My latest Print

But if you like to spend money for a new feeder which will have the same problem of grinding of the old one... it is a choice... I write this because there is no difference between the old one and the new one if you look at the part in contact with the filament.. And more power (looking at the gear...
by Iltacitoduca
September 15th, 2016, 3:35 am
Forum: Show off your latest print
Topic: Show off My latest Print
Replies: 176
Views: 202166

Re: Show off My latest Print

I'm quite liking ABS now, depending on the manufacturer my nozzle Temperature is about 245 and a bed temperature of 100, I use ABS gloop to the bed applied when the bed is at room temperature. I need to produce a decent test piece to calibrate and then allow for shrinkage. Over all I prefer the gre...
by Iltacitoduca
September 15th, 2016, 3:18 am
Forum: General 3D Printing Conversation
Topic: Welcome, where are you from?
Replies: 78
Views: 181004

Re: Welcome, where are you from?

Aluminium Bronze?? I want to know more plsss Hi Neotko, here more about https://en.wikipedia.org/wiki/Aluminium_bronze Next alloy I will try is Copper CuBe4 (beryllium cobalt) perhaps is better than Aluminium Bronze alloy for a more uniform thermal propagation EDIT! sorry a mistake on the alloy sym...

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