I have documented my thoughts on a fibre core extrusion in the Wiki. The two concepts are winding the thread around the plastic so the correct amount goes into the melt zone so it will exit at the correct nozzle extrusion speed the other is some thoughts on a coaxial nozzle that would work much like a wire insulation machine but much slower. Interestingly I saw a machine that is used to makeby KalleP - Wire and Thread Embedded Extrusion
I think something else that keeps the waters muddy here is that there is not just a we and me, there is also the they. As I have said before there would be those people who would be happy to cede their bounties back to the project because they believe in RepRap or utopia but this cannot work now. Currently if one does a GPL one is giving to the we and the they and excluding the me. It should iby KalleP - General
RBisping Wrote: ------------------------------------------------------- > traumflug: while makerbot may have a boost in > sales over some period of time and individuals at > makerbot may make insane amounts of cash over that > period of time, they have already painted > themselves into a corner with their > software/firmware lockin issue. I am all for as > many people buyingby KalleP - General
bobc Wrote: ------------------------------------------------------- > Did you know that the top 10 contributors to the > Linux kernel include Red Hat, Intel, Novell, IBM, > Texas Instruments, Broadcom, Nokia, Samsung, > Oracle and Google? There is no way they would do > that if there was a NC clause in the GPL. Bobc: I wonder it the fact that they would like to see some oppositionby KalleP - General
samp20 Wrote: ------------------------------------------------------- > I had an idea the other day on how to build an > extruder changer where the extruder is static, Lovely idea. It might be one less operation if the motor was fixed and the coupling was a pair of gears. As the new head comes down it's gear would mesh with the motor gear. Many older plotters used to use the X and/or Yby KalleP - Developers
Traumflug Wrote: ------------------------------------------------------- > QuoteBobc you are a lone voice > > No personal assaults, please. Also I'm pretty sure > you'll find many more in other areas, like IRC or > the hangout. To Bobc My sincere apologies, that was uncalled for and not productive in any way. I also regret insinuating that you might be trolling, that was justby KalleP - General
bobc Wrote: ------------------------------------------------------- > KalleP Wrote: > > pie ois available. This way people could up > vote > > ideas and designs and they would get a larger > > portion of the whole. Adrian Bowyer would get > a > > big chunk of the ideas shares but over time > they > > would be a smaller percentage or he could > donateby KalleP - General
Senake Wrote: ------------------------------------------------------- > Quotebobc > QuoteQuote > My purpose in this post is to say why RepRap is, > and always will be, Open Source. > > I think it is pretty clear he is not interested in > closed source, pretend Open Source, LRC or > whatever you want to call it. > > > I do - now - fully understand why Adrian Bowby KalleP - General
destroyer2012 Wrote: ------------------------------------------------------- > QuoteKalleP > As a final note, remember that RepRap is not about > cheap 3D printers > > > Yes that is correct. Reprap is about REPLICATING > 3D printers. They should not be just "cheap" they > should be completely independent from suppliers. > That is the goal. Once the printer can fully &by KalleP - General
The existing licences are not up to the task, something new is needed and this discussion will help refine it. Morals are the only way to police a crowd licensing system. Found this thread a bit late so am replying to a number of posts all in one. bobc Wrote: ------------------------------------------------------- > Traumflug Wrote: > -------------------------------------------------- &gby KalleP - General
At a minimum a voting system that can track a number of different situations would be needed so community participation is in place, there may exist similar systems that could be modified. The following is a bit long but a fun read. Types of ideas I believe that there are three basic types of intellectual property that need to be addresses in the open source space and there cannot be a one sizeby KalleP - General
Medical drip systems are reasonably constant but also have semi-skilled human monitoring. Maintaining a fixed level is easy enough without having to invent anything. There is a limit to how simple one wants to make something if it will make the operation more complicated. The amount of corrosion in selected stainless steel or platinum wire will be low. There exist optical beam break (think enby KalleP - General
jasonharper Wrote: ------------------------------------------------------- > Ok, crazy idea time - what if the multi-Morgan had > one station with a fixed platform (not attached to > the Z mechanism like the rest), and an optical > mouse sensor instead of a hot end? With a printed > grid taped to the fixed platform, it could > accurately determine its X/Y position via the >by KalleP - Polar Machines, SCARA, Robot Arms
micromelt Wrote: ------------------------------------------------------- > There even used to be special vans to detect > operating TV and radio receivers based on leakage > of IM and oscillator frequency back into the > antenna. All true and even worse, in the UK where this was active policy they would also determine if you were watching a colour TV from the leakage of the colour bby KalleP - General
So who has head of 'pultrusion' a way they make some glass and carbon fibre composite rods like tent rods and aerial optical fibre cable core strength members. This is typically made by drawing a bunch of fibre filaments into a bath of epoxy or similar resin and then out through a nozzle and curing the wetted fibre bundle or tube. Prior art announcement follows, so no longer patentable unleby KalleP - General
I also think there is too much being made out of the absolute accuracy deal. As mentioned it only really matters in the Z-axis for most printers. There is one situation where it is important to have repeatable homing in the X and Y axis as well and that is on the printers that use line and capstans or smooth belts and flat pulleys and home on every layer to cancel the potential slip. In this cby KalleP - General
The Submerged Hot Point Extrusion (SHPF) can be married with hot piezo wax onto wax powder and with the Lava Bot principle. One could try use the wax powder as the buoyancy support and extrude liquid wax submerged in powder. We can go one better and extrude cyanoacrylate glue submerged a sodium bicarbonate powder (a common super glue fast activating filler powder use by the modelling fraterby KalleP - General
You want a new idea, here is another one. I call this one submerged hot point fusion SHPF :-) Take a soldering gun type thing and modify it so all the heat occurs at the tip (solid copper conductors and a tiny tungsten coiled filament). Now submerge this in a tray of loose wax powder and move the hot tip around leaving a trail of melted wax behind. Held in place by the wax powder surroundingby KalleP - General
twisted Wrote: ------------------------------------------------------- > Looking good, just need to find something > worthwhile to contribute. Check out the To Do page.by KalleP - General
What if we took a wax piezo heads and mixed it up with a powder printer. Use the hot wax piezo head to spray a wax binder on wax powder to make homogeneous wax objects. Instead of heating with a laser that causes some shrinkage or building with liquid wax alone that has an uncertain layer top profile, what if one mixed the two technologies and used the fresh wax powder to level the surface eachby KalleP - General
@uGen: @Yvan: The Vesconite Hilube is PTFE loaded plastic. One would only have to melt the matrix and the PTFE filler should move with it as it is already well mixed in. I have heard of other lubricant loaded plastics, some have graphite, others use molybdenum disulfide, (the original Vesconite is black in colour and uses one of these) there may be more options I have not heard of. The pointby KalleP - General
There are PTFE filled plastics that have a very low static friction and very low wear. Here in South Africa the local brand is Vesconite Hilube: Not sure if it could be extruded but one would have to make fillament first. Having (split) bushes machined should be pretty practical. The material is more expensive than Nylon and similar but the bushes will require very little and the rod stockby KalleP - General
Malden Wrote: ------------------------------------------------------- > What is the benefit of poly vinyl alcohol ? What > is it and what would you use it for? It is an extrudable water soluble support material. A bit expensive and hygroscopic from what I hear. > I'm working on a single nozzle version of the > machine you describe above. The advantage is that > there is an Openby KalleP - General
Charles_2008 is trolling on purpose, do not communicate further with him. He was given the names of admins to PM in this thread that he asked for but did nothing about it except try and wind up yet another few people. We see Charles_2008 is reasonably eloquent in the thread here (except he does not read replies) and then is whiny trollish with a pretence of poor English in the thread here whby KalleP - General
Found a few links for light reading regarding ink and wax jet print heads. Some interesting formulas for drop formation in an continuous inkjet printer Page 72 has a diagram showing the Phaser arrangement. Turns out there are over 300 jets per colour and not 48 as I estimated. This means that the head has to move less than 1mm from side to side so the nozzles cover the whole drum width. Lotsby KalleP - General
MattMoses: Thanks for updating the page. Those process pics and video clips are just amazing. In the one showing the process from below through a sheet of plastic I notice something interesting. There is a second smaller spurious drop that ejects with each drop. I expect this is due to the burr inside the tiny orifice. I have seen similar splatter on ink-jet printer heads when they have beby KalleP - General
Years ago I did an unrelated project (electronic rugby goal verification, before high speed, hires digital cameras and DSPs) for a chap that had developed a way of high speed building fabrication. They built small 2/3 room houses out of a set number of standard panels. They used full wall size moulds. The process was something like the following. * 1: Apply mould release * 2; Spray concrete skby KalleP - General
Mark Bunds: Your project sounds pretty awesome. If you get it right you will have surmounted many tricky engineering hurdles. I could believe that while pre coloured filament may be the most repeatable way to get the CMYK colours it has a lot of 'heavy' mechanical overhead. My first attempts would be to see if a non-solid master-batch pigment stream could be blended inside the nozzle. Havingby KalleP - Developers
Not sure if this was mentioned, looks like it could work. Not sure of the status but a good start anyway.by KalleP - Developers
If the 'residue' is always white then it is a result of surface effects, the question is which plastic is causing it, the support residue in the solvent or the surface of the part. There are many plastic and solvent combinations that will whiten a plastic surface. I have found when trying to clean the plastic with the wrong solvent that I have almost destroyed the cosmetic look of parts, littleby KalleP - General