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People building or using RepRaps.
Re: Why Not use Nylon? - 14 years ago
It should also be possible to generate nylon from precursors as done in that school chemistry favorite - the nylon rope trick. We could use Epson piezo inkjet heads to deposit small drops of the two chemicals and the nylon would form where the drops mix. It would also set our resolution to be more like that of an inkjet printer (at least 300dpi) rather than the current 0.5mm. We could even addby davidgoodenough - General
Re: RepRapSurvey.org - 14 years ago
The survey has a problem, in that sometimes when validating replies it insists on answers when none are relevant. I forget exactly which question is was, but I got to a page which asked a question and gave me three options none of which were relevant - I could not proceed without giving a wrong answer. Davidby davidgoodenough - General
Re: openjdk - 14 years ago
Last time I tested it, OpenJDK 6 on Linux did seem to work. Davidby davidgoodenough - RepRap Host
Re: OpenJDK - 15 years ago
It has worked under OpenJDK for a while now at least on linux, and as most of the development is done under Eclipse it has been build using ecj and works - so it should work with the openjdk compiler as well. I have not checked it out with any of the openjdk-7 builds (the openjdk version will be the sun version for 7) but I see no reason why it should not work. Davidby davidgoodenough - RepRap Host
Article in this week's economist (sept 5th) - 15 years ago
In the quarterly technology review there is half a paragraph (page 22 of the review) at the end of an article about powder 3D systems mentioning RepRap. It suggests that projects like RepRap (and it is the only one that gets a mention) are only the mechanically minded, "... Others might want to wait until the local hardware store buys a 3-D printer and begins to offer one-off manufacturing serviby davidgoodenough - General
conductive adhesives? - 15 years ago
I notice in that there is talk of conductive adhesives. I wonder if these would be useful in the never ending quest to enable RepRap to build itself - and in particular to build circuit boards and attach components to them. Davidby davidgoodenough - Plastic Extruder Working Group
Re: inkjet head kit available now - 15 years ago
Do you have any information on driving any multi-colour cartridges? I know I could use two cartridges, but one would be simpler. Davidby davidgoodenough - General
Re: inkjet head kit available now - 15 years ago
Do you have a copy of the schematics for the circuitry. Davidby davidgoodenough - General
Re: Hard fire cement = useless? - 15 years ago
In the UK fire cement can be found in most DIY stores. Davidby davidgoodenough - Reprappers
Re: A digression on (ARM) floating point - 15 years ago
On the subject of later ARM chips, have you looked at building something around the BeagleBoard. It is in many ways the ARM equivalent of the Arduino in that it is Open Source. It also runs an operating system (linux by default) for which many development environments already exist and are readily available. Davidby davidgoodenough - Controllers
Re: Reprap Module Communication Working Group - 15 years ago
I can not evaluate it in any way having no idea what criteria you have to judge it by. In my book the only way to design a good system is to know what problem you are trying to solve. Otherwise you can never know if you have solved it. Davidby davidgoodenough - Controllers
Re: Reprap Module Communication Working Group - 15 years ago
Annirak, I would be VERY surprised if we needed anything approaching 10Mbps. In fact I would surprised if we needed 1Kbps per interface. As to latency, it matters, as it sets how quickly a packet can get to the target while other packets are moving around. It can occur if there is a collision based network and there is a lot of contention. It also matters whether the latency is predictable.by davidgoodenough - Controllers
Re: Reprap Module Communication Working Group - 15 years ago
Annirak, My point is in your response. You say "The protocol needs to be suitable for our needs in reprap". Where is the definition of what reprap needs? I have seen nothing about bandwidth, about address ranges, about whether this is master to slave, or slave to slave, about response latencies, or any of these things. Surely these need to be defined first. Davidby davidgoodenough - Controllers
Re: Data Link Layer, V2 - 15 years ago
As an observation from outside this discussion, it does seem odd that you are reinventing the wheel. There are plenty of protocols out there, and surely one of them fills what it needed and is available off the shelf. As far as I can see this discussion started with some decisions already made, and no clear definition of what is actually needed. Can I suggest that it would be a good idea to spby davidgoodenough - Controllers
Re: Invert Stepper Motor Direction? - 15 years ago
I had this problem. So I just turned the connector around. It does not fit exactly, but it works.by davidgoodenough - RepRap Host
Re: anyone confused between java versions? - 15 years ago
Only the top two of that list are of any use to you. Sometimes 5 is referred to as 1.5. Davidby davidgoodenough - RepRap Host
Re: Still have issue with One window on Mac O SX 10.4 - 15 years ago
Of course that document is from November 2007, some 15 months ago. A lot can change in that time.by davidgoodenough - RepRap Host
Re: Still have issue with One window on Mac O SX 10.4 - 15 years ago
Has anyone tried the Mac version of OpenJDK-6? I tried the latest version on Linux and it now works. This may be the better solution to the problem. Davidby davidgoodenough - RepRap Host
Re: Still have issue with One window on Mac O SX 10.4 - 15 years ago
ok, that looks to be the latest. Just to be clear, on the new layout, NO files need to be copied out of the directory that you install. In fact if you have old files that you have copied out they need to be removed. I am afraid that I am coming to the end of ability to help here, as I do not have a Mac and so I can not try things out. I am not sure who did the packaging for the Mac and whoeby davidgoodenough - RepRap Host
Re: Still have issue with One window on Mac O SX 10.4 - 15 years ago
That sounds like an old version. Are you absolutely certain you are using the current version (the current linux version is dated 2008/Dec/18)? Davidby davidgoodenough - RepRap Host
Re: Still have issue with One window on Mac O SX 10.4 - 15 years ago
Well I just tried the host software with the latest OpenJDK build on Debian sid, and it worked. So the next thing to try would be the latest version of OpenJDK (and I understand thet there is one) on a Mac and see if that works. But I do not have access to a Mac to try it on. If this works on the Mac as well, it means that we can drop the requirement for the swing-layout jar, and use the nowby davidgoodenough - RepRap Host
Re: Still have issue with One window on Mac O SX 10.4 - 15 years ago
The Java 6 code comes with GroupLayout built in, Java 5 did not, and that is why the external version is packaged with the code. The revised Linux and Windows instructions do still say Java 5 is required. So either those instructions are wrong (in which case they need fixing) or the Java 6 requirement on the Mac is something different and simply down to a Mac restriction. The latest version,by davidgoodenough - RepRap Host
Re: Still have issue with One window on Mac O SX 10.4 - 15 years ago
I was one of those who worked on repackaging the RepRap host software in its current form. The same code is used on Linux, Windows and Mac, and for Linux and Windows it only requires Java 5. In fact I specifically wanted to move to 6 (it simplifies things with the JARs you need), but I was told we could not. So the code does NOT require Java 6, but the environment may. It may be that the Macby davidgoodenough - RepRap Host
new way to produce printed circuits - 15 years ago
I am not sure how powerful a laser is needed to burn away the copy on a PCB, but if it is only pointing at a very small area it should not have to be too big.by davidgoodenough - Plastic Extruder Working Group
Re: First reprap-host .deb package - 15 years ago
Correction. Forget the last note from me - too late at night. There are now java3d and vecmath packages in the queue for sid, so in the very near future (presumably after lenny gets out and after the rush of new material that has been backed up during the freeze had been let loose) they will both be in sid. Davidby davidgoodenough - RepRap Host
Re: First reprap-host .deb package - 15 years ago
Petter may have given up, but Daniel has actually build packages and uploaded them to unstable. Its there and working! Davidby davidgoodenough - RepRap Host
Re: First reprap-host .deb package - 15 years ago
Is your intent that this should be uploaded to the Debian and Ubuntu repositories or that RepRap should maintain its own respository. I hope the former, and I hope that you are targetting this at both Debian and Ubuntu, not just Ubuntu. If you try to upload it to Debian, then you may find that the rework that I started and Adrian finished to get everything in the same directory causes some probby davidgoodenough - RepRap Host
Semiconductor ink - 15 years ago
I came across this:- which describes a new ink that is an N type semiconductor. There are already P type semiconductor inks according to the article, so one day we might even be able to print not just the circuit boards but the semiconductors as well. They talk of using a modified ink jet printer, maybe we should introduce them to the world of RepRap. Davidby davidgoodenough - Plastic Extruder Working Group
Re: Getting java host software to run on Leopard - 15 years ago
First question, are you using the latest version of the host code? Davidby davidgoodenough - RepRap Host
Re: jdesktop not found in eclipse with jre 1.6.0 - 15 years ago
In the most recent software bundle you will find the relevant JAR that contains this library from jdesktop.org. Add it to your project and the problem will go away. Strictly this is not needed for Java 6, as the relevant library has been added to rt.jar, BUT the package name was changed so you still need the old library. Davidby davidgoodenough - RepRap Host