Guys, had the same problem with the bootloader, same messages, also using USBTinyISP, and succeeded in the end using the following: - I used the 6-wire [!!!] cable; initially had the 10-wire one in the wrong socket, that does NOT work ;-) - put in the jumper in the USBTiny - open a terminal and run avrdude w/ the following command: sudo avrdude -c usbtiny -p m644p -U flash:w:ATmegaBOOT_644P.hby Joost - Controllers
Hello Mathias, Can you run the Host software with the debugging turned on, and post the output you get in the console here? You can turn the debugging on in the Properties of the host software. This might help finding the actual problem. Cheers, Joostby Joost - Mechanics
Since I had some troubles finding the optopstop components (specifically the H21LOI), and some problems with the micro switches (apparently superglue can break them) I thought it would be nice to have a (cheap) alternative. I used the components from an old mouse. This is the model that uses a ball and has some opto couplers and (infrared) LEDs inside. Took them out, soldered them on the opto sby Joost - Controllers
Jonathan, It does not save the correct properties after a change. I will look into the Preferences class and see where a synchronization & check can be inserted. Joostby Joost - RepRap Host
Jonathan, Actually, it has not done that. It took the properties file in /home/joost/.reprap, and I can see the properties.dist in the jar file contains some new/additional props, which are thus not loaded nor saved (added) in the old props file. So this does not work. It might be good to have (1) a version property in the props file that can be checked against the version in the dist file (faby Joost - RepRap Host
Jonathan, Yes, you're absolutely right - Ubuntu 7.10. I also tested version 0.8.3 and this works fine, it even kept my old properties ;-) Joostby Joost - RepRap Host
Jonathan, FYI - I have had no problems with the 0.8.1 host software on a dual core machine (an AMD64 in my case) running Java 1.6 and Ubuntu 7.1. I'll try 0.8.3 tonight and let you know if that works as well. Joostby Joost - RepRap Host
Well, figured out what it was. I noticed it sometimes also did not "home" when starting the Build; it seems that the micro switches I use are somehow not working properly, i.e. close the connection between the 2 pins on the PCB even when things are not near it, making the host sw think it is at it's base/home position all the time... Joostby Joost - RepRap Host
Hey all, I seem to bump into some strange error. I have a simle STL object (1mm high square with a hole) that I wanted to use to calibrate my Darwin. Sometimes this works, sometimes it doesn't. I basically load the object and run the Produce Build. I get the following error: Opening port /dev/ttyUSB0 Experimental: JNI_OnLoad called. Stable Library ========================================= Natiby Joost - RepRap Host
Hi Sebastian, I know there are a few other people from Holland around working on repstraps including myself, so I would like to have a Dutch Reprap User Group as well (and no, I do not think we should use the D.R.U.G abbreviation, even though that might be associated with our liberal policies on this matter ;-) Thanks in advance, Joostby Joost - Dutch User Group - Archive
Well, I made some modifications. First of all, the "wire design" is basically the one that is described here: Attached an image showing both sides of the top extruder parts with some mark-up. What I changed was the filament-guide-channel (made out of CAPA and placed in the MDF slot, used a 3mm rod to impress the shape) and I put in the half-washer bearings (used some CAPA as bearings before)by Joost - Mechanics
Hello all, It's been a while, but I figured it was about time to pick things up again. I have "upgraded" my Darwin variant a bit (using aluminum corner brackets instead of wood, which is a major improvement as far as accuracy/stability of the cartesian bot is concerned) and now bump into another problem. I made an extruder based on the new design (wire driven) out of wood. It does extrude forby Joost - Mechanics
Hey Bruce, This might help; execute the script in a shell. Joostby Joost - RepRap Host
Summer times here as well, plus a rather demanding project on my day job. Things have been very quiet. I have assembled Richard and bumped into 2 major problems. First, the accuracy of the corner brackets (made out of hardwood). The holes are not parallel or perpendicular, which gives problems (i.e. lowering the Z table makes the Z belt too loose so it falls of the gears because the studs are notby Joost - Reprappers
Hey Ron, Sounds like you thought it through :-) The size of the brackets shouldn't matter; as long as it is around 14 mm between the holes for the horizontal rods you're fine. About the gears: got 2 from a shop in Leiden, but they were very expensive (specially the belt) and not very good. My advice: get the belts from either an old printer or from RS components (get 6), splice them for the Zby Joost - Reprappers
Hey Ron, Interesting approach! Have you also tried to assemble the frame, and check if things are aligned? It is a problem I now seem to bump into with my wood corner brackets. When the vertical holes are not parallel, you risk that the studs for the Z bed are not parallel, which causes problems with the Z belt tension. I found that tolerances actually do play a bit of a role ... :-) Joostby Joost - Reprappers
Found this article on CNCZone , which I think could be interesting. It's not entirely open source, but maybe something to consider for future reprap machines, replacing the (expensive) steppers? Joostby Joost - Controllers
And this is what's so nice about "open source" and exchanging experiences ... Eric has tried using JB weld on the drive screw between wire and nut, but it fell apart(I think twice). Apparently JB weld cannot really handle the forces/stress; soldering seems a better option (I soldered mine using a soldering iron @350 degrees centigrades, no propane burner needed) Joostby Joost - Mechanics
Dan, I have documented some of my attempts here as well. I used a set of PDF drawings for the extruder (thanks to Bruce W). These are *not* dimensioned, but can be measured of the drawing (no time yet to finish this - they are attached). Also, I have more material as in the forum post but did not yet get to finalizing it. I can post it here, but then it is at our own risk if it works or not ..by Joost - General
Richard, You need to add java to you path, such that when typing "java" in the command line, Windows "knows" where to find it. Try to do the following: - Find out where the java.exe file is located (likely in the java program folder "bin") - Before you start the file, type in the command line first: set path="path to java.exe";%path% Use the quotes! If this works, add this as the first line toby Joost - RepRap Host
Englewood, Good that you finally got things to work better. As Eric mentioned, change the preference for the Z torque to 100% in the java application. This is an issue both Eric and I bumped into earlier. Maybe the default properties in the packaged java file could be fixed to avoid this (rather annoying) problem. That should solve the "wiggly" motor. As far as the schematic is concerned, thisby Joost - RepRap Host
When testing my system (1 comms board & 4 UCB's), I have found something that baffles me. Wen running the (same) comms/UCB configuration under Ubuntu using the built-in COM port on my PC, everything works (Java host app, stepper exerciser etc). When running this under Ubuntu using a USB->serial converter, everything works as well. But when I plug this USB->serial converter in my laptopby Joost - RepRap Host
For the large (Z) gears I made a simple press from plywood (3 plates, bottom had 8mm hole, middle large 50 mm hole, top 8mm hole, alle centered) and used a similar method as described on the wiki: place a piece of the timing belt inside the large hole, put warm capa in it and then press the 3 plates together with an m8 stud though the center holes. Worked very well. Small corrections to the gearsby Joost - Reprappers
I have experimented with this earlier, but found out it is not very useful for making parts for Drawin, definitely not when these are moving parts. Too brittle and soft; CAPA works so much better. Maybe for components that are not stressed at all (i.e. modified holder for the optopstops) this might be a useful material. Joostby Joost - Reprappers
Ooopp... made a mistake here. Should have been +/- 0.25, not 2.5 .. Joostby Joost - Reprappers
I have made a Darwin-clone out of plywood (19 and 9 mm), 44x44mm hardwood, stock aluminum square and rectangular tubing and MDF. This actually seems to work, although I can't tell yet if the accuracy is sufficient. In general, tolerances are +/- 2.5 mm for most parts, and most can also be made using fairly common power tools. Most important one I used was a decent drill press. Joostby Joost - Reprappers
Englewood, Ubuntu/Feisty Fawn doesn't really care *what* version of java you run; only the java host application does. I think the "standard" for now is Java 1.5, but 1.6 should be fine as well. Check this for the configuration of java on Ubuntu to be able to run the host software. Joostby Joost - RepRap Host
Zach, I had (accidentally) ordered the single shaft stepper motors from Nanotec. And this has not given any problems, but for the Z mounting bracket. I think you are now using the RP'ed parts for Darwin (?), where the mounting bracket for Z has been made so that the Z stepper "fits" (a little indentation for a circular part protruding from the motor flange) so you might need to modify that. I'veby Joost - Mechanics
englewood, Download and install an IRC client; a list is here Connect to irc.freenode.net and join channel #reprap Joostby Joost - RepRap Host
englewood, You can get the source code via SVN, it's in the firmware directory when you check it out. But maybe you can try to find the error first by looking at what works. The signals from the host application (java application) go through correctly, so that should be OK. The LED lights up, so that means the firmware is running. Have you tried to use the poke utility? When you run the java aby Joost - RepRap Host