There are a notes about this from people who ought to know (semiconductor manufacturers) here and here. So I would go with something like 4n7 in parallel with 1M between shield and ground, and ferrite beads in series with each of the four non-shield connections.by dc42 - Ormerod
Quoterayhicks @ dc I thought I'd uploaded the pic before I came home - I've added it now to the 60micron thread - the surface finish to the eye is somewhere between fine silk and satin, and I'm ery pleased Yes, it looks great! I've just printed a new z-driven gear to replace my wobbly one, and I'm thinking of re-doing it in 0.1mm. Quoterayhicks On the pausing issue, I've never had satisfactoryby dc42 - Ormerod
To bring this discussion back down to earth, I should point out that there is a disadvantage to the fix for fast USB printing, which is that it now takes a long time to pause the print from Pronterface. This is because there is a lot of end-to-end buffering in the serial-over-USB subsystem, so all the preceding data has to be received and processed by the Duet firmware before the pause request isby dc42 - Ormerod
Quotedroftarts Haha, I've been sitting on a beach in the Caribbean, counting piles of money, drinking Mojitos, while being fanned by dusky maidens, while dc42 does all the work, all this time! Don't worry, I can add it to the hardware bill (currently standing at 62p for one The Range photo frame and a few SMD resistors) if that makes you feel better!by dc42 - Ormerod
Ray & Markus, thanks for your kind words and for testing my changes. 0.04mm layers - wow! Looking forward to seeing your photos. btw the firmware only sees the first 24 files on the SD card, and the M30 command to delete files is not implemented. So if you want to print from SD, you either have to remove it to delete old files occasionally, or re-use the same filenames. I'm doing all my prinby dc42 - Ormerod
I've just adapted Andy's design for my own Omerod. Mine has a 7-bladed fan with a larger hub. I also wanted to make it thin enough to slide behind the electronics box. I reasoned that not having the number of stationary blades the same as the number of fan blades would be likely to make the fan quieter, and after experimenting with the design, I settled on 9 stationary blades. I found the skirt tby dc42 - Ormerod
I've just put my latest build on github, see link in first post in this thread. The significant changes from the Duet 0.53 standard build are: - Ethernet interface usually now recovers from disconnects and network errors. This also makes initial connection more reliable. It still gets stuck at the password page sometimes, but when this happens you can load the initial web page again to retry. -by dc42 - Ormerod
I'm running out of ideas, but just before Ian's latest post I was going to suggest: - In the Arduino IDE, did you remember to set the board type to "Arduino Due (native USB port)" before trying to run the serial monitor? - Also, try setting the newline indicator in the serial monitor to "both CR & LF" or whatever the wording is (I can't check it now because I'm printing), that's what I haveby dc42 - Ormerod
Quoterayhicks Printing many test files from SD has highlighted another problem (which may be repetier host-based, or may be a limitation of the the firmware) - once I get 24 files in the gcode directory, I need to pop the SD out and delete some using my mac - there seems to be a limit of 24 files I just checked, and there is indeed a limit of 24 files in the firmware source code. The M30 commanby dc42 - Ormerod
QuoteDANNYP200 Pronterface gives this error message 'could not open port COM12: The system cannot find the file specified' When I get that message (assuming that COM12 really is the correct port number), I find that I need to disconnect the USB cable (do it at the host end, unless you know that the USB socket on the Duet is properly soldered on the board) and reconnect it before Pronterface wilby dc42 - Ormerod
Quotechriscain This firmware with the Pronterface fix is working great for me. Does this binary also include your previous Network Fixes ?, My Network connection with this seems to have gone back to the works sometimes stage with lots of Network connection error code -10. Thanks for your feedback. Yes, it does include the network fixes. I gets lots of these code -10 errors when trying to conneby dc42 - Ormerod
I've put a new test version of my firmware build here (not on github yet) with some additional improvements: 1. SD card upload speed increased to 2.2Mb/min (you also need the Pronterface patch I already described to get up to this speed). 2. Fix for incorrect Z-axis movement when extruding 0.12mm layers and either printing from SD, or printing direct over USB and using my firmware build. The Z-by dc42 - Ormerod
Quoterayhicks @ ian Quotedroftarts Try doing a 'vase' print. This is like a spiral print, so the Z axis is in constant motion, upwards, except for the first couple of layers (though it may be a victim of the Z-small-move bug). There's a blog post on this here: I've tried that, it did suffer from the problem Slic3r 1 rc2 has a tick box option for spiral vase now by the way, so pretty easy toby dc42 - Ormerod
OK, I've read up on JSON now. How about I make a couple of changes to the responses: 1. The poll request currently sends back a single array called "poll". This contains all the temps and positions. A comment in the code suggests that the positions of the extra extruders will be added to this array. How about I add an extra variable for the z-probe reading? So the response would look like: {polby dc42 - Ormerod
martiangerbill & jpp, what COM port numbers did you use to flash the firmware successfully, and have you checked in Device Manager which COM port the port is now showing as? The port number when using bossac to flash the firmware is normally one higher than the "normal" one used for connecting the serial monitor or Pronterface.by dc42 - Ormerod
Try this firmware - it fixes it for me.by dc42 - Ormerod
Quoterayhicks @ dc - indeed your file worked fine via usb or from SD, I've attached a simple file that works over usb, but not from SD (the gears twitch when run from SD, but not from USB - note it seems to have always been the case that USB-based small Z steps worked), the gcodes file from the same stl file slic3d with a 0.3mm lift on retraction print properly from SD (ie the gears move properlby dc42 - Ormerod
It works for me equally well at 115000 and 250000, with the changes I describe in this thread.by dc42 - Ormerod
Quoterayhicks Will do DC - in the meantime, have you tried running your file from SD? It may prove enlightening... I just tried it from SD. It still works.by dc42 - Ormerod
Is there any evidence that noise radiated by the bed is a problem for the operation of the Ormerod?by dc42 - Ormerod
Personally, I think adding external stuff for the bed heater is overkill. I'm still using the Duet board (albeit with some mods, which may or may not be necessary) and the Alpine ATX power supply, and it has been working fine. I had one print hang before I modded the Duet board, and none since, apart from one that was caused by the attached PC going to sleep (the print restarted when I woke the Pby dc42 - Ormerod
I've just done some tests on Z axis movement in small steps. I'm using the attached file, which moves the head between two XY positions repeatedly and raises the height by 0.1mm between each move. It seems to be working fine. I'm using direct print over USB with my firmware changes (which mimic printing from the SD card) and Pronterface patch. Would you care to test it? If it works for you too,by dc42 - Ormerod
I've published the USB printing fixes to github. Note that the patch to Pronterface is still needed, see start of this thread.by dc42 - Ormerod
Have you checked that your print head is level? You can level it by adjusting the position of the x-runner bearing screw in its slot. If the print head really is level, I suggest you check that you have assembled it correctly, e.g. did you include the mdf spacer under the nozzle mount?by dc42 - Ormerod
Hi bobc, I've sorted this now, and started a new thread here. You are right, Pronterface was waiting for the OK response, and I had to patch it.by dc42 - Ormerod
Quotedroftarts I love those dodecahedrons. It was one of my first prints... I use this one scaled to half size as my standard test piece. It has thin edges so it prints quite fast, and it shows up any lumpiness or stringing issues quite well. btw the one in that photo is a direct print over USB. Quotedroftarts On my first printer... (That picture was taken the day I got it working! May 2011by dc42 - Ormerod
QuoteTMD_RS436 But yeah yours looks nice now, how stiff was the aluminium once you cut out the un needed areas? It feels very stiff, although I expect I could bend it over my knee. I used 3mm aluminium. However, adding the square section carbon fibre as in the post following mine looks an easier mod, especially if (like me) you don't have a drill press. QuoteTMD_RS436 Also how did you get it toby dc42 - Ormerod
Ray, thanks for your feedback. I needed to reduce the extruder temp by around 10C to get good prints after switching to the new temp calculation. Regarding the printer stalling, I believe this is due to ground loops. There are reports in another thread that a ferrite bead on the USB cable, or on the power feed between the ATX board and the Duet board, resolves this. Also you could try running thby dc42 - Ormerod
Wearing my safety-critical software hat, what is needed here is a risk analysis. In essence: - In what ways might internal component failure or external influence cause the system to fail with potentially dangerous or damaging consequences? - Considering the possible consequences of each of these failure modes, which ones must be avoided? - How can those consequences be avoided or mitigated? Itby dc42 - Ormerod
QuoteTMD_RS436 Hello dc Quotedc42 Yeah I was going to do the same by using a three sided bead support at first, but where I have been very unlucky as late I would probably crack or break one of the corners off, so I am thinking of the rectangle with corner angle supports just on the safe side. I think the glass + alu heat spreader + heated pcb combo would be very hard to break. I'm still usingby dc42 - Ormerod