@arnaud31 Looking at the filamentprint website who RS have selected for their PLA supplier, they state: QuoteA special modified PLA that produces very high quality models. Most manufactures just produce raw PLA, we have modified ours to produce outstanding results. .....offer the highest quality, stable colour and toleranced PLA and ABS This may be a marketing statement, but appears to be supportby Treth - Ormerod
@Markus thanks. I sent this to a friend at RS for comment.by Treth - Ormerod
I would add, yes there is development element for improvement and there is a great active improvement community. But in looking at the build of my system #007 so very early, what was essential and what is an enhancement? Well the replacement DUET to cure switching regulator and fix USB socket, but that is possibly the only essential in my view. Obviously that includes using the latest firmware aby Treth - Ormerod
@Radian, that's why I was suggesting grounding/earthing the aluminium plate (opening thread) as it seems to be easy to do and would provide a capacitive shield to the spikes in this area. My scope currently not working so can't investigate. I don't want to make things worse!!!by Treth - Ormerod
@Ray, yes good features to have, I want them too!by Treth - Ormerod
Quotemarkbee @Treth Not sure though what you mean with a "web along the top"? Markus Probably the wrong term, but a piece coming out at right angles (as if machined from aluminium angle) which is similar to original printed part on the bottom edge (which should be retained). Or any other solution which removes the belt force from the acrylic parts.by Treth - Ormerod
@djb, nice idea about clothes peg spring, hadn't seen that one. @markus, great tensioning and adjustment idea, that looks good. Thoughts for improvement (while we have acrylic end plates) is, could you add a web along the top (may need to increase the height slightly) to stop it flexing under the belt tension and pressing on the acrylic part? This could be similar to the bottom edge web of the oby Treth - Ormerod
QuoteT3P3 Hi Treth ... I have also done quite a bit of testing with modified firmware which uses PWM on the bed - this is noisey at the standard 1KHz and not currently recommended but in doing so the Duets (v0.4 and 0.6) in question have been subjected to many millions spikes without causing a processor hang. Cheers Thanks Tony, that is all of interest, but on your last point on PWM and the largby Treth - Ormerod
Quotedc42 ....It's still a bit sensitive to ambient light, but the sensitivity has been reduced by a factor of 14.5. The practical upshot of this is that when I do a bed probe or z-axis home, the effect of having that light on is make the nozzle just over 0.1mm too high. Without modulation, having the same light on makes the nozzle 2.5mm too high. I can see that the G31 reading is more variableby Treth - Ormerod
Hi Radian, You will get lots of different opinions on this. My thoughts.... the current DUET has the screen soldered on two or four pins, BUT it is still not grounded, i.e. the pads do not connect anywhere. Opinion is divided amongst the big names between and R/C to 0V or a short via a ferrite bead (plus some other views) but the DUET is currently open circuit on this screen. I pointed this outby Treth - Ormerod
Thanks for clarification Ray, explains why your method is probably successful, I shall have to venture out to my local DIY store. Tomorrow hope to upgrade all the firmware and Pronterface with all good developments that have happened, so thanks to everyone on that. to typo....by Treth - Ormerod
I had a play with an UP! 3D printer last Friday at Falmouth University printing ABS and their method is to use a printing surface that is like a perforated laminate (fibreglass?) pin board ( PCB without copper) on approx 0.05" pich (not standard 0.1" pitch), this sits on and is clipped to the heated base. Their software prints a base layer that sticks to this and in our case exceeded the base ofby Treth - Ormerod
So is the inside of the union a counter sink? I had presumed the pencil sharpener used on the end of the tube was just to get the thread started, but now see that the hole is drilled and will have a countersink. My tube was simply slightly shaved and went in very easily, I did put a slight mark on the tube to check it went about 10mm and there have been no printing issues. I haven't looked at thby Treth - Ormerod
@arnaud31, Interesting thoughts on heat soaking for this, but it may make it form a tighter loop, my RS supplied filaments seem to want to straighten themselves which I thought was a desirable attribute? My thoughts on heat soaking in the past were how much moisture is in the PLA and whether this was a good or bad thing in relation to print quality and whether it is removed in some way at the eby Treth - Ormerod
Hi DC42, I liked the first Cyprus link which is also in the allaboutcircuits link I posted. There are also links to other semiconductor manufacturers included below which could also provide some useful info. - “Tying the shield directly to ground would create a direct path from the ground plane to the shield, turning the USB cable into an antenna. To limit the USB cable antenna effect, it is recby Treth - Ormerod
Hi Ray, this method could be adapted with your 3D printing skills. I have used Igus linear slides and from memory they clamp the belt against a metal tooth part that slides in a slot to keep the belt engage a long screw through the toothed metal part pulls the belt into the slide to tension the belt. I didn't find a picture, but I'll sketch it for you if the above is not clear.by Treth - Ormerod
Quotedroftarts QuoteTrethThe network connector housing I also believe should be grounded. Just for reference the SD card housing IS connected to ground. I've just had a look at the schematic page 5, and it would appear that the USB 'shield' is grounded on the board. There is the problem of creating an earth loop when the other end of the USB is grounded, I know, so yes, it would be good to getby Treth - Ormerod
Hi Ian Quotedroftarts 2. USB socket on the board is dodgy, as suggested before. Check if all four pins are soldered - these not only provide support for the socket, but also ground it, so you may have problems if none of them are soldered In another post (long since lost!) I pointed out that the USB socket housing and the network socket housing are NOT grounded on the DUET. I questioned this, butby Treth - Ormerod
@DC42, Yes thanks for all your hard work in pushing everything forward so fast, really appreciated. @Markus, thanks also pushing the layers resolution (with DC42 and Ray), this really excites me. I hope to get back to starting printing this week, so with all the developments since I last 'powered up' (probably two weeks ago), nake this an exciting time. @Ian, you didn't have to add the ...by Treth - Ormerod
@jpp, check you pressed the reset button by the USB connector and not the firmware erase/update button by the network connector. If the latter then you obviously need to go through the update firmware process. Also recall that the DUET starts faster in a network lead is plugged in and connected at server/PC end as it does less time error checking.by Treth - Ormerod
Quotedc42 Is there any evidence that noise radiated by the bed is a problem for the operation of the Ormerod? There may have been, prior to the slowing down of the FET switch turn off (which I haven't incorporated), but it is such a simple thing to try, I thought I would post it. @Forum readers, I'm interested in how many have modified the FET driver to remove spikes? Post a reply YES or NO Iby Treth - Ormerod
@DC42, yes could be an overkill, but I'm considering this from several aspects. 1. Many people do not like to mod their DUET board, what if they cause other issues. The add on board allows the spike suppression to be easily incorporated (I'm still looking for original post but think the R and C can be added where my add on board allows for the two "R's" space) in the FET drive, accross the loadby Treth - Ormerod
I just had a sudden thought as I posted another post. A quick and easy thing to try is to use a crocodile clip on a length of flexible wire from the aluminium heater bed plate or the mounting nuts/bolts to the 0V from the PSU, I suggest picked up from one of the unused PSU leads. This will provide a screen and route for radiated noise back to the PSU.by Treth - Ormerod
Quoterayhicks Hi Treth, this is intriguing - could you show the schematic too please? Ray Hi Ray, I just quickly produced everything in the attached pdf which will hopefully clarify the proposal. It primarily replicates what is on the DUET board so there are no design changes. The new PCB would allow other options to be added such as spike suppression and PSU capacitors, isolation etc., Look fby Treth - Ormerod
@Markus, That is really useful and I didn't know such fun was on the horizon, indeed I hadn't considered just how many parameters there are! Your post above should be a 'sticky', I have saved a shortcut to it, thanks.by Treth - Ormerod
I'm fascinated and excited by these results, but what I can't get my mind round is the following: The extruder feeds the PLA under stepper control so assuming no slip then a controlled amount of PLA is fed into the system which is presumably calculated from the z height increment (layer step) and the extruder tip velocity. If this has any error then either a slight gap in the width extruded wilby Treth - Ormerod
Quoteiamburny No guinea pigs Beta Testers brave enough to try it out? Matt Firstly thanks for all your great work, it is appreciated by me. Unfortunately my Network knowledge, use and settings has all been plug and play so I probably would not help very much as it won't work for me(!) and 'my problems' will only confuse! BUT I do value your work (and others) that will be of benefit to me and thby Treth - Ormerod
@Markus, Very interesting tests and with EMI a significant result, it certainly confirms there is an EMI issue and your tests with ferrite cores shows there is a way of reducing the sensitivity. Thanks. The cell phone effect is probably due to the fact that as the signal strength received drops off the transmitted power from the phone goes up, so in a weak signal area the transmitted power canby Treth - Ormerod
Hi All, This may have been obvious to some of you, but thought I would point out this relatively simple add-on circuit. Concern has been expressed about the heater power/current heater switching spikes and the power supply arrangements. Looking at the Duet circuit there is a 2 pin external FET connection, so what use is that, well see the attached image. If the bed heater ribbon is removed tby Treth - Ormerod
Hi justindav1s Sorry to hear that. I hadn't seen you on the forum with any queries, with some help you may have got further. I have mine up and running and things improving every day with this active and friendly forum.by Treth - Ormerod