Similar things happen on the mac too, adding/removing things on the USB bus seems to block momentarily the transfer on other ports - when you're printing from SD card and connected via USB, the ormerod burbles away to the host telling it what's up, and it expects the host to reply - this burbling gets interrupted and the print stops. Perhaps surprisingly the cure for it is to tell the host toby rayhicks - Ormerod
@ groneorm, I think that knowing the exact resistor value would be useful, it would also be be necessary to know what the open-circuit voltage of the thermistor connector is, and what that voltage becomes when the known resistors are added. It looks like your major problem is one of gain, and a three-point measurement would be useful (using resistors of 100k, 10k, and 1k or lower (the thermistorby rayhicks - Ormerod
Richmo - first off, update your firmware to dc42's latest (you might have to update to reprappro's version 0.57a linked off the commissioning instructions first) you can find dc42's version here , once you've done that you should get iamburny's web interface (which along with dc42's firmware will allow you to transfer files easily), there's a thread here it's a long one but you should be able tby rayhicks - Ormerod
Indeed dc42 - it's quite a wide tolerance 20 LSB is more than 4bits worth surely? quite a margin when you're only playing with ten - I was busy editing my last post (since I had said it would be my last post!) when you replied -I've used your spreadsheet to check the results I tabulated elsewhere, based on what i measured the offset on my t3p3 board to be, I also pontificated on how best to fixby rayhicks - Ormerod
Sounds like it's well worth keeping some around then Dave, thanks very much for the info (especially for the handling tips- I'd probably have binned it after I did the fast run tbh ) Cheers Rayby rayhicks - Ormerod
KevM - if it IS the same problem (and chances are that it IS if you have tried all else), you should be able to increase your extruder temperature by 10-20 degrees and get on and print - just ignore the fact that you're using say 205, when people say it should be 185 (the problem is that your hot end THINKS it's at 205 when it's really at 185) etc. I've printed PLA at 240 by accident - it doesnby rayhicks - Ormerod
That does look good Dave - on a scale of polypropylene (eg milk bottle lid) to silicone rubber, how flexible would you say it is, and on the same scale, how hard? For the stringiness/retraction difficulty did you try slic3r's "Extra length on restart" (which the tooltip says is seldom needed - but this might be that one time...), Rayby rayhicks - Ormerod
And lastly... looking at the ADC specs for the SAM3X/3A series , tables 46-31 and 46-32 give the following offset error data: 12 BIT Parameter | Conditions | Min | Typ |Max| Units Offset error (Oe) | VDDIN 3.0V to <3.6V Single ended, DIFF=0, OFF=x, GAIN=xx| -30 |+11.5 |+56 |LSB 10 BIT Parameter | Conditionsby rayhicks - Ormerod
Groneorm and KevM - it may be that your problem is related another one which appeared today, if so there's a potential fix... and it's fairly straighforward to find out (using one resistor and a multimeter to measure its resistance and the voltage across the thermistor connector when open circuit and when the resistor is connected to it) - please take a look at this thread: Rayby rayhicks - Ormerod
Quotedc42 I've just spotted a design issue that may affect the thermistor readings. The 1K reference resistors are connected directly to the 3.3V supply, however the VDDANA and ADVREF inputs to the chip are both connected to 3.3V via LC networks. So the voltage on VDDANA and ADVREF will be lower than the voltage feeding the 1K resistors by the voltage drop in the inductors. This will cause the thby rayhicks - Ormerod
One thing on the numbers I gave above - both bed and extruder networks gave 2.975 from 3.278 (as measured on my multimeter) when divided over 990:9850 (measured series resistance versus measured test resistance) - calculating the divided voltage from the ref and the resistor values, I make it (9850/(9850+990))*3.278 =2.979, which means that all of the meter measurements are in pretty good agreemby rayhicks - Ormerod
Hi dc42 - I increased the series R in the spreadsheet until the calculated readout temperature in cell J11 (for a thermistor resistance of 99900) dropped to the same value my measured 99.9k resistor generated from the duet. On the t3p3 duet I'm running solely from USB power (it's not connected to a machine), and I'm inserting the resistor directly into the the terminal blocks (a handy inclusionby rayhicks - Ormerod
Ah yes - I wrote that before I'd downloaded the xls Cheers Rayby rayhicks - Ormerod
I've has a similar issue with two duets (see ) and have just this minute tested the one that would require heating if the ambient dropped below 15 or so (ie first thing in the morning), on the back of this thread - (reading down from this link gives some info on the thermistor and measurements that may be useful, as well as a very helpful spreadsheet from dc42) , using dc42's spreadsheet, I pluby rayhicks - Ormerod
Quotedc42 Ray, it's time you tried Libre Office But here is a .xls. Will do! - thanks for the conversion in the meantime Rayby rayhicks - Ormerod
just for fun, I compared my new RRP duet with the T3P3 duet with two known resistors and a short across the E0_TEMP input - I did this twice for the T3P3 which was running an older version of 0.57-dc42 (n or q I think) the results are as below (my original RRP duet behave similarly to the t3p3 one, with low readings at ambient and over-reporting at working temp, hence the comparison):by rayhicks - Ormerod
@dc42 -any chance you could an export an xls or xlsx please? My excel (2008 for Mac) refuses to open .ods, I found a converter but it seems to just have values, not equations. @groneorm, the release notes that describe setting the R25 and beta values are here: (scroll down the readme until near the end) Rayby rayhicks - Ormerod
Note the beta I gave in my last email is actually incorrect - the beta for the extruder thermistor should be 4138 (just in case you end up going in this direction). It may also be a bad idea to measure the resistance of R19 directly (directly probing both ends of the resistor should be OK, but might result in damaging the thermistor input pin on the chip if the input voltage is exceeded by yourby rayhicks - Ormerod
groneorm - the standard thermistor should have a resistance of 100k at 25°C - can you hold it at that temperature and measure its resistance with a multimeter? I've had three duets (original from RRP, returned because of manufacturing fault on the 5V regulator, a T3P3 duet, which I still have, and the warranty replacement from RRP which I still have), the first two both under-read hotend temperatby rayhicks - Ormerod
Hi Flyskyhy, I used a layer height of 0.24mm for all of the tests (and a width of 0.5). Since the volume of extrudate is what the slicers try to control, I'd say that diameter errors (both filament and nozzle) are more important than length errors (since the volume is proportional to the square of the diameter, but only directly proportional to length). I agree with your comments on the extruby rayhicks - Ormerod
Quotedc42 I should have made it clear that my direct-on-glass instructions were for PLA. I've not heard of ABS being printed successfully direct on glass. Yes, it's a shame - when Kim first reported using vinegar I tried with ABS, and like dmould ended up with something behaving like raclette on a teflon griddle It's why I stick with the cement, it works great for both plastics. Dave, I seldoby rayhicks - Ormerod
Doh - you beat me to it Allan I'm hoping to do that with my new bed - just constrain the glass horizontally using preload springs, rather than squeeze it vertically with clamps/clips to keep it still (which may cause doming if whatever it's resting on isn't flat is domed) - looking good! Rayby rayhicks - Ormerod
Hi KeV, Looking at the wiki page on gcodes, G90 and G91 unfortunately don't specify parameters, , and just say Example: G90 "All coordinates from now on are absolute relative to the origin of the machine. (This is the RepRap default.) " It's a semantic problem (and I don't mean to trivialise it by saying "semantic", I mean that the meaning isn't well defined) - I agree partly with what youby rayhicks - Ormerod
Have you tried measuring your nozzle diameter? Mine prints fine at 0.5mm, but if I try printing finer than that, I also get holes/overthinning - my nozzle fits a 0.5mm twist drill pretty tightly (I had to use a drill to clear it once). Also have you tried running at different temperatures? I just ran some tests today keeping the same slicing settings, but varying the nozzle temperature (theby rayhicks - Ormerod
Antlvk - one thing in the gcode that could stop the print is the "T0" command - there was a bug in early versions of the firmware that would prevent printing if an extruder was chosen twice (T0 selects extruder 0, T1 would select the second extruder if there was one, etc). I pointed this out to RRP in December I think, and they fixed it immediately, so if you're running a current version of firmby rayhicks - Ormerod
Quoteepninety This is the first time I've tried using non-genuine Tufnol. It's Attwater SRBP in B4 grade, sourced on a whim from ebay. It's black, has a very nice surface finish... at least until I've abused it with the contents of the toolbox Dave Thanks Dave - I'll see what my stockists have in the morning, SRBP based should be cheapest I hope Cheers Ray ps it ain't gonna be pretty onceby rayhicks - Ormerod
Indeed bobtidey, I'm pretty sure the heat spreader is redundant between the heater PCB and the glass - the spacing of the pcb tracks is much narrower than the thickness of the glass, so the temperature variation shouldn't be that great (if the tracks were say 10mm apart, then you'd get peaks and troughs that the aluminium would smooth out, but as it is it's fine). I tried one of my larger areaby rayhicks - Ormerod
QuoteRadian Haha! So that's why! I've been air printing for too long while playing around with the Ultrasound. Yeah it's funny how you kinda forget why you started once you get stuck into a project isn't it - I've had similar EUREKA moments more often than I'd wish Good work on the ultrasound by the way! - I would've tested one of your circuits, but didn't have the parts or skillz Cheers Rby rayhicks - Ormerod
Thanks for updating Dave, Tufnols have been on my "must get" list for handy materials for a while, and what you're saying puts them higher - maybe first thing in the morning in fact Do you know what "grade" or "brand" yours is? ( the varieties are sold as "whale brand", "carp brand", "grade 2F/14" etc) or at least whether it's paper, cloth or glass based? Be interesting to compare oak with Darby rayhicks - Ormerod