Dyze extruder

dcaron

I have just committed RRF version 1.17-dev1 on github. It includes changes to better support the Dyze thermistor, although I don't yet have one for testing with. See https://github.com/dc42/RepRapFirmware/blob/dev/WHATS_NEW for more details. Caution: I do minimal testing on dev builds.

Thank you David.
I will test the 1.17 dev tonight and report results with my Dyze 500°C thermistor.

mb0

any progress on this? i have a dyzend too and have trouble getting it running on 1.17dev6

dcaron

@mb0:

any progress on this? i have a dyzend too and have trouble getting it running on 1.17dev6

I tested the 1.17dev6. It works, however the thermistor still has so much resistance at room temp that the reported temperature is still off and fluctuating. Moreover, the auto range ADC calibration means it sometimes initializes at 2-10°C at room temp or 15-30°C randomly. The room temperature fluctuation mens RRF forbids auto calibration. Dyze Design has a PT100 coming out very soon. I got it early and works well with the pt100 daughterboard. Now things work flawlessly.

mb0

thanks, mind sharing your parameters for the default stuff? i got pid tuning to start after several tries but then complains about temperature overshooting / reaching to fast and aborts.

dcaron

Temperature overshooting is likely since the hotend has a big heater. On 24v I used 20% power to tune. On 12v, don't go over 50% PWM.

MatteoQ

Hi, we try many solutions to use dyze 12v 500°C thermistor on duet wifi.
I read this thread but we don't understand if there is solutions for this problem.
Someone had found a good trick?
thanks

dc42

The main issue (not just with the Duet) is that at room temperatures the Dyze thermistor has such a large resistance that the firmware thinks that no thermistor is connected. A workaround is to connect a fixed resistor in parallel with the thermistor, just low enough so that the firmware detects that a thermistor is present. A value of about 300-500Kohms would be about right. This will give you an artificially high reading at room temperature, but it will not significantly affect the reading at the temperatures you use for extrusion.

For better accuracy over a large temperature range I suggest a PT100 sensor. I believe Dyze has a PT100 option for their hot end now.

dcaron

Dyze have a PT100 available, however it's not advertised. I still got one at the very beginning they were hesitant to sell because the PT100 insulation wasn't up to their spec limiting the temperature under 380°C. I don't use it that high anyway. I can say it works like a charm, the Duet, PT100 and Dyzend really is a winning combination.

I highly encourage anone printing materials at 350°C and under to get the PT100 and the daughterbaord. Just ask Dyze design directly, they are very helpful.

MatteoQ

thank you for this info.
i don't knew that the PT100 will be available.
i ask to dyze asap.
i already have a MAXTempRTD v0.4 (PT100 RTD board). can i use that right?
this module is 2 input ready.