Hi nof, According to the specs of the Arduino Due on which the Duet electronics is based, the most current that any of the pins can supply is 15mA source or 9mA sink. I'm running the LED at 40mA to increase the IR output and thereby decrease the effect of ambient light. Even if I accepted a reduction in current to 15mA, I still think that direct drive wouldn't be such a good idea, because the voby dc42 - Ormerod
My hot end registers either 5.4 or 9.8C at room temperature, which is about 20C where I have the Ormerod. It sounds as though yours is 2 quanta of measurement lower at room temperature than mine. I guess it's not impossible that you have a dud thermistor, or that you overcooked it while shrinking the PTFE sleeving on. I would ask RepRappro for another thermistor + heatshrink. But a blockage is ceby dc42 - Ormerod
I don't think there is any blockage. Printing generally works OK, I just think it's trying to extrude the filament faster than it wants to melt. I'll try a lower feed setting or a higher temperature.by dc42 - Ormerod
Ah, I had missed the fact that there was already a 5mm long duct.by dc42 - Ormerod
I've already tried sliding a 4th wire into the sheath of the sensor cable, and it fits easily. I'm planning to either epoxy a 4th header pin to the board, or solder a 4-way header strip to the existing 3-way header strip to make the 4th connection. I would design and order a pcb that incorporates the extra circuitry, but I expect RepRapPro will do that soon enough anyway. So for now I'll just solby dc42 - Ormerod
Have you tried using a different IP address? Some routers like to manage IP addresses in a certain range via DHCP. I changed mine to 192.168.1.80. Also, does the gateway IP address in config.g match the IP address of your own router? I don't know if it matters, but I changed it to the IP address of my own router before I tried connecting.by dc42 - Ormerod
I'm wondering (and I think I mentioned it in another post) whether a 10mm thick fan separated from the heatsink by 5mm or 10mm spacers would provide better cooling and less backwash. With the fan right against the heatsink, there will surely be no airflow near the centre or the corners of the heatsink.by dc42 - Ormerod
When I connect via Ethernet, I always see the control page briefly before the login page appears. So I think this is normal behaviour.by dc42 - Ormerod
Yes Chris, that is exactly what I was going to do, along with adding a transistor to drive the led from an output pin. The SAM processor output pins can't supply much current and I am running the led at 40mA.by dc42 - Ormerod
Hi Rory, Yes I wanted to add modulation to the IR emitter, however the firmware needs to be changed for that and I can't build the firmware at the moment (it doesn't build under Arduino IDE despite having a .ino file). So for now I have been limited to changing component values.by dc42 - Ormerod
1. Re gluing acrylic, I understand that you need a special glue for this (acrylic monomer) because most adhesives won't adhere well to acrylic. 2. Re allen head screws, after assembling a few joints I went out and bought 2mm and 2.5mm hex drivers, because I realised it would take an age to assemble all the joints using allens keys. I think this should be recommended in the build instructions. Onby dc42 - Ormerod
Hi Ian, I made 2 resistor changes: 1. Reduced the LED drive series resistor from 160 ohms to 51 ohms, in order to increase the current from 13mA to 40mA. This increases the light output by a factor of about 3, and thereby decreases the effect of ambient light by a similar factor. 2. Reduced the phototransistor load resistor by a factor of 5.5. This is partly to compensate for the IR output havby dc42 - Ormerod
PS: 1. The sensor part number is TCRT1000, not TPRT1000 as I said in my original post. Datasheet here: TCRT1000 2. For anyone else contemplating this mod, I now think the 2.7K load resistor I used could be increased to about 3.9K or perhaps even 4.7K. The important thing is to make sure the reading at the Z-distance you want to use for calibration is below 700.The sensitivity drops off when theby dc42 - Ormerod
You mean the stepper motor drivers? If they are the A4988 as used on previous RepRaps, then at the 800mA current programmed into them in config.g they should not need a heatsink.by dc42 - Ormerod
I've just done a lengthy print job, and the Ormerod stopped just before finishing. It has either finished or nearly finished laying down filament. It didn't execute the standard commands at the end of the gcode file to move the print head and turn off the heaters, it left the print head in contact with the work and the heaters on. Has anyone else experienced this?by dc42 - Ormerod
Regarding "dished washers": because of the way washers are made (pressed from sheet metal), they are typically not quite flat. So if you lay one against a flat surface, either the inside or the outside will be in contact with the surface, depending on which way up you put it. The ones I received in the Ormerod kit were indeed not flat, but slightly dished in this way.by dc42 - Ormerod
FWIW I replaced the 9mm X-runner bearing by a 10mm (623ZZ) bearing today, and that finally resolved the problem I had with a sagging print head.by dc42 - Ormerod
I was able to connect over Ethernet using firmware that I downloaded on 20/12, so I think it must be have been the 17/12 firmware If you can ping it, then the Ethernet connection must be working and you should be able to connect. A few suggestions: - Have you checked that you really are pinging the Duet, i.e. the ping fails if you disconnect the cable or turn the Duet off? - Are you using Chromby dc42 - Ormerod
I was having a problem with Z axis homing and bed plane compensation. I set up the G32 command and automatic bed plane compensation coordinates as instructed. Before printing I home all axes and then run the bed plane compensation. But when I came to print, there were issues with distance between the nozzle and the bed. On one occasion, the nozzle was touching the bed and at least the first 2 layby dc42 - Ormerod
1. Did you update the firmware to latest, i.e. as of 2 days ago? 2. I use the automatic bed plane compensation, so I've never tried the G30 command.by dc42 - Ormerod
I find that I need to power up the Duet, and start trying to connect with Chrome within a few seconds. The first few attempts are unsuccessful because the Duet isn't ready, but after a few tries it connects. Occasionally I find it won't connect, and I have to power the Duet down and start again. Alternatively: power the Duet up, start pinging it, and as soon as I get a successful ping, connect wby dc42 - Ormerod
I've removed those resistors, replaced them with new ones in the correct orientation, and added the 5VEN jumper. So now the board works with ATX power alone. I'm getting 4.93V pin the +5V line. However, now I hear that another mod is needed, which is to solder the tabs of the USB connector to the board. Before I dismantle the unit again to do that mod, are there any other inspections or mods toby dc42 - Ormerod
Thanks! What slick3r parameters do you recommend then?by dc42 - Ormerod
The recommendation for Ormerod printing with PLA seems to be 65C and 205C. But these are normally set by the gcode file you are printing.by dc42 - Ormerod
I would hope that your board will be covered under warranty - it sounds like a manufacturing defect to me. In the meantime, I suggest you try to get Ethernet working. Preferably, plug it into your router. If like me you have it connected to a computer that is wirelessly connected to the router, then you need to bridge the wired and wireless network connections on the computer. When you have sorteby dc42 - Ormerod
Probably not related to problem #2, but I spotted a bug in the firmware. When processing the G10 command, there is no range check on the P parameter. As a result, if you pass any parameter other than -1 (which would set the bed temperature) or 0 (to set the extruder temperature), memory will be corrupted.by dc42 - Ormerod
Is there any chance that your X-belt is slipping? Did you tighten it by adjusting the X-motor position?by dc42 - Ormerod
Chris, I agree with you that the holes are too close to the corners, My MDF plate has partly delaminated between one of the holes and the corner.by dc42 - Ormerod
I've seen some strange behaviour from my Ormerod on several occasions. The problems started after I created and started using a setbed.g file, although they may be unrelated to that because I didn't do very much before that. The issues I see are: 1. Sometimes, when homing the Y axis when the current Y position is already zero, it doesn't drive the carriage to the endstop. Instead, it tries to drby dc42 - Ormerod