Gina

Actually, it does by the opposite from what I thought. Set to 1.5 and much better I'm going for a different item with a shorter printing time.

Not sure this is working... Adjusting Z height that is. I don't think this command line does what I think G31 P500 X24 Y0 Z3.0 ; Set Z probe trigger value, offset and trigger height I thought the Z parameter set the Z offset but now I don't think it does. The problem is the different terminology used by the Duet authors compared with marlin.

Halved the speed and it's better but now the print head seems too close to the bed so I'll adjust it to a higher value.

Tried a simple 100mm square by 30mm high block. Estimated printing time from Repetier Host was around 4 hours. Estimated time left on the Duet read 40 hours - ten times as long!! The extruder motor is skipping a lot but extruding filament, though I think too much. Looks like the X and Y axes are only running at one tenth the speed set (46mm/s) but it's trying to extrude as if it were running 10x faster. This is using CuraEngine within Repetier Host to generate the G-code file which I then transferred to the Duet. I'll try reducing the print speed in CuraEngine and see what happens.

Adjusted Z trigger height from 2.5 to 2.7mm and it's correct now. Still printing extremely slowly, of course. Think I'll try another item to print.

Printing not satisfactory. Motion in X and Y is extremely slow and extruder motor is skipping. The Z height is about 0.2mm too low (easily altered). Actually, homing is a bit slow in the Y axis, slower than the X axis but nothing like as slow as when printing. Cancelling printing leaves the hotend and bed heaters on - they have to be turned off individually by clicking on the appropriate heater.

Trying a test print again. A more powerful bed heater would be nice as the bed takes twice as long as the hotend to reach working temperature. I have a mains bed heater on order, on a slow boat from China, with nearly twice the power.

One thing I'm thinking about is that if I want to run off 24v, I can't use an ATX PSU (12v). I shall want a 5v PSU and an SSR to switch the main 24v supply so that the printer can power down (except for 5v) when printing has finished and hotend cooled. I often print overnight.

The 24v PSU fan doesn't make much noise depending on the load and even at full load it's not too bad.

I plan to use 24v for my Giant printer. I already have a 24v 60w cartridge hotend heater to go with a Volcano hotend. I shall need a 24v hotend fan. I might also change to 24v on my Titan printer (I have two 24v hotend heaters). It has a 24v bed heater running off one of those 24v 360W PSU that Julian linked to. That has a DIY power MOSFET driver but the Duet could handle the 15A directly, though only with a massive 24v PSU. It would be nice to upgrade the bed heater on that to mains voltage - makes sense.

Increased extruder current from 800mA to 1A and it's now extruding fine. Might need more when extruding due to the pressure of squeezing the filament.

Thanks - thought I'd seen it somewhere Done it - added 260°C Trying the extrusion again. Later... Better but still skipping steps a bit.

Took hotend off, unscrewed heatsink and just pulled filament out from the bottom. It had a blob on the end stopping it going either way. Tried extruding but the motor was skipping a bit, may need more current. Did extrude though even though it was ABS and the manual preset temperatures only go up to 135°C (I use 180°C for printing). I think the preset temperatures may be changed but I can't see where ATM.

I was going to suggest running 3 motors in series from a 24v supply. No individual control though.

There's a 60mm long NEMA 17 though not from Ooznest. I've seen them from other sellers I use. But if you're satisfied with what you've got, fair enough.

Sounds like you need a bigger motor. What size are you using at present? (length)

Complicated, isn't it!

Which slicer do you use with the Duet Dave?

I shall have to take the hotend apart to unblock it - tomorrow, probably, as I think I've had enough for today.

Tried printing having set up the CuraEngine slicer as seemed right, saved the gcode file, transferred it to the main computer and uploaded it to the Duet. All the usual pre-printing actions happened. Hotend and bed started heating up, all axes homed and it performed bed level calibration. When hot it ran the extruder at an enormous speed and stripped the filament. Not seeing a Stop Print I used Pause. Then I searched in vain for a Stop Print control but no joy. There only the Emergency Stop which turns everything off leaving filament in the hot hotend with no cooling fan running BAD. Guess the work-around is to turn the heaters off and let the hotend cool before turning the main power off.

That seem to be another hurdle overcome. It's getting very near to trying printing now Probably when even more fun starts

I've adjusted the hardware bed levelling and got it more level.

Thanks very much for your help

Ah, I've worked out the logic of the problem. If the probe point is X=15 the X carriage must move to X=-9 which is impossible so the probe point must be more than the offset. I was looking at it the wrong way.

Probe is 24mm to the right of the nozzle ie. X+24 and no Y offset.