A reply to my own post !! As I was explaining the problem in the post I thought I would check if the 'remove compensation/zero Z/replace compensation' would work Short answer - No, Longer answer, I think I understand now what is happening, and I do think it is incorrect. Remove bed compensation M561 Set Z height G92 Z0.0 Replace bed compensation G30 P0 X60 Y0 Z 0.0by chriscain - Ormerod
I am not sure I am understanding this correctly but the way G92 works when bed compensation is in place seems wrong. If I set up bed compensation, then go to a point and set up the Z height by measuing and using G92 to set the Z position I would expect the Z position at that point to be what I have set !, i.e. that is the current height of Z So (Bed compensation set up) G1 X100 Y100 ; Move toby chriscain - Ormerod
Flushed with success at completing the Ormerod and printing my first few things including some parts for a part built Prussa the part quality is great. I would now like to try printing with ABS, having read up on this it seems that fan cooling of the part is only for PLA ? Do I need to do anything to use ABS in the Ormerod other than change the extruder/bed tems and load ABS ? Would blocking tby chriscain - Ormerod
I also found the front bearing/bed connection was not very positive. the carriage was running smoothly but over a number of moves the front bearing slipped sideways a bit occasionally. In my case I already had a 'spare' hole for the tie wrap as I had completely ignored the build instructions for the carriage and glued the wood parts together then varnished it all instead of using the captive sby chriscain - Ormerod
No, unfortunately not. At least in my case the SD card issue is NOT related to low voltage. However Steppers not running correctly, and Network connection are. I connected a variable 5V PSU instead of the USB Power to test more accurately. The 3.3 volt supply is generated from the 5 volt supply (either on board or US via a LM1117 Low drop out regulator drop out for this regulator is about 1 volby chriscain - Ormerod
I had not thought about the SD card problems. My SD card did not work and I swapped it for a different one that did, I will retry the orig now I have fixed the PSU issue and see if it works. It could be that the cards supplied have less of a voltage tolerance than some other brands and hence the problems being seen. Chrisby chriscain - Ormerod
The hub was powered from the PC, always been ok with stuff so far but only used for mice/keyboard etc so not much of a challenge. Interestingly the web/network interface also seemed a bit intermittent before I swapped over and is now 100% so I guess the voltage was right on the edge of being able to run even the network or CPU on the board. All now working well and it is just in the process ofby chriscain - Ormerod
Dis-connected everything except the extruder drive stepper and started checking the voltages around the extruder stepper chip The only questionable one was that the 3.3 volts was low - only 2.9 volts Bridged JP9 to use the on board regulator instead of the USB voltage to drive it and the extruder motor started to run :-) Reconected everything, all working fine. A bit of investigation it looksby chriscain - Ormerod
None of the chips are even warm Cables are connected as per the diagram in the instructions Seems very strange that all would be dead, and there is not a lot common between them I have checked the voltage at the vref (stepper current set points) and it is 0.5 volts which seems correct to set the 800ma stepper drive current, checked this as the main common point for the 4 steppers was the referby chriscain - Ormerod
Fan works, - and is running correct direction. heaters (both bed and hot end) work 12 volts is good and correct way round Limit light on X limit works Z height detector works and gives good readings (moving the Z axis by hand) In fact everything seems to be working fine, except the motors are not powered !! Chrisby chriscain - Ormerod
Have completed the build Ormeron #261 All seemed to go well, was impressed by the quality of the printed parts in the kit. Conected to USB/Power/network and all looked good Flash card would not read in Ormerod and looked blank on a PC Downloaded latest firmware 040-17-12-2013 Successfully updated Duet, created a new SD Card by formatting a new one and copying the contents of SD-Image to it.by chriscain - Ormerod