Thanks both I was looking for general settings. I'm not as familiar with Simplify 3D and just needed a 'safe' range to test with.

So after a looooot of hardwork and time I've finally gotten everything up and working on my Duet Wifi setup with the Rostock V2, and the most of the settings are fairly well calibrated. I don't have a lot of experience with Simplify 3D, my first slicer was Cura, so what are good speed settings for a Rostock V2 with an E3D V6 hot end?

Presently my settings are:
Default Printing Speed 2400.0 mm/min
Outline Underspeed 50%
Solid Infill Underspeed 80%
Solid Inflill Underspeed 80%
Support Structure Underspeed 80%
X/Y Axis Movement Speed 9000.0 mm/min
Z Axis Movement Speed 1200.0 mm/min

This seems painfully slow, but I'm really not sure of a good safe range for speed especially with the upgrades. Any suggestions? I will say the machine is presently whisper quiet. The loudest part now seems to be the power supply fan.

DC42: I'm using 210 throughout. Fan speeds startup at 25%.

Bot: I forget what type of tape I'm using but it was recommended as better then Kapton for hot end installation.

At this point its sounding more and more like the best choice is to simply move ahead the time table on my inevitable upgrade to an E3D hot end.

Bot: Done and done. No effect. I use a different, thicker tape then Kapton but basically the same stuff. I think whats happening, especially at the low levels is I'm just getting a lot of blow back from the fans on the hot end off the build plate.

DC42: I'm not using an E3D hot End. Saving up for one now, but I'm still using the stock Rostock hot end with a replacement heater cartridge. This is basically how I've printed with this machine since March. I've never had extrusion issues with the layer fans kicking in. I've always assumed that the thermistor is not capturing the correct internal temperature of the hot end, as on this unit the thermistor is mounted closer to the outside of the entire hot end assembly. Unlike my Ultimaker 2 where the thermistor is mounted as close to the center of the hot end end as possible. This means its more sensitive to external cooling initially, however, given time the temperature eventually evens out.

Stephen: I will try this.

DC42: I can confirm that when the layer fans turn on they do indeed drop the temperature on the hot end significantly. I have attempted a slower fan startup but this does not seem to fix the issue as even running at 25% it is enough to knock the hot end below the fault threshold. Is there any way to shut off this error checking or any other suggestion?

Stephen I have tuned the heaters. The lines

M307 H1 A467.0 C226.2 D12.3 S0.7 B0
M307 H0 A113.1 C743.8 D26.6 S1 B0

in my config file are the values I got after tuning them.

DC42, looking at the log files it does seem to occur shortly after the layer fans turn on. I'm not sure by how much the temperature drops, but considering I have 3 layer fans pointed in the hot ends direction it could be fairly significant. I will run through a test when I get home to find out the exact amount.

I feel like I'm so close to getting this machine working I can taste it, but every attempt to actually print something ends up in a Heater fault after the first layer or so. Leaving my bed or hot end at a specific temperature seems to work fine, and they'll stay at any temperature I set them to from the Duet web interface without fault. I only see issues when I load a g-code file and attempt to print.

I've installed my Duet Wifi on a Rostock Max V2, which is pretty much stock in all other regards (no Z probe, stock heater). I've also ran the heater calibration for both the bed and hot end.

My config.g file looks as follows:

; Communication and general
M111 S0 ; Debug off
M550 PRostockMaxV2 ; Machine name and Netbios name (can be anything you like)
M551 Preprap ; Machine password (used for FTP)
;*** If you have more than one Duet on your network, they must all have different MAC addresses, so change the last digits
M540 P0xBE:0xEF:0xDE:0xAD:0xFE:0xED ; MAC Address
;*** Wifi Networking
M552 S1 ; Enable WiFi
M555 P2 ; Set output to look like Marlin
M575 P1 B57600 S1 ; Comms parameters for PanelDue
G21 ; Work in millimetres
G90 ; Send absolute coordinates…
M83 ; ...but relative extruder moves
; Axis and motor configuration
M569 P0 S0 ; Drive 0 goes forwards
M569 P1 S1 ; Drive 1 goes forwards
M569 P2 S0 ; Drive 2 goes forwards
M569 P3 S0 ; Drive 3 goes forwards
M569 P4 S1 ; Drive 4 goes forwards
M574 X2 Y2 Z2 S1 ; set endstop configuration (all endstops at high end, active high)
;*** The homed height is deliberately set too high in the following - you will adjust it during calibration
M665 R143.626 L290.8 B140 H391.67 ; set delta radius, diagonal rod length, printable radius and homed height
M666 X-19.6 Y-20.25 Z-15.05 ; put your endstop adjustments here, or let auto calibration find them
M350 X16 Y16 E16 I1 ; Set 16x microstepping with interpolation
M92 X80 Y80 Z80 ; Set axis steps/mm
M906 X1400 Y1400 Z1400 E1400 I60 ; Set motor currents (mA) and increase idle current to 60%
M201 X1000 Y1000 Z1000 E1000 ; Accelerations (mm/s^2)
M203 X20000 Y20000 Z20000 E3600 ; Maximum speeds (mm/min)
M566 X1200 Y1200 Z1200 E1200 ; Maximum instant speed changes mm/minute
; Thermistors
M305 P0 T100000 B3950 R4700 H30 L0 ; Put your own H and/or L values here to set the bed thermistor ADC correction
M305 P1 T100000 B3974 R4700 H30 L0 ; Put your own H and/or L values here to set the first nozzle thermistor ADC correction
M305 P2 T100000 B3974 R4700 H30 L0 ; Put your own H and/or L values here to set the second nozzle thermistor ADC correction
M570 S180 ; Hot end may be a little slow to heat up so allow it 180 seconds
; Fans
M106 P1 H-1 ; disable thermostatic mode for fan 1
; Tool definitions
M563 P0 D0 H1 ; Define tool 0
G10 P0 S0 R0 ; Set tool 0 operating and standby temperatures
;*** If you have a single-nozzle build, comment the next 2 lines
;M563 P1 D1 H2 ; Define tool 1
;G10 P1 S0 R0 ; Set tool 1 operating and standby temperatures
M92 E93 ; Set extruder steps per mm
; Z probe and compensation definition
;*** If you have a switch instead of an IR probe, change P1 to P4 in the following M558 command
;M558 P1 X0 Y0 Z0 ; Z probe is an IR probe and is not used for homing any axes
;G31 X0 Y0 Z4.80 P500 ; Set the zprobe height and threshold (put your own values here)
;*** If you are using axis compensation, put the figures in the following command
M556 S78 X0 Y0 Z0 ; Axis compensation here
M208 S1 Z-0.2 ; set minimum Z
;
T0 ; select first hot end
M307 H1 A467.0 C226.2 D12.3 S0.7 B0
M307 H0 A113.1 C743.8 D26.6 S1 B0

I am using Simplify3d to Slice, and have set the GCode to Relative, and included the following lines in my startup:

G28 ; home all axes
M83 ; Makes the extruder interpret extrusion values as relative positions.
T0 ; DuetWifi standard procedure

Any help?