I am sorry! - D3D/RRF now working

pro3d

@dc42
Oh I just measured the resistance after warming the thermistor in the oven. Not good?

dc42

@pro3d said in I am sorry! - D3D/RRF now working:

@dc42
Oh I just measured the resistance after warming the thermistor in the oven. Not good?

That depends on how accurate your oven thermostat is! Also, if it isn't a fan oven, the temperature will be very different between top and bottom.

The Marlin table for that thermistor probably assumes B=3950 (incorrectly) over the entire temperature range. So using B3950 in the M305 command may give you more similar results to Marlin at the same indicated temperature.

pro3d

@dc42

I changed the M305 and printed new cubes. Something is not as it should be and I dont understand that it is all due to temperature as it shoudl be ok in a 20c temp span (190-210)

I also now tried different driver modes
A : 1/16 I1- M566 X1200 Y1200 - M201 X2000 Y2000
B : 1/16 I0 - ...
C : 1/16 I1 S2 - ...
D : A: 1/16 I1 - M566 X600 Y600 - M201 X1000 Y1000

Here are some cubes with the benchmark in the middle

dc42

Why didn't you try reducing the temperature?

pro3d

@dc42

I have tried ranges from 190-210 and it does not extrude much lower

I also now tried 1/32 stepping on XY as that is what I have on the Ramps but it was the same result. I will try one slower

dc42

It really does look to me like a problem of extruding at too high a temperature without cooling. Have you checked how low you can set the temperature and still extrude when using the Duet? Bear in mind that the Duet may be displaying higher temperatures than your RAMPS did for a given actual temperature, because you are using a different thermistor configuration.

timcurtis67

@dc42 said in I am sorry! - D3D/RRF now working:

It really does look to me like a problem of extruding at too high a temperature without cooling.

+1 Looks like the temp is too hot. Have you tried running a temp tower with your duet setup?

pro3d

@timcurtis67

No temp tower - I just try to replicate what I do with the ramps controller

I just now check minimum extrusion temp - 190 is ok, 185 it skips

timcurtis67

@pro3d Current high enough on extruder stepper?

pro3d

@timcurtis67

It should be yes - It is not the motor that skips but the filament starts grinding

mrehorstdmd

A couple things:

At what speed/acceleration are these printed? A single 20 mm cube is too small to print by itself at reasonable speed/acceleration without a print cooler because the nozzle keeps putting down fresh plastic on still-hot plastic from the previous layer. Try printing two or three cubes, separated by a few cm in one go.

Cura defaults to 2.85 mm filament diameter and will grossly under extrude if you don't change the setting in the custom printer set-up (machine settings, extruder tab). The same value also shows up as the default diameter in the material section, even if you select a "generic" material, and can't be changed unless you set up a custom material. When you set up custom material, be sure to check the bed and extruder temperatures.

pro3d

@mrehorstdmd

Thanks for helping out - I am lost

I am printing them exactly same settings as on the ramps - same filament everything. The extrusion is taken care of now as it was wrong at first in Cura 341 - but not my later samples

I am running 2000/20 in acc/jerk and 50mms with 10s minimum layer time to ensure cooling between nozzle touch

Why does the ramps controller handle it and not the duet? Let me try printing 2 cubes to see if it helps

Here are some samples with different settings: I understand the XY not being all that great with no fan but the corners should be same as on ramps no?

dragonn

@pro3d do a temp tower. As said before the same temps from ramps and Duet can by different in real world.

pro3d

It does appear to be the temp yes. Printing two at the time did improve - these at 1/32 I0

Now the corners are fine

I have some retraction calibration to do - thanks again and sorry for being a pain in the world cup

pro3d

So here is the cube with a layer fan at 60mms

It is very good so I just need to figure out what caused the skip. The bed is almost floating so might be that or due to motor skip. Not sure. I did tighten my belts

Here is one at 50mms