First Layer and Extrusion Problems

Veti

@Frederik said in First Layer and Extrusion Problems:

i forgot E 830

i dont know what you mean by that

here is a guide on how to calibration it
https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Maestro+Guide+Part+4:+Calibration/40#s165

Frederik

@Veti My extruder steps are correct. 100mm are 100mm

Veti

the bottom looks a bit strange, did you enable raft?

Frederik

@Veti brim was activated. but i´m struggling with the z offset a little bit. sometimes its really good , on the next try its scrubbing over the bed.
The cube was also printed on the backside of my buildplate. not the pei side to avoid any additional damage to my surface.

i adjusted the bed to the subframe assembly with my digital calipers to ~ 0.05mm equal distances.

then i checked my bltouch mountig if it is perpenticular to the bed. that is also good.

then i homed z.

after that a true bed level with G32
another G32

Then mesh compensation with G29 and another G32 to Load the new Heightmap.

Now im testing with ABS Filament. because the pla before was constantly clogging in the heatbreak.

i adjustet my retraction to 1mm with 25mm/s speed and will see if it will be better. i have zero stringing with these settings.

Veti

@Frederik said in First Layer and Extrusion Problems:

after that a true bed level with G32
another G32
Then mesh compensation with G29 and another G32 to Load the new Heightmap.

that is not a good idea. the G32 after the G29 will mess up the mesh. also after running G32 you need to establish a new Z

Frederik

@Veti oh, I didn't know that. Then I won´t do a G32 after the G28 anymore

is the software handling everything after the G32 automatically from the heightmap every time I start a new print?

A Former User

@Veti said in First Layer and Extrusion Problems:

that is not a good idea. the G32 after the G29 will mess up the mesh. also after running G32 you need to establish a new Z

If you have a bed.g like below you already re-establish the Z datum all in one go.......

; bed.g
;
; called to perform automatic bed compensation via G32
;
G28                         ; Home all
G30 P0 X2 Y-2 Z-99999       ; Probe near the front left lead-screw
G30 P1 X152 Y278 Z-99999    ; Probe near the rear lead screw 
G30 P2 X290 Y-2 Z-99999 S3  ; Probe near the front right lead-screw
G30 P0 X2 Y-2 Z-99999       ; Probe near the front left lead-screw (Second Pass)
G30 P1 X152 Y278 Z-99999    ; Probe near the rear lead screw (Second Pass)
G30 P2 X290 Y-2 Z-99999 S3  ; Probe near the front right lead-screw (Second Pass) 
G91                         ; Switch to relative positioning moves
G1 H2 Z5 F8000              ; Drop the Z axis (the bed) by 5mm relative to its current position
G90                         ; Revert back to absolute positioning moves
G1 X160 Y155 F8000          ; Position the nozzle at the centre of the bed
G30                         ; Probe and set the height as probed
G29 S1 P"heightmap.csv"     ; Load the height map

A Former User

@Frederik said in First Layer and Extrusion Problems:

@Veti oh, I didn't know that. Then I won´t do a G32 after the G28 anymore

G32 must be initiated AFTER the printer has homed all axises otherwise the printer has NO reference to work from.

Here is what the Duet G-Code dozuki lists G28 & G32 as :

G28 Home

Example

G28 ; Home all axes

The purpose of homing is to allow the printer to obtain a reference of where it is in space.

G32: Run bed.g macro
Parameters

None

Example

G32:

The firmware executes macro file bed.g. This macro normally uses G30 commands to probe the bed and then perform auto calibration of a delta printer (see Calibrating a delta printer), or perform bed leveling by moving the Z leadscrews independently, or display the manual corrections needed to the bed levelling screws.

So if you do not carry out G28 before you attempt to carry out G32 you will receive and error message ; Not enough axises homed

Unless the printer was already homed which is what G28 does anyway.....

Frederik

@CaLviNx Thank you, then i think is everything ready. i startet to print a fanchroud out of ABS. im very curious how it comes out.

what would i have to change in my config.g to use a capazitive sensor with 3 wires ?

is the connection on the duet 3 like: +5V, GND, and io.in ?

what musst be changed in these lines ?

; Z-Probe
M950 S0 C"io7.out"                                    ; create servo pin 0 for BLTouch
M558 P9 C"^io7.in" H5 F120 T6000                      ; set Z probe type to bltouch and the dive height + speeds
G31 P500 X0 Y0 Z1.8                                 ; set Z probe trigger value, offset and trigger height

the last point , i want to change my mechanical endstop switches to optical ones.
But what i am doing, the endstopps are lighting up but i cant get them to trigger.

i´ve got 2 different ones.

one with high level when no trigger
and one with low level when no trigger

but i cant get the mo work

A Former User

@Frederik561

Im sorry i only used that type of Z sensor when i first started with the duet years ago, I found them to be very unreliable, they were very susceptible to temp changes , so I have forgotten how I wired them up. I only use the Duet IR sensor now

It would appear they would be as you say VCC, GND, SIG which would correspond with what you wrote.

there is a section in the Dozuki on Z-Probes

As for the optical end stops again I dont use them, I only use Omron mechanical switches, they operate fine even at high temps in a chamber.

You might try inverting the signal on either of those two switches to see if that gets them working, or another thing is to check to see what triggers them, i dont know they might be looking for a metal or a dark colour to trigger them if they are an optical IR sensor

Frederik

@CaLviNx how do you like the mini ir sensor ? is it working better than the bltouch ?

A Former User

@Frederik said in First Layer and Extrusion Problems:

@CaLviNx how do you like the mini ir sensor ? is it working better than the bltouch ?

Well that's a touchy subject for me at the moment....

I have 8 operational printers (and 1 core-xy in the build stage) at home, 6 of those that are running have Duet-3 's (with LC-1 tool-boards) 2 have Duet-2 wifi's installed.

All have IR Sensors fitted. The Duet-2 machines are still running RRF-2 as they just run and run and print day in day out without issue and have ran for years and years without issue.

The Duet-3 boards (all with LC1 Tool-boards) all suffer from an intermittent issue of the IR sensor triggering too soon (as in triggering when the head is about 20mm from the bed surface) doesnt happen all the time, you can boot and home and they home fine to the correct height. then you can go to home and the sensor triggers at 20mm again, I can overcome it by issuing a G92 Z30 command and manually driving the bed up very close to the head then homing Z again and this time it reads and prints correctly.(it is not the print surface as this happens on a few differing surfaces and if it was the print surface it wouldn't explain why it only happens intermittently)

As of the other day i updated my boards (and tool boards) to the newest firmware and the issue seems to be gone but we will see.

On the Duet-2's with older firmware, NO issues ever.

And as much as I personally dont like the Bl-Touch (I dont like moving parts of the pin which can get bent, and I dont like the packaging issues in mounting it), I do have a genuine one here, I did test it when I started getting early trigger issues on the IR sensor and it worked fine.

Veti

@Frederik said in First Layer and Extrusion Problems:

what would i have to change in my config.g to use a capazitive sensor with 3 wires ?

see
https://duet3d.dozuki.com/Wiki/Connecting_a_Z_probe#Section_NPN_output_normally_open_inductive_or_capacitive_sensor
or
https://duet3d.dozuki.com/Wiki/Connecting_a_Z_probe#Section_PNP_output_normally_open_inductive_or_capacitive_sensor

Frederik

@Veti Thank you.

Do you have an idea why I can't get optical switches to work? the LED on the sensor work and trigger, but the duet doesn't recognize it

Frederik

@CaLviNx WOW, 8 operationl Printers ? Thats amazing. Do you make a living out of printing ?

Ok, good to know, i was thinking about getting one for testing purposes.

Veti

@Frederik said in First Layer and Extrusion Problems:

Do you have an idea why I can't get optical switches to work? the LED on the sensor work and trigger, but the duet doesn't recognize it

maybe you switched signal and ground. how did you connect it. the lerdge endstop work fine in my delta.
btw only black objects will really block the light.

Frederik

@Veti i connect ground to G, V to 5V, and S to the io.in.

the led on the switch is on but i doesnt trigger in the software

Veti

the lerdge endstops are meant for 3.3v but should also work in 5v mode

post the changes you did in the config

Frederik

@Veti i used this config:

M574 X2 S1 P"!io1.in"                                 ; configure active-high endstop for high end on X via pin !io1.in
M574 Y1 S1 P"!io0.in"                                 ; configure active-high endstop for low end on Y via pin !io0.in

Should i connect with the additional resistors like it is mentioned in the dozuki

3.3V-compatible optical endstop
Connect Gnd to Gnd, Vcc of the opto sensor to 3V3, and the output of the opto sensor to STP/IN. Opto sensors usually have active high outputs, so use S1 in the M574 command.

Note: opto endstops made to the Generation 7 design are often claimed to be 3.3V-compatible, but in fact the design is marginal with a 5V supply and frequently doesn't work at all on 3.3V. Here are some workarounds:

- This design normally works with a 3.3V supply if you replace the 180 ohm opto switch series resistor resistor by 100 ohms. Tip: if your opto endswitch uses surface mount resistors, instead of removing the 180 ohm resistor it is easier to solder a 200 or 220 ohm resistor on top of it, so that the two resistors are connected in parallel. Make sure you pick the correct resistor to replace or solder another on top of! There is often also a load resistor, value 1K or higher.

- If you are using Duet 3 then you can use the 5V pin on the IO_ connector to provide power to the opto endstop instead of using 3.3V power.

- If you are using a Duet WiFi/Ethernet hardware rev 1.04 or later or a Duet Maestro, these boards can tolerate 5V on the endstop inputs. So you can provide them with a 5V supply instead (leaving the centre pin of the endstop connector not connected) and connect the outputs of your endstops directly to the STP/IN pins of the endstop connectors.

Veti

i run the endstops fine on my delta without resistors. the lerdge endstops are actually designed for 3.3v because the lerdge board run on 3.3v

check with m119 if you can trigger them.