prints not sticking (Page 1 of 2)

carl_m1968 wrote:

pricecg44 wrote:

Just played with the android app 'davinci calibrator' on my galaxy ace.
Looks good, numbers and turning directions come up.
Too chicken to fiddle at this point. I'm trying to get communications to work to be able to load to the SD card and run.

If you are running Repetier Frimware and host I would not advise running live over USB unless the newest version has fixed the issue I found. With the last version which was not in BIN form, I found there is a problem with the communication [rotocols. The Software will send the gcode data real time to the printer. The printer is supposed to send back to the software to not send anymore data as my buffer is full. It however doe not do this. Instead the software just keeps streaming the data to the printer until it is done. Then the printer will continue to print until what ever was loaded into the buffer at first is used up. You can test this or at least I could by changing the port speed. At higher speeds the issue would happen sooner. At lower speeds it would happen later. What would happen is once the buffer is empty the end gcode is never sent as it was streamed into oblivion. The head will stop with the heater on and the bed heater on and the head will just sit there melting a hole into the spot is stopped at.

Another issue I had when trying to print real time over USB is that the same comm issue would make the host lock up, Since the temp is monitored and controlled by the host this is a serious issue. If it locks up it no longer monitors the temp and so no longer adjust it. Both the bed and hot end will go into thermal runaway and reach whatever temp is possible until you smell ABS that is way too hot like I did. This also made the bed hot enough that the nuts on the adjusting screws inside the bed rounded out their holes and I had to glue them in so I could adjust my bed.

So please if you run Rep Firmware and host and try to print live over USB do not leave the printer alone. Also with this combination I have not been able to transfer files to the card.

I put my card inside the print area using an extension cable. I just remove it, put in my laptops card reader and put the files on it then put back in the printer. Restart the printer and print from the LCD. When I print from the card using the LCD I never have any issues with crashing, stalling, locking up, and so on.

I run Repetier firmware and host and I expected to have this problem because I remember you asking about baudrate in another thread. I have not seen this issue during my prints- although my longest print on repetier has only been about 5 hours. I run version 0.91 with my baudrate one level below stock (230,something). Is there a particular reason that I don't have this problem or have not encountered it just yet?

All of a sudden the  plastic lines are not sticking to the glass.

I presume the bed thermocouple  has changed?

Any similar experience.

My printer is effectively stuffed.

I recalibrated FINALLY after 30 attempts!!!, which is
practically non-functional, you could not zero in, it would
'wobble' over the place.  Also three measurements of the same positioning gave:
  062  189  232
188 214 273
173 205 272

there are some occasional way off (100) values.

I wonder if the temperatre of the extruder comes into play, there is a 10 deg C
variation of the extruder temp  from 220 to 206 when the measurements start as thebed trigger temp is reached and the extruder temp can be above or below the set.

I have first layers that have started to peel off. Is this not a sign of bed under-temp?

I have images, but cannot post them here- not priviledged enough or missed the well hidden gui interface.

pricecg44 wrote:

Ok so we have the newly calibrated platform that is the wrong height that would cause the prints to go wrong?

I presumed the printer determines the height of the printer and go from there.
Or is it just one corner and if the platform is off wrt the measured point it causes this.

I will try feeler gauges.

Your entire issue is that you are using the autocal. Stop ising it, it does not work correctly. The values it considers to be good are too high.

Buy a feeler gauge, pull out the .15 blade on it. I actually removed mine and leave it laying inside the printer. Now start one of the sample prints. Keep an eye on it as it warms up. You want to be there to turn off power once the head starts to move to do the print. Dont get hasty, when the bed reaches temp is will move down several mm. Don't turn off at this time. Wait for head to reach temp and to get over bed. The bed should move back up at the same time. If it is too high and the head actually hits it turn off power. Leave head and lower bed by screws till it is clear. Then start over. You want to cut power while the head is over the bed but not touching it. You then want to do the adjustments while the head and bed ate near operating temp. Dont wait for them to cool, but dont get burned either.

Once head is over bed and print is starting kill power. Now turn power back on and you should be able to move the head by grasping near the top and moving by hand to a point over the glass near one of screws. Adjust that screw so you can just feel the gauge dragging between the bed and nozzle. Repeat for each screw the one more time around the bed just to confirm as sometimes moving one side up will move the other down and likewise.  Once you do this, dont ever use autocal. Forget it even exist. You should only need to do this manual procedure about once every other week maybe even monthly depending on volume or if you hit or reall disturbe the bed by pushing down or lifting up to hard. You may then want to check it using this process, not the built in autcal.

rockosmodlife wrote:

The "squished" first layer is a good thing

my original query was non-sticky. It may be good and thin but it comes off.

anyway the first right side purge u-turn looks usual but comes off. 

it has to be bed temp, but I  will test  the manual 0.15 offset theory

ive got the offline gcode for the mini shreader gear cover part here is the start lines:

; filename = 3dg.3w   gear cover for mini shreader
; print_time = 19109
; machine = daVinciF10
; material = default
; layer_height = 0.300
; fill_density = 0.90
; raft_layers = 0
; support_material = 1
; support_material_extruder = 1
; fill_density = 0.90
; support_density = 0.15
; shells = 2
; speed = 45
; total_layers = 137
; version = 14100714
; total_filament = 29459.57
; extruder_filament = 29459.57:0.00
; dimension = 120.00:80.00:41.15
; extruder = 1
G21 ; set units to millimeters
M107
;M104 S200 ; set temperature
;M109 S200 ; wait for temperature to be reached
G90 ; use absolute coordinates
G92 E0
M82 ; use absolute distances for extrusion
G1 F1800.000 E-1.00000
G92 E0
G1 Z0.350 F2700.000
G1 X3.000 Y80.000
G1 F1800.000 E1.00000
G1 X5.000 Y80.000 F90.000 E1.29103

the extruder  temps are 200?? but commented out, so it goes  with the cartridge temp?
no bed temp.
I'll use the resetter code to read that.

Anyway before i go the repetier firmware replacement route is there a way to change the
offline gcode file and restart the print. Not in the lcd menu.

during the autocalab run i measured 80 on a thermocouple (2 below the lcd temp)
the bed heat up did go to 90 on the lcd for a print run.
that temp sticked on my many previous prints, but i wonder if it goes down now as the print runs. i'll measure this later.

but on the changing the offset print gcode file can we pause the print and change the file
(before the 3 min timeout) ,  or is it already in the buffer? i am about to wire up a wifi sd card to the micro card
wires  on the board, if that can be done and micro/normal sd cards have the same interface (no micro wifi cards locally).

I am asking this as i have not yet thrown out xyzware.exe