Issue with board and bed  

Re: Issue with board and bed

During playing with new firmware, I had a bed and nozzle crash event and a deep scoring of the PEI in the top right of my bed. Not an important place for most of my 3D prints. I do however have a spare sheet of PEI and adhesive, just in case I need it in the future.

Re: Issue with board and bed

Christopher

When you turn on the printer the position of the nozzle is determined to be 0,0,0 (X, Y, Z) and you cannot move the nozzle so that its position is negative (there are minor exceptions to this).

The only command which will move the nozzle to effective negative positions is a home command.

If you have not already, can you please download and install the 3.0.5 firmware and run the X/Y calibration. You will also have to re-align the Z axis by moving to the top of the frame, but this is included in the XY cal.

Peter

Re: Issue with board and bed

We have already updated to the newest firmware.

Re: Issue with board and bed

Wow.

I just realized now why there were divots in my PEI bed straight from the factory.

Shame on the guy who assembled my printer. Shame.

FYI, I think it's retarded to probe at full extrusion temperature. For starters, unless you're actually probing *WITH* the hotend, the temperature doesn't really matter.

Second, at full extrusion temperature, the hotend oozes, so it leaves boogers all over your print bed PLUS it might run into the print bed and skew your results.

I modified the gcode to warm the hotend up to a "holding temperature" prior to probing. It's a temperature hot enough to get things started, but cold enough to prevent ooze and bed damage should it come in contact with it. This is typically around 170C, or 150C for flexible filament.

Once the probe is finished, I raise up off the bed, THEN set full extrusion temperature and start the print.

Re: Issue with board and bed

Yes, unfortunately with a fixed probe, you either probe cold with the possibility of a blob of plastic on the end of the nozzle causing issues or hot and trust that the probe will "see" the bed insert.

Some forum members implemented a servo-lowered probe with the Mk1 which now seems like the better option (in use at least; maybe more difficult with build though).

I still believe that this printer represent excellent value-for-money and produces superb quality prints, so I can't complain too much!

Peter

Re: Issue with board and bed

I modified the gcode ...
Would you please post it here? Just copypaste into "Code" element. Thanks.

Re: Issue with board and bed

I modified the gcode ...
Would you please post it here? Just copypaste into "Code" element. Thanks.

Pretty much looks like this. Majority is the stock code, which looking over has... redundancies.


M83 ; extruder relative mode
M104 S170 ; set extruder holding temp
M140 S[first_layer_bed_temperature] ; set bed temp
M190 S[first_layer_bed_temperature] ; wait for bed temp
M109 S170 ; wait for extruder holding temp
G1 E-1 F1000; retract to keep from oozing while probing
G28 W ; home all without mesh bed level
G80 ; mesh bed leveling
G1 Y-3.0 Z10 F1000.0 ; go outside pritn [sic] area
M104 S[first_layer_temperature] ; set extruder temp
M109 S[first_layer_temperature] ; wait for extruder temp
G1 Y-3.0 Z0.1 F1000.0 ; go outside pritn area
G1 X60.0 E5 F1000.0 ; intro line
G1 X120.0 E7 F1000.0 ; intro line


Note that I'm still running the 3.03 firmware that shipped with my printer.

I just put a new divot on my new PEI sheet tonight testing out a new feature.

Words cannot describe how angry I am with this firmware. It is awful. It doesn't behave in a sane way.

Trying to "stop" during probe can result in disaster.

Running M80 (bed leveling) seems to hose the USB connection.

If your hotend slams into the bed (because you tried to stop during M80, which should really be G29), you have to try to reset then wait for it to come all the way back up before you can jog back into the settings to raise the hotend off the bed, by which point your bed has already been damaged.

I won't be using OctoPrint with this printer anytime soon it seems. This was something I was worried about -- I suspected that the inclusion of an LCD and jog dial would cause PR to not take USB printing seriously.

Re: Issue with board and bed

gz1

You need to add M80 to the "long running commands" in OctoPrint.

OctoPrint works very well with this printer as long as you have latest firmware and you don't press the "Home Z" button.

Peter

Re: Issue with board and bed

Trying to "stop" during probe can result in disaster.
I'm using 3.0.3 (just because there is no newer stable release and I don't trust beta or RC) and stopping printer by menu command anytime (not only during autoprobing) can result in disaster. Fortunately I learned to be quick on reset button and now I'm using reset button instead of menu command "Stop print". It cost me only few dents in PEI surface. 😉
But, with all respect to PR, it is a real shame to ruin good impression of overall great product by such silly software bugs.

Re: Issue with board and bed

gz1

You need to add M80 to the "long running commands" in OctoPrint.

OctoPrint works very well with this printer as long as you have latest firmware and you don't press the "Home Z" button.

Peter

Oh thanks. I had forgotten about the long running commands. Its natural to add G29 to that list, unless your G29 is called G80 of course...

Re: Issue with board and bed

What can I say, other than 😀 😮 😀 😮 😀 😮 😀 😮 😀

Peter

Re: Issue with board and bed

Hrm.

FYI, adding G80 (which is the mesh leveling command in my gcode) doesn't fix the problem, even if I increase command timeout to 60s.

It does this:

Send: G80
Recv: 80:ok
Recv: echo:endstops hit: Z:-0.79

And then no more commands are accepted. At least with the 3.03 firmware.

Re: Issue with board and bed

Hummm Thinking about it, I can't remember when G80 was introduced (or rather advised to users) and I don't have 3.0.3 source to check it out.

I do have a feeling in my waters that 3.0.4 beta was the one which introduced that (but as usual, I could well be wrong).

Knowing that you have a reluctance to upgrade to better, safer and more reliable firmware simply because it is labelled "beta" or "RC" it is difficult to know where to go from here, other than to say that 3.0.4 beta and 3.0.5 RC were both "finals" and 3.0.6 will be with us shortly.

Peter

Re: Issue with board and bed

Label doesn't concern me, just haven't had time to review the changelog, diffs, or read user experiences on new firmwares. And my level of distrust in the firmware right now means I need to do these thing before switching.

Re: Issue with board and bed

Well, 3.0.6 RC is now available. You need to start looking at the changelogs otherwise you will get left behind...

My printer is busy at the moment; I might have a look in the morning.

Peter