Chamber fan on after the print shouldn’t cause any problems. It will cool the model a little faster but honestly it doesn’t move that much air.
I’m pretty sure I have the least configuration installed. It won’t let me update to anything newer. There used to be a chamber fan setting in the filament settings (developer mode) but it seems to be removed/moved? I can’t find it anywhere in the latest version.
Do you have the latest firmware. The response I got from Bambu suggested that the change was done in the firmware.
I’ve been printing ABS with BL ABS on stock settings with 0 issues. Printed a bird feeder, new parts for Bento Box, a nut to install a faucet, no fails. Not doing anthing special.
Same here. But it is present in Orca.
Appreciate the tests-
From others investigations here in other threads- I think the issues are pretty directly nailed down to mechanical binding/ thermal expansion. There was mention of the bushings used on the carbon rods- perhaps there are some tolerance issues.
I took my head unit apart and checked the bushings, they seem very smooth when out of the plastic head unit housing. I wonder if its the “clamshell” housing that holds both bushings, tolerance stackup with combined heat deflection might be putting a higher load on the XY steppers.
I reinstalled with a bit of .004" shim between the halves just to see what happens. Print a benchy now starting at a preheated 40C chamber, will see.
My test benchy after disassembly- reassembly of the head unit printed very well.
Start temp 40C, end 45C.
Before the disassembly- reassembly of the head unit, this print failed constantly above 40-42C.
As mentioned in another topic, the tolerance stackup could be an issue from the carbon rod mounts to the bushings in the plastic “head unit” clamshell. I think its possible even a change in assembly- of the order the clamshell screws are torqued might cause issues- i.e., binding the bushing/rods and putting a higher load on them. Once heated, the load is too much for the steppers.
Doing more test prints at “max” chamber temps to see, but I think this might finally be resolved!
@Barryg41 @JonRaymond Printing ASA/ABS and other materials that are toxic during extrusion involve that carbon filter must clean the air chamber, in my opinion the cham fan must run at least at 50%, did you notice the smell when you open the door? This exhalation is toxic.
In my opinion the chamber fan doesn’t meet the requirements to deal with the fumes while printing with ABS/ASA. There are better ways of dealing with the fumes with items like the Bentobox, external enclosures or even whole room filtration. Each person should deal with the fumes to the level that they are comfortable with.
This is due to the over heating of the extruder motor, so at the end of the starting gcode, add gcode command to reduce extruder motor max current by %30 and try. I have solved my problem doing so. Extruding filament never failed since then. Happy printing.
I have posted here on this forum about how I work with the fumes of ABS/ASA.
For me this is a hobby not a job. I dont print everyday and im not in a hurry to get a project off the build plate to get on with the next project.
This is my setup for my print/hobby room and house.
I don’t think we have/had the same issue.
What issue did you have that was resolved by limiting max stepper current for the extruder?
If the extruder motor and the driver over heats, filament flow will not be consistant and even stops for short period of time causing blobs or under extrusion.
Ah ok, yes, different issues. I didn’t have any extrusion issues.
What gcode did you add to lower the current?
Add “M17 E0.7” command at the end of ‘starting gcode’.
Would you happen to know if that’s a percentage or amperage?
As in “M17 E0.7” sets it to 700mA or 70% of max power?
I replaced the carbon rod assembly in my X1C yesterday. I could tell a noticeable difference in smoothness when I had the “old” one out compared to the replacement. The old had tight spots in the middle.
I heated the chamber to 45c and ran a print I had handy for ASA with no issues.
I’m confident I’m finally past this issue!
Happy printing!
Is it just me or does dealing with support absolutely suck. Why does it take 4-5 days to respond at a time?
Gave up trying to deal with support, ordered the spare part myself.
Good call in my opinion. Thats why I did it too, wasn’t worth the time and frustration of waiting through support.
Good luck!