3d Benchy Question

dc42

@wingtip you may not need to do the side-to-side levelling. The Z motors typically jump by up to +/- 2 full steps during a power cycle. So they only get out of sync if they jump different ways, and only by a maximum of 4 full steps per power cycle. Depending on your Z steps/mm, that may not matter if you only power down and up once.

wingtip

@dc42

but your forgetting it drove itself into the part and started skipping steps.. I would think the best option would be to get z fully homed properly somehow

dc42

@wingtip you could remove any filament attached to the nozzle, then lower the nozzle so that it just touches the print, and use a G92 command to set Z to the same value as indicated in resurrect.g.

wingtip

@dc42
true, but what about my side to side leveling that is certainly now screwed up? This is why i said i knew i could do a single probe hit but that wont adjust the gantry to the offset of side to side level.... Otherwise if you dont do that the nozzle would fine say at y10 and be driving into the print at y300.... I think im going to just have to scrap this and start over when i get more filament.

dc42

@wingtip said in 3d Benchy Question:

true, but what about my side to side leveling that is certainly now screwed up?

If the print is wide enough, you could use M584 to map Z to just one of the motors temporarily so that you can adjust them individually to get the nozzle just touching the print at both sides.

Your chances of resuming the print accurately enough to get a good finished print are not good, but by trying you may learn more about your printer.

Phaedrux

As long as the part is still attached to the bed there's always a decent chance of recovery.

Do you have a machinist block or some other block of metal that you could set on either side of the printed part and use that as a gauge on whether the Z motors have gone out of sync? Just touch the nozzle to it and then compare to the other side. With the Z motor disabled you could even turn them by hand to adjust if needed. With G92 Z you can force Z as homed to whatever height you need. So if you can verify that the motors are even you can set the height at the top of the print and resume.

Was the nozzle leaking because it wasn't hot tightened?

I assume the temp excursion was from taking the nozzle sock and cooler off suddenly.

wingtip

@phaedrux

I do not have any precision blocks. I have already removed the part from the bed.. it gives me a chance to inspect the support material as well... i think i want to tweak it a bit as well to release better. I have already re leveled, done a new heightmap to make sure everything is at least close to being right as can be. gonna do a support test and experiment with those settings and also maybe try printing a new part cooler to solve the other issue of having to set the fan speed extremely low to not upset the thermistor.

In a day or so my shipment of 3 more rolls of white filament should be here.

Phaedrux

@wingtip said in 3d Benchy Question:

I do not have any precision blocks.

Doesn't need to be precision, or even metal, since it wouldn't be used for measurement, just to even up the sides.

It hurts to fail a large print like that, but it was a test print at any rate and it did lead to learning, so all is not lost.

How did it seem to be printing otherwise?

wingtip

@phaedrux

it was printing great except for the leaky nozzle but as long as i was there to pull off the ooze before it could stick to the print it was fine but it was getting old doing that every hour thus me asking if i could pause it without it screwing up the print but it did.... so next time... if i pause and have to temp remove the fans, can i just turn off the heater, then turn it back on and resume once its up to temp? it technically failed cause it exceeded the min/max range allowed due to me fiddling with it.

Phaedrux

@wingtip said in 3d Benchy Question:

if i pause and have to temp remove the fans, can i just turn off the heater, then turn it back on and resume once its up to temp?

Yes. You can.