Spyke

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Can I get an F in the chat boys

You can edit the grub config (assuming you're using Linux) and add reserved ranges for the affected physical address.

find the linux boot command and add a memmap=$ argument This tells the kernel to avoid the bad parts.

In your case it looks like a relatively small chunk of bad memory so.. memmap=64K$0x130FE0000

I've used this trick to stabilise systems with faulty RAM and it works.

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Having issues with PETG. Is this bed leveling issue, bed dirty issue, wet filament issue, or something else?

Hard to tell, most of it looks fairly good except a few spots here and there.

That could be grease on the print bed, maybe time to give it a wash? When PETG goes wrong for me, it's this 90% of the time.

I use hot water and a little detergent with a lot of rinsing. Use gloves because even clean hands leave oils behind.

With PETG it's hard to get the first layer right but if it's good the rest of the print generally goes fine.

Molten PETG is very sticky and if you get a bit stuck to the nozzle it can build up, get worse and suddenly take out a bunch of nearby lines leading to gaps in the layer like this.

To counter this PETG first layer should be:

  • Printed very slow e.g. 20mm/s
  • At a higher Z offset than PLA, the plastic should flow out the nozzle and fall onto the bed rather than be squished flat.
  • High bed temperature 80C / 176F
  • Zero or very low fan speed for the first couple of layers

If you can see marks left by the nozzle it's too low. The lines should have a rounded look.

It could also be wet filament, does it make popping sounds when printing?

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Some system load graphs of last 24h

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If you had this much buffer memory what are the reasons to have swap space as well?

Many programs do stuff once during startup that they never do again, sometimes creating redundant data objects that will never get accessed in the configuration its being run in. Eventually the kernel memory manager figures out that some pages are never used but it can't just delete them. If swap is enabled it can swap them to disk instead. It frees up that RAM for something more important. It's usually minor but every few MB helps.

world

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Russian frigate fires warning shots at British yacht in Channel – reports

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In the couples news interview video she said that after the ship hooted 5 times they "altered course 2 degrees, so that they could see we made a deliberate change of course".

That might be a "miss-speak", but it's nowhere near a large enough deflection to let anyone know they have been seen.

If any warship honked at me half way across the channel I'd be turning directly away from them as quickly as possible, under sail or not.

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Is it possible to reuse this defective motherboard ?

The easy version would be to feed it 5V current

You could cut or de-solder the ribbon cables and power the upper board alone connecting the +5V and GND wires on the left ribbon to an appropriate power supply. If the upper board isnt blown you might be able to get it to work.

This kind of two board design is quite common. The bottom PCB is a mixed high + low voltage board that includes the mains power supply with bridge rectifier, transformer and smoothing caps. It sends low voltage power to the upper board via the ribbon.

The upper board is entirely low voltage and has a microcontroller, display, buzzer and the control knob. Sensors and switches in the oven are passed over the ribbon to the controller, and control signals are passed back through the ribbon to the relays on the power board which then switch high voltage power to bulbs, fans, and other stuff.

As long as you don't connect it to mains power it's a safe low voltage in this case, there is nothing on this board that will generate high voltage from 5V. Don't leave it powered when you're not there, low voltage can still burn your house down!

The more complicated version would be to also reprogram the chip

This is unlikely, but you never know. Its probably a custom pre-programmed chip that can't be erased, or at the least it has been locked so it can't be modified or have the software read out. It's possible that it could be programmed in place on the board without de-soldering.

Interestingly the upper PCB also seems to have something that looks like an SPI port (P21) it's possible this controls something in the oven but I doubt it. It could be a programming interface but SPI is not typically used for that, maybe a test interface? Hard to say. (edit on 2nd thoughts it probably is a programming interface)

Someone with good electronics / software skills could replace it with an equivalent blank programmable CPU and program it (with something), but that would be a big project even for experienced engineers. Mostly the lack of detailed info about the hardware usually makes it easier to design something new from scratch than to reverse engineer somone elses design.

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Object proportions are off in the slicer compared to Blender

This seems strangely just a little bit wrong.

As mentioned there's no units on STL files so the slicer assumes millimeters but warns you if it thinks the scaling is obviously not right.

My blender units are meters.

If I just export the default cube from blender (which is 2x2x2) and load it up in the slicer I get a prompt saying the units seem to defined in inches. It's assuming I can't possibly want to print a 2mm wide cube. Do I want to convert it to inches?

If I answer No, I get a perfect 2mm cube, good luck printing that. If I choose Yes, to convert it then I get a cube 50.8mm across. (2x 25.4mm) exactly 2 inches as expected.

Going back to blender, deleteing the default cube and creating another cube but scaled to 0.1m. This time exporting to STL on the export save dialog there is a scale setting: set this to 1000 (to convert from blender 1m units to Prusa 0.001m units). Now the STL is imported into the slicer with no fuss and is exactly a 100mm cube.

It seems I can't recreate your problem.