Perhaps, but have you actually tested this for yourself?

PLA is extruded at 220C in my Prusa beastie. Once the filament is slapped on the model, I probably want it to to fuse to the previous layer really well and then cool really fast and become stable.

We need to provide working and results rather than “I think that”. My printer is quite close to a very large double doors to outside, which open and shut as required.

It’s complicated but PLA is bio-degradable … eventually. Not months but years. That’s much better than the horrors you see on Blue Planet II.

Plus humidity is bad for your filament.

I keep on hearing this but it does not check out for me.

I have a Prusa 3S+, self assembled. I do not do a great deal of printing and go through phases. I did a flurry of prints during the pandemic and then it rested idle in our rather cold and slightly damp study for a couple of years. When I bought it, it came with a spool of silver Prusament which worked nicely. I then bought a spool of “Sunlu” filament (Chinese firm off of Amazon) and then a box of 10 colours of the stuff.

I recently got the printer out and updated the firmware, re-calibrated it and so on. I’ve done several prints with filament that has been open to the environment for at least two or three years and its fine. I have done a print using some transparent filament which was unopened and that was fine too. The unopened stuff was vacuum shrunk wrapped so could not possibly be damp. The opened filament was stored in the original cardboard box in a slightly damp and unheated room.

For me the main issues for a decent print are:

• Adhesion on the plate. I actually used glue for a print for the first time recently
• First layer calibration. If the first layer is wrong, the rest is wrong. You need to get the right amount of “squashing” to get a smooth bottom
• Always clean the plate between prints - a squirt of EPA and a decent rub with tissue whilst the bed is heating up does the job
• Keep the guide rails lubricated - Mine whined that all three axes were too tight or just wrong and yet the Prusa app to check belt tightness and forum and wiki advice said it was fine. Any engineer will tell you to lube up when in doubt - do it! X, Y and Z.

I will try repeating a challenging print with filament that is way older now and see what happens. I printed a couple of tank models in red around four years ago. Both involved their turrets with the barrel facing upwards - that’s a lumpy cylinder about 4cm long and 2mm wide.

I have seen some notes about PLA being hydrophylic (absorbs water) on the Prusa website’s official advice but I don’t personally think it is an issue and people are probably missing another factor or factors that is fucking up their prints. I think the filament dampness meme is “cargo culting”.

PLA is heated to around 220C whilst being extruded so any water will steam off very quickly as water vapour - which is not even “wet”, well before worrying a print job.

PLA is touted as bio-degradable and it is … eventually. It is extremely stable, despite being derived from corn starch. It really doesn’t seem to care about a bit of water hanging around. That’s why I can print new hinges for a plastic garden storage thing to replace the original ones and they last through winters and summers in the UK.

So, if you think moisture is an issue for PLA filament used for 3D printing, why not do some experiments and then decide for yourself.

I’m happy to be proved wrong.

So where do you put the rest of your helices on a cylinder or cone, in 2D? In Flatland a screw or bolt becomes a circle with a short hair. The whole point of “leftie loosy” is to try to help with reality as we perceive it.

Try it the next time you are underneath a car wielding a socket spanner with a taped on extension thingie that you jury rigged whilst trying to shift a hex nut at 45 degrees to reality that you cannot see, with oil dripping in your eye. Obviously the oil is a mix of the 30 year old native stuff loosened up with the WD40 that might break the rust lock.

I suggest you do think abut things in 3D and don’t forget the other dimension (time). That WD40 needs time to break the rust lock.

“Leftie loosy” isn’t for keyboard worriers - its for engineers and technicians, plumbers, and the rest and obviously for DiYers.

When you are knackered and pissed off and you need to shift a fucking nut or bolt or whatever, you need incantations to get you back on track.

Have a chat with some plumbers, builders, chippies, sparkys or engineers - assuming you are not one already. I think “leftie loosey …” is well known in the UK.

They are not a circle unless you have some really odd bolts or screws! I suppose a bolt looks like a circle in “Flatland” but we live in 3D space with time as a fourth dimension that we can directly perceive.

A screw or bolt and the rest are, roughly speaking, a cylinder with a helical thread on it. They also have a “head” or similar which acts a stopper. You can model all of them as a bolt. We use a spanner, wrench, fingers, screw drivers, drill drivers, scissors, whatever to do the tightening or loosening. You can model all those tools as a spanner (wrench). We need some final mental contortions to make this slightly rigorous: The spanner (wrench) is always considered as being at 12:00 on an imaginary clock and we have to assume that our bolt moves away from us for “tighten” and towards us for “loosen” and I suppose we should also require that we are looking at the “face” of the notional clock and not its obverse!

Now it should be obvious how the rule works. Turn the spanner to the right and you tighten the bolt, turn it to the left and you loosen it.

OK that lot is not very helpful when you are under a sink or in a roofing void performing strange contortions. Try holding up one of your hands and pretend you are holding a bolt or the head of a screw. Clockwise turns will tighten and anti clockwise will loosen. You might use “leftie loosey …” to bootstrap: “clockwise tighten”. It becomes even more interesting when you are trying to work out which way to turn a bolt or whatever when you can only feel it and when tightening actually moves it towards you.

Think about a bolt running through a wheel with the head towards us, say on a very simplified bicycle. Move the bike to the right, and hence the wheels turn clockwise. Friction should cause the bolt to tighten. If you change the design and put the bolt in on the other side and now forwards for the bike is to the left then you will loosen the bolt and that will be dangerous. Now change the design to a bolt with a nut and washers etc and it rapidly gets complicated!

Also, please note that some bolts have reverse threads to the norm. On a garden strimmer the tightening knob that holds the spool on is often a reverse threaded bolt. That’s for similar reasons to the bicycle wheel thing I mentioned earlier.

I’ve just spent ages and a lot of words to try and persuade you that this has bugger all to do with autism. I think that your error was really to do with not thinking too deeply about the real issue and focusing on the wrong thing. We all do that, extremely often, regardless of where we are on the spectrum.

I hope that you see that considerations with regarding helical threads on a cylinder or a tapering cone (but not circles) can be quite complicated and that’s why sometimes we all need some silly rules to get us through the every day ordeal of dealing with them.

Now, would you like a chat about circles … 8)

La derecha oprime y la izquierda libera

I just knew that would be Spanish, without being able to speak more than a few words. It works far better than our effort and is both a sardonic and satirical political comment.

Well played Spanish if that really is the equivalent in common usage. Our effort sounds like it was invented by a young child whilst responding to a BBC quiz.

There are so many options it is almost impossible to know where to start!

Which distro is the VM running (is it even Linux)?

If you want the VM to use the host’s VPN then you will need some routing and perhaps NAT/masquerade. This is non trivial to sort out. Can the VM have its own VPN connection to your supplier?

You are starting to reach the point where VLANs/subnets and separate routers (real or VM) may be required. Depending what you use as your ISP router, we might be able to get a solution together - so what model is it and do you have any switches?

Please do a little research before trying random stuff. After checking to see if you are actually using the iwlwifi module, why not find out a bit about whether the mentioned param. is available to you and what it does:

Am I using the module. If the output from this is blank, then no:

$ lsmod | grep iwlwifi
iwlwifi               622592  1 iwlmvm
cfg80211             1331200  3 iwlmvm,iwlwifi,mac80211

Also verify with lspci -k as above:

$ lspci -k | grep iwlwifi -A2 -B2
        DeviceName: WLAN
        Subsystem: Intel Corporation Raptor Lake PCH CNVi WiFi
        Kernel driver in use: iwlwifi
        Kernel modules: iwlwifi
00:15.0 Serial bus controller: Intel Corporation Alder Lake PCH Serial IO I2C Controller #0 (rev 01)
        Subsystem: Hewlett-Packard Company Alder Lake PCH Serial IO I2C Controller

# modinfo iwlwifi
   ...
parm:           swcrypto:using crypto in software (default 0 [hardware]) (int)
parm:           11n_disable:disable 11n functionality, bitmap: 1: full, 2: disable agg TX, 4: disable agg RX, 8 enable agg TX (uint)
parm:           amsdu_size:amsdu size 0: 12K for multi Rx queue devices, 2K for AX210 devices, 4K for other devices 1:4K 2:8K 3:12K (16K buffers) 4: 2K (default 0) (int)
parm:           fw_restart:restart firmware in case of error (default true) (bool)
parm:           nvm_file:NVM file name (charp)
parm:           uapsd_disable:disable U-APSD functionality bitmap 1: BSS 2: P2P Client (default: 3) (uint)
parm:           enable_ini:0:disable, 1-15:FW_DBG_PRESET Values, 16:enabled without preset value defined,Debug INI TLV FW debug infrastructure (default: 16) (uint)
parm:           bt_coex_active:enable wifi/bt co-exist (default: enable) (bool)
parm:           led_mode:0=system default, 1=On(RF On)/Off(RF Off), 2=blinking, 3=Off (default: 0) (int)
parm:           power_save:enable WiFi power management (default: disable) (bool)
parm:           power_level:default power save level (range from 1 - 5, default: 1) (int)
parm:           disable_11ac:Disable VHT capabilities (default: false) (bool)
parm:           remove_when_gone:Remove dev from PCIe bus if it is deemed inaccessible (default: false) (bool)
parm:           disable_11ax:Disable HE capabilities (default: false) (bool)
parm:           disable_11be:Disable EHT capabilities (default: false) (bool)

sysfs is a pseudo filesystem with lots of info in it. cat the files here:

$ ls -l /sys/module/iwlwifi/parameters/

… to see what your current values are set at. You can install sysfstools and run this for a neat report:

$ systool -vm iwlwifi
Module = "iwlwifi"

  Attributes:
     ...
  Parameters:
    11n_disable         = "0"
    amsdu_size          = "0"
    bt_coex_active      = "Y"
    disable_11ac        = "N"
    disable_11ax        = "N"
    disable_11be        = "N"
    enable_ini          = "16"
    fw_restart          = "Y"
    led_mode            = "0"
    nvm_file            = "(null)"
    power_level         = "0"
    power_save          = "N"
    remove_when_gone    = "N"
    swcrypto            = "0"
    uapsd_disable       = "3"

This is from 2004: https://www.trustedreviews.com/reviews/ibm-thinkpad-x31 It will chew amps (electricity). Recycle it as best you can. Grab a modern box instead.

Unless sparks are free where you live, this beast will become a liability very quickly.

I run (one of three partners) a small IT company in the UK. I’ve always Linuxed since around 1998. After messing with RedHat, Mandrake, Yggdrasil and others I settled down and ran Gentoo for many years and then Arch for some more.

I’m gradually dumping the Windows servers and replacing with Linux based beasties. We are also in the throws of replacing VMware with Proxmox.

I also have a pretty decent Kbuntu based desktop/laptop effort. I’ve done Windows client deployments in the 1000s so I have quite a good idea about compliance etc. An Ubuntu based box can run several AV solutions, secure boot and full disc encryption. Buzz words perhaps but also audit points and will get you over the line for Cyber Essentials Plus (UK).

Libre Office works for me and I used to teach office suites in the 90’s! Things have moved on since but a decimal alignment stop is a decimal alignment stop today too (do you know what that means?). I run our Exchange system, and I migrated it from GroupWise back in the day because the kool kids “required” it. Anyway, Evolution with EWS will get you full functionality for a client but with far less faff.

I’m taking my time. I already have at least two employees who are dyed in the wool Windows officianados begging me to migrate them to Linux. I will but it takes time. For example - “drive mappings” or in English: Remote mounts.

CID - https://cid-doc.github.io/ . This is an easy to add Windows compat thing. Its rather good. For static desktops its fine but for laptops that move around a lot it can be hard to get the file system mounts working again quickly in a dynamic environment.

CID uses a PAM mount based system and in the past I used another one (autofs I think). However it seems to me that mounts are not dynamic or responsive enough. In the end it is Samba and that might need some fettling as well.

As I said earlier, I’m taking my time (I’m an engineer) but be assured that Linux is quite capable of driving your desktop.

I usually do Arch myself these days and spent many years with Gentoo. So I’m not too terrified of breakage!

I am putting together a Linux distro strategy for my company. I am the MD of a very small IT company in the SW of England. I already have my office manager asking me to liberate her from Windows! I recently had a techie asking me to help his transition! This is organic stuff and not pushed down by me. The techie is a dyed in the wool Azure lover.

I am used to being patient. It took me roughly five years to get a helicopter company that I worked for back in the day (late 1990s) to use DHCP properly - ie let them “roam free” and let DDNS pin them down. Sounds a bit ridiculous until you encounter “enterprise” grade nonsense.

I have set up laptops with most of the usual suspects and tried them out. However, I have to comply with Cyber Essentials Plus which is a UK standard. It is fine but rather Windows n that 'centric. That means I need full disc encryption and anti virus (AV) and Secure Boot. I got away with ClamAV in the past but ideally I get cross platform and that means ESET for AV/web etc. I use the usual Linux FDE.

I also need to join an Active Directory until I have got rid of AD! Oh and there is Exchange.

https://cid-doc.github.io/ - AD and Evolution with the EWS addon for Exchange.

So I dive in with Kubuntu after trying Rawhide and all sorts. Ubuntu is flexible enough whilst being stable enough for me. For example, Kerberos is screwed for the Firefox snap. I need Kerb for auth to my corp websites such as our wiki. Mozilla does a PPA - I dump the built in FF snap and use the Mozilla blessed PPA. All documented and all controllable in an enterprise sense.

Closed In Directory (CID) is a configuration for Linux boxes joining into the MS world. Its a super piece of work, getting Samba, krb etc all working together well, and with a GUI. You can run scripts from your DC for that GPO feel with it.

My needs are a bit more corp than your gaming shenanigans but my notes might help you decide what you want, what you really (really) want (zigazig … ahhhh!)

Ubuntu PPAs are a bit like the AUR for Arch … well you have to decide what you really want. You could start from scratch: https://www.linuxfromscratch.org/

Bizarre article: “Recently, Linux-based firmware has emerged as a powerful alternative”

I have a stack of Dell OS9 switches in my computer room - they boot BSD. I have sold and set up Dell OS10 switches - they boot Debian … on the control plane. To be fair they can run quite a few OS’s on the control plane. On both, you can switch to a shell (BASH) and fiddle with Ansible and the like or you stick with the usual interface.

They are not glorified PCs! Frames and packets pass through some very fancy electronics and some very specialized memory (CAM - Content Addressable Memory) is employed for certain tasks. The manuals for these beasts run to 1500 pages.

I also have a large fleet of pfSense and VyOS routers and a Mikrotik or two and a slack handful of Fortiwotsits, oh and a Cisco thing or two and some others. pfSense is BSD and the rest are Linux. The Fortis are a bit more like modern switches with their own rather odd and twitchy way of doing things, backed up with some fancy and not so fancy hardware.

I have also played with all of the distros mentioned: Tomatoe/DD-WRT/OpenWRT and they are great for cheekying up a rather rubbish ISP provided router. They are also great for running on budget gear. They are basically superb for budget conscious consumers that are capable of reading some very decent docs. Prosumer is the term, I think.

Anyway, this article is rather odd and is basically filler. The section titled: “Case Studies and Real-World Examples” is a contender for fluff of the month.

“I understand that Canonical has every right to make the decision about their product.”

That seems fair. There are loads of distros available so why not try something else if you don’t like Ubuntu?

Linux and other mainstream Unices such as FreeBSD or OpenBSD int al (that’s not something I ever thought I’d be able to say a few decades back) are not Windows or Apples or whatevs. You do you and not them!

If Ubuntu fails to scratch your itch then move on. Debian is the upstream for Ubuntu so you’ll probably be fine with that instead. There is loads of documentation for Debian via the wiki etc and of course most Ubuntu docs will apply as well.

I (my little company) employ a bloke to support https://www.uzerp.com/ - we use it ourselves and ditched Sage (yay!)

If you fancy it then give us a shout - it is open source - you get it for free but our time is costed if you need assistance.

That is the Open Source Covenant

I think we might be writing at cross purposes. The system you had for your mum obviously worked effectively for you and that is the important thing.

POTS provide(s|d) a fixed point of reference - your address is registered against the number for 999 etc; it provides power for a handset or device; Its been like that for a lot of decades! These are cast iron guarantees. A POTS line has guarantees, enshrined in UK law, that mobile etc does not have. POTS is circuit switched (well it was) which means there is a physical path between the ends for the duration of the conversation.

So, by old school, I mean that you currently have important guarantees about telephony in the UK that will evaporate in future. In 2025 or so, we in the UK will have finished migrating from our old school POTS copper lines and will enjoy our smart new SoGEA lines instead. Single Order Generic Ethernet Access. Instead of an emulated circuit switched line we will use VoIP across the entire country. Nothing wrong with that but it probably won’t have the guarantees that POTS had.

Red Care is no more - BT have dropped it on the floor as of Feb this year which may indicate that things are not well with our future comms promises. The general system that Red Care was one product of is still available.

This is the important point: Promises (in law) that we used to be able to rely on for comms may (will) be binned.

In the UK at least, the POTS (Plain Old …) copper phone lines carry an electrical current as well as signals and can power the handset. There are certain guarantees about this so that in an emergency your phone will still work so you can dial 999 (our original emergency number) or 112. Our fire regulations require something like 30 minutes before things should start failing. In the real world, you get out immediately and use your mobile.

We have an emergency alarm monitoring system used by businesses. Its generally known as “Red Care” which was a brand run by BT (British Telecom). You have a small device connected to a phone line (and powered by it) and it will monitor your fire detectors and building access control systems and a 24 hour manned monitoring centre will notify you in the event of an emergency. Nowadays, these devices will use your wifi and internet connection. Sometimes: old school is best.

Which distro do you use? Ubuntu, Debian, Arch and Gentoo have packages and I’ve no doubt that most others do too. On Linux you should not have to go to random websites and download stuff and faff around - use the built in distribution packages. If you are not sure what you’ve got try this at a command prompt and read the output:

$ cat /etc/os-release

As a last resort, you can run tcpdump on nearly anything and dump to .pcap, transfer that and then open that in Wireshark. Note that modern Windows has a OpenSSH client and server available so getting files around via scp is a doddle. Windows can even do NFS too and there is of course Samba - but CIFS/SMB can be tricksy.

Errm, Wireshark. Please bear with me.

Wireshark is a shining example of an open source project completely and utterly crapping on the closed source competition. As a result we all benefit. I recall spending a lot of someone else’s money on buying a sort of ruggedized laptop with two ethernet ports to do the job back in the day.

Nowdays, I can run up a tcpdump session on a firewall remotely with some carefully chosen timings and filters and download it to my PC and analyse it with Wireshark.

OK, all so convenient but is it any use?

Say you have a VoIP issue of some sort. The PCAP from tcpdump that you pass to Wireshark can analyse it to the nth degree. Wireshark knows all about SIP and RTP (and IAX) and you can even play back the voice streams or have them graphed so you can see what is wrong or whatever. That’s just VoIP, it has loads of other dissectors and decorators built in.

So what?

The UK (for example) will be dispensing with boring old, but reliable, POTS (Plain Old Telephony System) by 2025. Our entire copper telephony and things like RedCare (defunct soon) will go away.

We are swapping out circuit switching for packet switching. To be fair, a lot of the backend is already TCP/UDP/IP that is shielded away from us proles. When SoGEA (Single Order Generic Ethernet Access) really kicks in then the old school electric end to end connection will be lost in favour of packet switching, which never fails (honest guv).

If you are an IT bod of any sort, you really should be conversant with Wireshark.

Mmm first releases! Working from home, its nearly close of play. I know … I’ll update my work laptop.

OK I now have LXDE for a fall back WM so I can read stuff rather more easily than using links in a TTY and switched out SDDM for LightDM - I needed sddm-git to get LXDE to start up. SDDM now simply crashes and dumps core - no idea why. Oh and I have switched to Wayland because X11 no longer works for me. I might put off updating the wife’s laptop for a while, at least until I’ve done my work desktop 8)

I must say its all rather pretty and smooth. Scrolling now has drag and acceleration, which is nice. I’m sure I’ll get KRDC to talk to the sodding wallet so my 100s of RDP connections will work again. For now I’ll call xfreerdp from the konsole. Perhaps I’ll get around to configuring KeePassXC and get around to using that instead. I share several rather large .kdbx with the rest of the firm.