Fighting with computers

If your HP LaserJet P1102 prints perfectly on Linux but outright refuses to print on Windows because of an "unofficial" toner cartridge, the hardware is not the problem. The issue is HP's status monitor software actively blocking the print spooler in Windows. While you could theoretically bypass this by routing a Linux CUPS server through WSL, there is a much cleaner native solution: strip away HP's bloatware and install the raw, host-based .inf driver directly. Here is the exact procedure to revive your printer. 1. Extract the Raw Driver HP often hides basic drivers behind their "HP Smart" app. We need the raw files. Disconnect the printer's USB cable from your PC. Go to the HP support site, manually change the OS version to Windows 10 (64-bit) , and download the full software package ( .exe ). Do not execute the file. Running it will install the HP cartridge-monitoring software. Right-click the .exe file and use 7-Zip or WinRAR to Extract its conte...

It is often said that reality surpasses fiction (I reckon Mark Twain's quote was "Truth is stranger than fiction, but it is because Fiction is obliged to stick to possibilities, Truth isn't."). That was definitely the case yesterday, with a total solar eclipse in some areas. As you can guess, I was lucky enough to get a first row seat for the event.  We walk up a mountain to a spot we previously checked and wait for the moon to slowly but surely block the sun's light. It took approximately one hour, and it did not look very different from a sunset; the difference, of course, was that the sun was not setting over the horizon but was just getting dimmer and dimmer. But at 20:30 local time, the sun was fully blocked, and only a few light rays were visible all around the dark moon. That lasted a bit more than one minute of wonder, some of it I wasted fighting with my camera zoom till I got a couple of not-so-good pictures. But the scene looked like a sci-fi movie. Rea...

Well, I have gone down the rabbit hole of applying IA to solve free-form 2D nesting problems, but the results weren't what I expected.  However, I have learned a lot of things in the process, and created some software you might find useful, such as this  packer , which has nothing to do with AI (initially), but it is a basic Left-Bottom First packer.  The AI part comes in when you provide it with a somewhat "intelligent" parts sequence. And there, my friend, is where many different attempts and hours of AI training went. Let me explain what I did and how I did not accomplish much in the process: I had a collection of 2D part geometries and the results of a professional nesting tool applied to them. I thought I could use that to teach a model how to tell a dumb LBF to do better by either providing the optimal part sequence and/or rotation angle. I used different approaches to that, but I underestimated my ability to mess things up, so I ended up with six different transfor...

 This is just a reminder, as I seem to stumble with the same rock every now and then. The problem is the keyboard configuration and the sometimes quick time window to perform a cloning operation. All of it leads me sometimes to a number of failed attempts until I got it right. The culprit? Having passwords that use symbols that are mapped to different keys depending on the keyboard language selected. And no, selecting the UI language has nothing to do with that.  So the common symptom is my host system no longer allows the connection to the SMB share I use to store the images to (or to retrieve them from). So I first worry about potential incompatibility of the SMB versions and authentication modes. Then I think there might be I am not remembering a not so often used password right. And, eventually, I realized that the password I am typing at the terminal that I cannot read as it is not echoed back most likely contain the wrong symbols as I did not choose the right keyboard (w...

This document summarizes some of the usage of the pymeshlab library. Unfortunately, the library has been through severe changes over time, so some methods are renamed and filter calling conventions are shifting too, which makes AI and humans mad :-) Core Concepts The MeshSet The MeshSet is the primary container for handling multiple mesh layers and applying filters. ms = pymeshlab.MeshSet() Mesh Objects Individual meshes within a MeshSet . They contain the geometry and attribute data. mesh = ms.current_mesh() Basic Operations Loading and Saving # Load a new mesh into the MeshSet ms.load_new_mesh("input.stl") # Save the currently selected mesh ms.save_current_mesh("output.stl", colormode=False) Layer Management # Get total number of meshes in the MeshSet count = ms.mesh_number() # Select a specific mesh by index ms.set_current_mesh(1) # Delete the currently active mesh ms.delete_current_mesh() # Control visibility (often used for merging) ms.set_cu...

  I recently encountered an unusual error when trying to pass certain filenames to a Python app as inputs. After a moment, I realized the troubled ones had a comma in their filename, which should be totally valid, isn't it? It turns out Windows Batch ( cmd.exe ) is built on legacy rules where the comma ( , ) , semicolon ( ; ) , and equals sign ( = ) are treated as delimiters, exactly like a space . When you drag a file named Data,Project.txt onto a .bat file: Explorer sends the raw string to the command processor. CMD sees the comma and splits the filename into two arguments: %1 becomes  Data  and %2 becomes Project.txt . The comma is deleted from the stream entirely ( 🤦 ). The Solutions: From Hack to Hero Method The "Ugly Hack" (Batch) The "Robust" Way (Shortcut) The "Pro" Way (PyInstaller) Setup Create a .bat file with %* Right-click .py > Create Shortcut Compile script to a standalone .exe The Trick python script.py "%*" Edit ...

I usually have Linux server boxes with only power and network cables. That works well most of the time, except when: You need to install the operating system. You screw up and render the system unresponsive, even after a power cycle. Then you realize you need to move a keyboard, mouse and display to that machine to see what is going on, and hopefully fix it. Not a big deal if you are in the next room, not ideal if you are in another city or country.  So after watching Dave's video , I decided it was time to start using these devices for my own good. And I learned a couple of interesting things while reviewing the features: There is an optional add-on, called Fingerbot, that can be used to act on a push button, like the reset or power button of your server remotely. That way you can even power off a misbehaving server, or power it back on after powering it down. That is especially useful if Wake-On-LAN is not possible at the moment (most computers do not come with that enabled). The...