Crusty geek. Retired software developer, aspiring musician. Used Unix way before it was cool.
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Published at
2024-06-04T01:11:37+02:00 Event JSON
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"content": "{\"name\":\"Kernel Bob\",\"about\":\"Crusty geek. Retired software developer, aspiring musician. Used Unix way before it was cool.\\n\\nOnce I built a pumpkin chucker. Another time, I built an LED cube.\\n\\nInterests: 3D printing and making in general, synths (playing and making them), learning the bass guitar (rock, jazz, funk), FPGAs and electronics, pinball. I spent 40+ years obsessively coding and studying computing, but that interest has finally cooled.\",\"website\":\"https://chaos.social/@kbob\",\"picture\":\"https://assets.chaos.social/accounts/avatars/000/111/219/original/b264b0a615f9898d.gif\",\"banner\":\"https://assets.chaos.social/accounts/headers/000/111/219/original/5090f4a5145424eb.png\",\"nip05\":\"[email protected] \"}" ,
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Last Notes npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob Does that mean a future RedHat Enterprise release will pick up Valkey too? npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob Stupid Fastener Tricks, Episode 87. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob Unrelated, but also visible in the first photo above, the purple ("aquamarine") hexagonal tube in the lower left is for the LED wiring. The LED power supply will be underneath, and one strip of LEDs will be in the enclosure lid. Power and signal will run through that tube and up through the leg to the lid. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob The cable passes through the foot under the leg to another MATE-N-LOK connector inside the enclosure. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob It will go outside the enclosure on the back side, as shown here. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob Here's the power supply mount I came up with. The upper bracket slides up, and the power supply can be removed without tools. That way I can take the printer to the bench without a lot of hassle. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob Reposted with a useful alt text, compliments of https://www.explainxkcd.com/wiki/index.php/2233:_Aurora_Meaning npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob I adjusted a few dimensions, and the second try fits nicely. There's just barely room enough (I hope) to bend the wires around and connect them into the jack. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob It took the entire day, like 12 hours, just to model this power supply cover. It doesn't look that hard, but it took a long time to collapse the infinite possibilities down to this one. It's on the printer now; I'll see if it fits in an hour. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob I plan to put the printer's power supply outside the enclosure attached to one table leg. The bottom of the power supply will fit into a cradle, and a cap will slide down over the top of the PS to keep it stable. To remove, I'll just slide the top up and lift the PS out. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob I am still working on the printer enclosure when I'm not traveling. Today I made a test piece that slides along an IKEA LACK leg. I put steel dowel pins on two sides for a tight but low-friction fit. It works better than expected. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob ??? This was supposed to be a video. It looks like I just uploaded a still. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob I've solved the problem of mounting LEDs to the underside of the LACK table in my printer enclosure. I'm very happy with the result. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob Here's the new prop arm and the tool that squeezed it together. The pieces aligned pretty straight but not perfect. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob This joint locks two PETG pieces together far better than it has any right to. I had to force the pieces together with Knipexes. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob I redrew the prop arm to move the bracket to the corner of the table. Numerous picky little changes later... npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob Now that we know where the solid parts are inside the table, we see that most of the screws in Prusa's enclosure design are screwed into air. Hmmm... npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob Calling it wood was far too generous. As I expected, there's a block of sawdust-glue porridge in the corner just slightly bigger than the leg. It's hard to measure in there, but it looks like it extends about 60mm from each table edge. When I drill the hole for the cable, I can get a better measurement. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob I suspect most of you, like me, get to see the insides of IKEA furniture far too rarely. So here's a LACK table undergoing surgery. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob Color change! And now I can go to bed. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob The hinges have bar magnets to hold them closed. That's from Prusa's design, but I moved them to give them about 60% more mechanical advantage and increase the closing force. They feel very satisfying to operate, but I won't know for sure until the doors are attached. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob Here's the other end of the LED channel. It's open on the bottom for wires. I can drill a hole through the table anywhere that is hidden by the square plate and doesn't interfere with the screw holes. I think I'm using JST SM connectors, so the hole needs to be that big. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob The orange post on top is not a separate piece. I did a layer height color change. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob The purple piece is the end cap for the LED channel. It press fits into place. The wires will feed into the channel from the other end. This will probably be one of the trickier bits to assemble when sliding this down onto all four legs at once. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob The bottom of the slot between the rails is 0.2mm wider than the top, so the gridfinity tray snaps into place and isn't coming out. (I can push it out from the bottom.) I tried 0.8mm on the first iteration, but I couldn't force the tray in. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob This is part of the top rail where the Gridfinity bins go. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob I'll also have an IKEA MOSSLANDA shelf on the front with another 2x12 #gridfinity slots. My old printer enclosure has that, and I like it a lot. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob As promised, there's just a little #gridfinity storage under the lid. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob That's darn good graphics too. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob Wheee! Look at me! I figured out how to get two hinges and a door to move in sync. (Revolute joints for each hinge pin, rigid joints between the pieces, then let F360 figure out the rest.) Anyway, the LACK printer enclosure continues slowly. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob Yeah, so I started over. Now I'm tying components together with rigid joints and tying them to points on sketches whose measurements use parameters. This is the measurement I tweaked that blew my model up last time... npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob I also have grouped things into components incorrectly. For example, I made the two halves of a hinge into one component, because the parts have to mate, and they share sketches and dimensions. But to open the door, the moving part has to be a separate component. I feel like I'm missing something basic. npub1qp89j2arjdptmcyh2lnddx4jfmd8kpm5xrfrec5ytr8hjpppx4aqgqjtng Kernel Bob I do not understand components and coordinate systems in Fusion 360. Because of that, I may have lost the design I've been drawing all week.
