Category Archives: things that don’t work

Belt and suspenders

I really like the idea of Yourduino’s RoboRed: gobs of 3-pin headers for almost all the arduino I/O pins, with n-tuplicated power and ground connections. Heavy-duty regulators built in for two amps of 5V and half an amp of 3V3 … Continue reading

Posted in things that don't work | Tagged , | 2 Comments

I need a better CAD program

Or to get really good at creating polygon coordinates in my head. My new fan duct is an improvement over the old one, which was an improvement over a bare fan with a dab of packing tape. (I made something … Continue reading

Posted in making, things that don't work | Tagged , | 5 Comments

I’m a little puzzled by these loops

(PET+, 250 degrees, .25mm layer height, 60 mm/sec, no additional acceleration control) I think I know what most of the other issues are — the blebs are from not retracting enough on layer change, the ringing is from running too … Continue reading

Posted in things that don't work | Tagged | Leave a comment

You get what you pay for, yet again

Dunning and Krueger strike again. I thought I knew the retail PC industry well enough, just because I’ve chatted with so many of the people who invented it. But times have changed. This spring I bought a refurb windows laptop … Continue reading

Posted in probably boring, things that don't work | Tagged | 1 Comment

One step forward, multiple steps back.

The good news: after 7 months I finally got the metal hot-ends for my printrbot metal plus. The bad news: I need a new printrboard. The irrelevant news: I think I’ve discovered a  failure mode for printrbot’s extruder board that … Continue reading

Posted in things that don't work | Tagged , | Leave a comment

Beware the clearance tech, my son

For it will drag you down a rathole. When I saw that tricolor LED strip marked down to seven bucks at the local Radio Shack this winter, I thought, “what the heck, might as well pick it up.” Less that … Continue reading

Posted in things that don't work | Tagged , | 2 Comments

And this is why you make really sure which USB port you’re writing to

(Update: Mostly fixed. If reflashing a Printrboard from the bootloader on up interests you, see the next post.) I was getting ready to print a nice big dragon on my Printrbot, but I knew it was going to take several … Continue reading

Posted in things that don't work | Tagged , , , | 5 Comments

It’s all in the background.

When I was in college, I worked in a laser lab one summer, for a visiting professor who was doing research on metal-vapor lasers. The first half-dozen times we turned his apparatus on, all it did was make the grad … Continue reading

Posted in things that don't work | Tagged , , | Leave a comment

My office is too small for a mobile robot

Why four-wheel drive is a bad idea for ostensibly simple bots Continue reading

Posted in things that don't work, toys | Tagged , , | 2 Comments

First rule of holes

I wanted to get something printed before this afternoon’s maker meeting, So when Repetier crashed (it does that on and off) I figured it would be no problem to just restart, reconnect and get the print going. Nerp. Apparently it … Continue reading

Posted in probably boring, things that don't work | Tagged | Leave a comment