add comments to a gcode file

I’ve just written a new command-line tool (CLI), this time in NodeJS/JavaScript but as usual, it’s open-source. The program will create a new version of your 3D printer’s GCODE file, adding comments along the way which describe what each command does.


I would suggest that it’s best to install it somewhere in your path and then you should be able to just invoke it easily in your working directory where the GCODE file(s) live:


$ gcode-comments file.gcode

;Generated with Cura_SteamEngine 2.3.1
M104 S205            ; Set extruder temperature
M109 S205            ; Set extruder temperature and wait (blocking)
M107                 ; Turn off fan
M205 X10             ; Adjust jerk speed
G1 F2400 E-1         ; Move and/or extrude to the indicated point

Input:  file.gcode
Output: file_commented.gcode

talking at the speed of lightning

I give so-called “lightning talks” at San Diego JS, a four-times-per-month local group on Each talk only lasts five minutes so there’s time for several speakers within the span of a single event.

The venue is typically packed. Here’s a photograph of a typical turnout—there were about 120 attendees this month alone.

I suppose you can communicate a lot in a mere five minutes. It is a bit challenging to try to distill down all the things you need to say into this timeframe. There’s really no room for story-telling, just tell the straight facts and details as you race through your slides and screenshots and nothing more. At best, you can hope that someone will ask a relevant question which may allow you to go into some detail you’d earlier hoped to have included.


Many of my projects involve more than one computer. Unfortunately, the security settings on most wi-fi routers at venues like this don’t want you to connect from one computer to the next. The router would actively prevent your demo from working. So I’ve learned to bring along my own networking, which is a hassle. This is especially difficult with IoT projects, for what it’s worth.

Another challenge is related to power. It seems like each of the speakers needs to setup prior to the event and so they all want to bring along their power adapters and plug in. This means that the venue would need to accommodate all those brick-style adapters and they usually forget this.

And I suppose, a recurring problem is that of screen resolution compromises that you have to put up with. You will have formatted all your screens for one resolution while creating your content, only to find that you’re now presenting in a smaller resolution. This then threatens to clip off content or the font size is now too small to be seen by those near the back.

Regardless, it’s a rewarding experience and I hope to give more talks in the months to come. I would encourage others to do the same. It’s a great opportunity to give back to the community of like-minded coders.

mobile app for the robo

I’ve written a new mobile app for the Robo C2 and Robo R2 set of printers by Robo 3D, a local San Diego—based company.



It’s written in the Adobe PhoneGap (Cordova) platform with Framework7 for the styling and scaffolding. It communicates to the underlying OctoPrint interface inside the printer itself. Rather than building several smartphone apps and being subject to the recurring annual developer fees by Apple/Google/Microsoft, I intend to serve it up in a more economical way: embed another single-board computer inside the printer.


This will fit nicely on a $10 Raspberry Pi Zero W computer, as shown. It’s then powered by the USB 5V supply inside the printer and would be powered on every cycle. I’d then use my iPhone’s or iPad’s browser to simply connect to the app.


The app is fully-functional for the Robo C2 printer and sports a slick-looking interface.



And here are some obligatory screenshots of the app.





get to dah choppa

Today’s post title comes from the Schwarzenegger movie Predator but the dialog has taken on a life of its own in the world of memes.


GetToDahChoppa CLI tool

I’ve just completed another program written in the Go language compiler which will take an existing GCODE file for 3D printing and chop it into as many layers as you’d like.


Color by layer

You might be wondering why you’d like to do such a thing. One of the best reasons I could think of would be to print different colors on the same part. In this part example displayed, black filament is used from layers one through seventeen and white is used from layers eighteen and up. The result looks quite professional even if this is using the lowest quality setting on my printer and it took less than twenty minutes to finish.


Saving an aborted print

Sometimes things go wrong. In the example below, my (costly) carbon fiber—infused filament spool ran out during the print job, noting that the printer arrived with a faulty run-out switch. For most people, they would just start over on such a part, wasting the plastic and the hours spent and begin again.


Fortunately, you can now chop your original GCODE file to just print the missing top to save the day (and the part, of course).


keeping busy

Sorry for what must seem like a brief interruption in posts but I’ve been busy lately. Perhaps three weeks ago I left my job at the pharmaceutical company and I’ve now picked up an evening gig two nights per week at a software coding academy in downtown San Diego, having started on Monday of last week there.


Of course, I’m continuing to print parts on the 3D printer. I just designed a pencil holder and a coin with the academy’s initials as part of the logo and have printed each as samples.


I’ve recently created some programs and plugins in the 3D printer space.


I created a short fifteen-minute presentation for ES6 Let & Const and presented that on Tuesday evening and I just finished a tutorial on 3D printing for them as well. I’m now an instructor so I’ve been reading through their curriculum to get myself up-to-speed as quickly as possible.


I’m currently working on a pass-through for the Robo C2’s now unused filament holder hole through the back of the printer since the dual-spool upgrade has been so successful.

In conjunction with this is the second-extruder upgrade project as well as another to allow my Nikon D3200 camera’s remote shutter release option to be fired off by the printer itself. As part of this, I’ll be moving the speaker to the outside of the printer so that it can be heard better.

I’m continuing on the final implementation for the dual-filament run-out detection block which wants me to do some soldering.


I’ve had some recent successes making tasty meals. One advantage to working less hours is that you now have the time to make great food instead of relying upon packaged dinners. I’ve made some convincing Indian meals from scratch and without a recipe which is new for me. And when I say “successes” earlier, I guess I mean to say that I’ve created what is to me some of the best food I’ve ever eaten (soup, chowder, chili, spaghetti sauce). I now have perfected mango lassi, another Indian favorite, and the basic smoothie recipe. I’ve learned to buy chicken in bulk and then to cook it in a variety of ways which keep it tender and moist while still ensuring that it’s thoroughly-cooked. I routinely pan-flip what I’m cooking like a pro.

Did I mention that I own a toque blanche and a chef’s uniform? I was fortunate enough to take some seminars at the California Culinary Academy. I would say that sauces and breads would be my specialties… or perhaps apple pie.

I’m now batch-making tea and iced mocha for several day’s consumption because I’m like that. I would be baking things to the extreme but San Diego’s weather has been so hot lately that I avoid the oven now when I can. Perhaps next week will cool down a little for that.

go figure

For years, if I needed to write a computer program, I’d have used one of the following: C, C++ or C#. Those have been the mainstays of programmers who needed an executable program for at least the two decades. Today, though, I’ve just written my first executable in a new language that’s surprisingly easy to work with.


The Go language is like the new kid on the block of compilers. Like the ones mentioned before, it will take text and convert it into instructions the computer can do.

Probably the best thing about the Go language is that it’s entirely open-sourced. If you wanted to work on the compiler itself, you could do so.


The program I’ve just written is technically called a Command Line Interface (CLI) program and will display technical details inside the selected GCODE file for a 3D print job.


Typical session of the program in use:

$ SlicingInfo RC_3DBenchy.gcode
Slicer:          Cura_SteamEngine 2.3.1
Layers:          239
Quality:         low
Profile:         Low Quality Robo C2
Filament size:   1.75
Hotend temp:     190
Bed temp:        0
Supports:        False
Retraction:      True
Jerk:            True
Speed 1st layer: 10
Print speed:     50
Travel speed:    80
Infill pattern:  cubic

traveling at the speed of open-source

pull request:  An external-repository modification to someone else’s code which you’d like them to adopt into the master copy of the original repository, specifically the notification request to ask for this.

It’s funny, I put in a pull request in March of this year for a timezone calculation bug which I’d discovered somewhere out there in someone else’s code.  I guess I was trying to be a good net citizen and giving back to the community.  I’d forgotten completely about it until now.  The original author merged my commit into his code yesterday and blessed it, basically.  This would actually be my very first pull request in the world of open source so I suppose that’s special in some way.

In this particular case, it took the author almost three months to see the request and get around to responding to it.  Granted, few of us would be paid to maintain our open-source repositories so they’re usually just considered hobbies for most of us, something we do in our spare time.

As a coder with many decades of experience, this pacing is a bit odd to me.  (As in, “wow, three months to bless a quick-and-dirty code fix”.)

I’m not complaining…  Okay, maybe I’m complaining.  Maybe I was just a bit naive to the average amount of effort people are putting into this.

The entire collective force of open-source is something to behold.  Almost every day some huge effort is being launched and thousands—even millions—of downloads occur from these repositories.  But what happens to the original codebase when the author gets side-tracked with their next great idea?

But what happens to the original codebase when the author gets side-tracked with their next great idea?

The New, New Thing

All this reminds me of the biographical book “The New, New Thing” about a serial-entrepreneur, Jim Clark (of Netscape fame).  The biography doesn’t really paint a pretty picture of the billionaire, instead suggesting that he was perhaps suffering from Attention Deficit Hyperactivity Disorder (ADD) or possibly Hypomania.  He couldn’t focus on a project after the second year, opting to push the work onto others and move to the next project.

I guess I have to ask what part this plays in the world of open-source software.  As an inventive person, I stare at my To-Do list of project ideas and realize that it could be argued that this is some mark of my own internal restlessness.  Could I be content working on one project for year after year?

I’m a former CEO and at one time I did run a software development firm for nine years.  Fortunately, though, I had project after project then to develop so that kept things lively. I’m impressed by those who literally spent most of their lifetime devoted to a single project.

A Lifetime of Service

Dr. Royal Rife comes to mind as one of these people.  He was curing cancer and a variety of diseases back in the 1930 decade but he spent much of his life before this inventing the microscopes and medical device equipment which he would use in the culmination of his life’s achievement.  His original home site is now the location of one of the Scripps hospitals here in San Diego but seemingly nobody knows his story.  He spent a lifetime curing cancer and he isn’t famous for it.

I guess we as a society aren’t really conditioned to reward and remember someone who did one thing very well.  To be famous or respected now, presumably you have to produce project after project, never satisfied with the maintenance of same, always chasing the next big thing.

If You Build It, Own It

I guess my word of caution in the world of open-source then is to own what you’ve built.  Try to revisit it from time to time, like you might keep a plant alive by watering it once in a while.  Do new things, of course.  But don’t forget that your last thing could actually be ticket to your success.

the 21st century digital résumé

It used to be that a programmer’s résumé was a single sheet of onionskin paper (expensive, semi-transparent) with a carefully-selected collection of one’s job history and such. Parts of what you were trying to “sell” to the would-be employer were your wordprocessing and layout design skills.

Now, everyone can type, has access to printers/computers and Microsoft Word. In fact, they can even select an attractive template from the many offered so it’s not like much skill is now involved in those areas. At one time, spellchecking was an activity that involved a Webster’s dictionary. The world has changed.


To be an open-source programmer, you must now have a public set of repositories on or so it seems.  My collection of repositories on github.


As of today, I now have my very own collection. My public dashboard on jsfiddle.

WordPress blog

More and more, programmers are encouraged to be social and outgoing enough to want to communicate to others. Obviously, you’re here already so you have my blog’s address.


And part of that “being social” requirement now seemingly includes spending a fair amount of time during your life chatting with others within the coding space. Since projects appear to be project-centric rather than coder-centric, there doesn’t appear to be a way of publicizing your identity outside of a particular team URL.

Website portfolio

And then of course, potential employers want you to highlight several existing website concepts in which you either participated or you directly own them.

why do you contribute to other’s repositories?

I’m interested to hear from other open-source coders out there. I’d like to know some of your motivations for contributing to another person’s or another team’s open-source repository. Call it a social studies experiment, if you will.

1st-Person Open-source

Here, I’m attempting to answer the question for everyone: “Why do you work on your own project in a public way and sharing your source code, knowing full-well that someone may take your code or fork your project and become rich and famous as a result?”

  1. I believe that my project has some worth for others and sharing it could make the world a better place to live in
  2. Other people might help me with my project
  3. A well-rounded github set of repositories looks good on my résumé
  4. I’m not expecting to make money from doing this
  5. Since I don’t live in America, there aren’t as many opportunities so this is my way of getting some attention from potential companies there

Let me know if I’ve missed any motivations here.

2nd/3rd-Person Open-source

This one’s a little trickier for me since I’ve been a life-time coder. In the not-so-distant past I was well-paid for working on software projects and have watched the coding salaries and the availability of programming gigs all erode.

The next question then for everyone: “Why do you work on someone else’s project in a public way, fixing their bugs and adding features, knowing full-well that some else may become rich and famous as a result?”

Case study – Github: Bloomberg reports that they recently brought in another $100M in venture capital based upon the Enterprise-level private repository revenue they’re currently earning. They’re currently valued at US$2B.

  1. I really like the other project’s code (let’s say, the Atom editor), believe in it and want it to be more awesome than it already is; since I use it myself, I’m getting something from the collaboration
  2. I want to work on a big project but I can’t otherwise get a job in a software development company so this is the next best thing; I’m getting the experience working in a software development team
  3. “Many hands make light work”; it feels good to help others; karma; “what comes around, goes around”…
  4. As a new programmer, I don’t have enough experience to start my own project yet
  5. Since I don’t live in America, there aren’t as many opportunities so this is my way of getting some attention from potential companies there; I might get hired by doing this

If I’ve missed any of your own motivations for coding on other people’s/team’s open-source projects, please add a comment here.

Some Thoughts on the Open-source Subject

What’s strange is when you have an entire team of people spread all over the planet, they’re working together on a project started by one guy (let’s say), time goes by, the project goes viral and then suddenly one day that “one guy” gets $250M in venture capital (like in the case of github). It’s valued at US$2B at the moment, btw. That’s about the same value as the New York Times.

I wonder if the investment companies realize that for the average open-source “company” this means that 1) they’re not necessarily incorporated, 2) they probably don’t have an office nor even a business checking account, 3) and anyone can fork the collection of code and start their own Atom-knockoff project if they wanted to.

And what happens to all the people whose free labor went into making github who they are today? Do they get a share of the money? No, they don’t. Do they get a job? Possibly, I suppose it all depends upon that original guy. But at this point, the power has greatly shifted from what it was before (more of a democratic society) to what it is now (more of a capitalistic corporation).

The siren call of open-source is a world which is free from capitalism. But what seems to happen is that these big projects are becoming exactly that, the thing these coders hated in the first place (or so it would seem). Open-source is supposed to be a culture. So why is it turning into nothing more than a first step to becoming a (funded) software development corporation in the end?

how cool is electron?

I’ve been working the past couple of days with Electron, a Node.js cross-platform desktop app tool which uses JavaScript, HTML and CSS to create what look like native OS-style applications for Windows, OS X and Linux.


Cool stuff, indeed. Out-of-the-box, it looks like you publish your Electron-based app like you would anything on github:

git clone
cd Repository
npm install
npm start

But there’s also a way of downloading OS-specific images and then adding your own app into this subdirectory structure. The result is a stand-alone EXE and folderset which reasonably looks like a drop-in replacement for something you normally would build locally using Microsoft Visual Studio perhaps. In this version though, you’d run Electron.exe but there are instructions on their website for renaming your application, updating the icon’s, etc.

I’ve just used it today to build a basic music player. I wouldn’t say that the layout is as responsive as a typical mobile app’s ability to move content but I did tweak things so that it can squash down to a mini-player and it stills looks great.


I can thank KeithIG/museeks for the open-source code behind this. They have several OS-specific downloads available if you don’t want to build this yourself.


  • This allows you to build cross-platform desktop apps in much the same way that you’d use Adobe PhoneGap, say, to build for mobile apps.
  • You code in the familiar HTML/JavaScript/CSS trilogy of disciplines and it’s Node.js centric. It is also React.js-friendly, as I’m finding on this project.
  • So far, it seems to be well-behaved.
  • If you don’t want others to easily see your code, there’s a step where you can use asar to zip-up everything into a tidy package.
  • I didn’t have to digitally-sign anything like you might have to for a Windows 10 application or for OS X, say.
  • For people who have git and npm, the install is as easy as anything you’ve seen in the open-source space and a familiar workflow.


  • Currently, I don’t see any support for mobile platforms.
  • The complete foldedset comes in a 216MB which strikes me as a little big for what it’s doing.  The app itself for the music player weighs in at 84MB of this so the remainder is everything that Electron is doing to present all this.
  • You would need to setup three different build sites to maintain a specific download for your own app.  (It’s not like PhoneGap in which you just submit the common code and Adobe builds it in the cloud.)
  • Given that you’re not digitally-signing your code, you might have to talk your users through the hurdles of having the user “trust” the content within their particular OS.
  • This might be so popular soon that none of us can really afford to just use Electron.exe by default to serve up our app; we’ll need to rename it before publishing, in other words.


I can see myself wanting to really learn this one deeply. It has a lot of potential for delivering a more native-app experience for users.