Tag Archives: Zach

Making passion

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ManDrake responded to my last post about MakerBot being a victim of their own success:

Do you think the expectations difference could be at all connected to Bre’s constant overselling of the product to anyone that will listen? He’s completely disconnected from reality in the way he talks about the Makerbot and what it can do. He’s got the look and feel of the sham dot com boom types, overselling in hopes of getting some bigger company to buy them up, so they could unload their utter mismanaged and badly organized start up. In probably under an year they’ll sell out and then a corporate entity will realize their mistake and kill the product like they did as the boom died.

Here’s my response:

  1. I’m biased.  I think MakerBot have a great product that really delivers.  Thus, I don’t think Bre or MakerBot are overselling anything.
  2. There’s no way to really address ManDrake’s concern about how he feels about MakerBot’s public persona.
  3. Having never seen their books, I can’t say whether they’re mismanaged – but I doubt it.  They’ve grown a lot in a year and hopefully will continue to grow.
  4. I sincerely doubt their plan is to hype themselves, get acquired, and cash out.  There are just so many easier ways to make money.
  5. Even supposing they’re acquired and the new company kills the MakerBot, I’m not left in the cold.  Building my MakerBot has taught me how to build MakerBots.  I can go out and build another one or repair my own.  There are plenty of people selling plastic.  From the day my MakerBot started working I was never going to be without my very own 3D printer ever again.

This may sound unrelated, but bear with me.  Tonight I had the good fortune to hear Dr. Zahi Hawass speak in San Francisco.  If you’ve ever seen an exhibit, TV show or documentary about Egypt, the pyramids, mummies, or King Tut you’ve seen him and heard his enthusiasm.  He gave a piece of advice at the end of his talk:

“If you like something, it is not enough.  If you love something, it is not enough.  Only if you are passionate about it will you make it big.”

When I see Bre and Zach and Adam talk I see people who are truly passionate about their goals.  This is the kind of passion scammers imitate and others wish they had.  Their passion is infused in their products and absolutely infectious.

Rebuilding my extruder

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Over the weekend I rebuilt my extruder after some adventures with a blowtorch.

I used Rick’s single nichrome wrap method, which served me well on my last re-build.  The documentation of his method is absolutely fantastic and a must-read if you’re rebuilding your heater.  (That page is about PLA, but the nichrome wrapping is pretty universal).

I’m not sure if I wrapped my thermistor better or what, but I seem to be getting more consistent readings from it.  Perhaps this is due to RepG v12?  I would tend to think not since I’m using RepG v12 with the Zach 1 temperature table – the same table I was using before RepG v12.

MakerBot, Mendel, Mendel-Mini Build Areas

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Owning a MakerBot, I’m not even sure why someone would need something to print pieces much larger than the MakerBot build area.  Printing something as large as just the maximum build volume of a MakerBot would take ages.

While the official longest print logged on the Makerbot website is Zach’s Disney head, clocking in at 2 hours and 45 minutes, I’ve read about people printing for up to 8 continuous hours.  If the build volume for a Mendel is 4.3 times that of a Makerbot, it would take more than 34 hours to fill that build area.

When you’re printing a door hook in 15 minutes, it doesn’t pay to drive to the hardware store.  When it takes 34 hours to print a big plastic brick, you’re better off driving to the gas station, filling up your tank, driving to McDonald’s, filling out an application, working an hour, quitting and demanding your paycheck, driving to the hardware store, buying a single brick, and then driving back home.  I figure that kind of silliness would only take half a day or so.  Heck, with 34 hours, you could do this at least six times over.

How to caliberate and tune Skeinforge for your MakerBot

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Update 4/21/2011: This post is more than a year old.  Since then I’ve created ProfileMaker which should eliminate the need for almost all of these steps.  Share and enjoy!

A MakerBot Operators group member, Cliff Biffle, has posted a very comprehensive list his Skeinforge tuning and calibration procedure.  Cliff owns MakerBot #69 from Batch#4, named Kallisti.  Although Cliff has a MakerBot Skeinforge tuning page, it looks like he hasn’t had a chance to transcribe his lab notebook yet.  However, Cliff has been patient enough to type up his Skeinforge calibration information twice for the benefit of the MakerBot Operators group.  Here are links to his original postings on 1/6/2010 and another on 1/15/2010.

The other day I wanted to go back and find his calibration procedure, but had forgotten who had posted it, when it was posted, and which thread it was posted.  Having now found it, I don’t want to lose it again.  It turns out that Cliff had posted it once in response to my own question about dialing in Skeinforge settings in order to print up lego pieces!  Thanks Cliff!

I’ve mashed his two posts together to put together this checklist:

  1. Adjust Temperature:  Skeinforge -> Raft
    1. Find a temperature that allows you to extrude quickly and easily without too much popping or smoking
    2. MakerBlock: I have one of the 1mm thermistors, use the Zach 1 temperature table, and print reliably at 220
  2. Adjust Layer Height: Skeinforge -> Carve -> Layer Thickness (mm)
    1. Cliff uses the default of 0.36
  3. Adjust Extrusion Speed: Skeinforge -> Speed -> Flowrate PWM Setting (if PWM Setting is Chosen)
    1. Make the extruder go slower and lower the PWM value
    2. Cliff uses 230
  4. Adjust Feedrate: Skeinforge -> Speed -> Feedrate (mm/s)
    1. Too fast and you lose the fine detail and introduce errors.  Too slow and it will be too… slow.
  5. Adjust Skeinforge to understand how much plastic is being extruded
    1. Raise the Z axis and perform a test extrusion into the air
    2. Do not pull or stretch the extrusion
    3. Using calipers, measure its diameter, D
    4. Go into Skeinforge and look up the configured layer thickness, T, from Skeinforge -> Carve -> Layer Thickness (mm)
    5. Divide the diameter by the thickness, D/T
    6. Set Skeinforge -> Speed -> Extrusion Diameter Over Thickness (ratio) to D/T
    7. Print a test piece with thin walls
    8. Measure the width, W, of a single extrusion somewhere above the first few layers
    9. Divide the width by the thickness, W/T
    10. Set Skeinforge -> Carve -> Extrusion Width Over Thickness (ratio) to W/T
      • Cliff said this setting may be in Fill, but I think he may have meant Carve

    11. Nick Ames has suggested setting Skeinforge -> Carve –> Extrusion Width over Thickness (ratio), Skeinforge -> Inset -> Extrusion Perimeter Width over Thickness (ratio), and Skeinforge -> Speed -> Extrusion Diameter over Thickness (ratio) all to the same value.  His post also has a lot of information and links about other potential Skeinforge tuning resources.
  6. Adjust other Skeinforge settings
    1. Overlap of grid corners
    2. Infill density
    3. Unpause
    4. Stretch