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3D Printing Learnings

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Over the last few months I’ve had some great successes and miserable failures while using my makerbot. Here is a quick synopsis of some of things pointers I’ve picked up.

Use normal sized painter tape – the full sided sheets that makerbot provides lacks good enough adhesive to too keep larger pieces locked to the build plate. I’ve found that the heat tends to bubble the sheet and cause the piece to curl and print unevenly. I’ve gotten the best results using Scotchblue painters tape and applying in thin strips, it seems to allow each piece of tape to expand and contract individually  without raising off the plate.

Longer is better than larger – pieces that take up a large portion of the build plate tend to curl at the edges, this creates errors in the printing that tend to compound as the piece builds. I’ve tried many different approaches to prevent this, but it seems none have worked.  So far the only solution had been to rotate the model so that the long dimension is the vertical dimension.

Double Check your model before you print – this might seem like a no-brainer but on more than one occasion I have started a print, only to realize that I forgot something half  way through.

-tbc

PCB to Rhino

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I’m currently working on a project that involves creating an enclosure for a circuit board. The hole layout has proven to be a little tricky … I tried measuring everything with a caliper, but the holes on the print were off just enough for the mounting screws not to fit. I then came across this set of really useful tools. It contains a python script that will convert you Eagle files into a Rhino model.

Panoramic Timelapse Rig

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This was a quick experiment using a webcam and a raspberry pi to capture time-lapse footage.  We used the GPIO pins and a motor driver to trigger the stepper and capture the frame data from the webcam. The results were ok, but we found that the steps were not sufficient for a smooth video, a simple geared down servo would work much better.

LED Phone Pedistal

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A quick prototype for an LED phone pedestal using a proximity sensor to change the color of the LED when the phone is removed from the pedestal, This was a proof of concept for a much more elaborate installation featuring many phone on custom created clear pedestals.

RGB LED Pedistal

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Here is a really quick prototype for an RGB LED pedestal that we created for a Verizon  presentation. The final product will be CNC cut from lexand (right now we are just using a cup).  The circuit consists of a photoresistor to sense if the phone is on the pedestal, and ATmega328 or Tiny for control and and RGB LED that changes color when you list the phone.

MIT Media Lab

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Spend the week up at MIT Media Lab, marveling at volume and quality of innovation there.  There is truly such a variety of work there. My favorite among the pantheons in the Mediated Matters Group. They are experimenting with all sorts of mediums and forms from Room sized 3d Printers to beez wax sculptures. Perhaps the most impressive is the silk pavillion, a 20′ diameter dome created by training silkworms to spin silk over a sparse infrastructure. Biomechatronics is also quite impressive, Scientists are using motion capture and muscle actuated mechanics to create prosthetic systems that behave very much like real limbs. There are a ton of interesting projects that I can’t mention because they are not out in the public domain yet but here are a few images of the ones I can.

IRA Cheats Sheet

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I know allot of freelancers that get completely hammered by taxes each year. Investing, retirement accounts and such can be really complicated and involved. Here is a quick cheat sheet that gives an overview of the different types of accounts and how to utilize them.

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