Kickstarting a $100 open-source hardware 3D printer

The PeachyPrinter is a well-funded Kickstarter project that aims to produce a $100 kit-based 3D printer that outputs photo-cured resin. The kits are meant to be assembled in an hour, and fully assembled units start at $400. The plans are all open-source hardware licensed and the project includes a great ethical statement about safety, privacy, and freedom. The team looks like it has some good domain-experience, though, of course, as with all crowdfunded projects, you need to be prepared for the possibility that you'll get nothing for your money.

The peachy printer is a Photolithographic printer. That means it uses a controlled beam of light to cure light sensitive resin into hard objects. The peachy moves a laser beam along the X and Y axes to create the shape of the object, while using a drip system to control the level of the resin on the Z axis which determines the height of the object.

The object you want to print must first become a 3D model in Blender. The software we wrote as an add on to blender takes the data from that 3D model and translates it into an audio waveform. It then plays the audio file out to the printer through the headphone jack in your computer. This waveform drives a pair of electro magnetic mirrors. The higher the volume, the higher the voltage, the more the mirrors move. The purpose of these mirrors is to reflect and control the path of the laser beam. By using the audio waveform generated from the 3D model data to drive the mirrors, we are able to get the laser beam to draw out the shape of the object. That's takes care of the X and Y axes.

Now let's talk about the drip system that creates movement on the Z axis. The salt water in the top container syphons down to a drip feed. The rate of this drip feed is controlled by a valve. As each drip leaves the feed, it passes through two contact points creating an electrical connection that is detected by your computers microphone jack. The drip continues to fall into the bottom container where it causes the resin floating atop it to rise. The software listens to the microphone level, counting each drip that falls and calculates the resultant level of the resin. This allows the software to send the layer that corresponds with the current Z-level of the resin. This process continues until the print is complete!

Peachy Printer - Home (Thanks, Terencedesu!)

Notable Replies

  1. Is it just me, or are they trying to fix a problem NO ONE has ever had? What the hell is wrong with USB?

  2. Once upon a time I bought a printrbot, and the dodgy USB serial interface (in windows) is one I'd gladly never touch again. Plus using the sound card is a really convenient way to wiggle mirrors. And just think - you don't even have to check which side of the plug goes up.

    Also - the interface is an afterthought compared to a $100 photo/liquid printer.

    I wonder if you could use the drip sensor as a midi click track and just save objects as really long midi files.

    If I didn't already own a 3d printing doorstop I would totally order one of these. (also I swear one day I'll finish updating and tweaking that thing so that I can fix that coffee grinder)

  3. I expect adding a USB decoder would greatly increase the price and complexity of the system. It looks like everything outside of the computer is completely analog and very simple. There's no digital circuitry at all there. It's pretty genius, in my opinion.

  4. SamSam says:

    I was wondering when you'd post this. I backed it a few days ago. One thing I find interesting is the difference in mindset of the makers and the people buying it: the makers feel like they're creating a great hackable project, but the backers, it seem, want a finished product.

    Specifically, the basic $100 kit does not buy you a container for the water/resin. You provide that yourself. The maker's argument is "look! You get to pick anything! Make a project as large or small as you want!" The unhappy buyers on the forums are saying "But we have to find our own jar???"

    I find the difference between hacker mentality and those who want to just buy something like they're on Amazon interesting.

  5. I like the way they're trying to put all of the intelligence of the printer into the software, making the printer itself incredibly simple.

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