Next Weekend: The Midwest Reprap Festival

midwest

Guess what next weekend is? It’s the Midwest Reprap Festival, in Goshen, Indiana. We’ll also be there keeping tabs on an absurd amount of new RepRaps and other 3D printers, new filaments, and distributing a ludicrous amount of Hackaday swag.

The highlights of the fest include the folks from Lulzbot and UltiMachine, [Prusa] showing off his i3, [Nick Seward] and the WallySimpson, and Lisa RepRaps, and hundreds of other RepRappers showing off their latest projects and printers.

Here’s the best part: it’s all free! It would be cool if you register before making the trip out, but any way you look at it, it’ll be an awesome weekend. It’s also the largest US gathering of 3D printer aficionados that isn’t on the east or west coast.

Solving Endstop Woes with a Simple Analog Filter

NoiseEndstop

You know what’s cool? Using your engineering knowledge to solve problems that you have while building something. This is exactly what [Reinis] did when his 3D printer’s endstop wasn’t working.

Many of us automatically go to a microcontroller when we run into a problem with a sensor, but often a simple analog filter will do the trick. The endstop in [Reinis’s] RepRap style 3D printer was giving off an unusual amount of noise when closed. When he hooked the endstop up to his oscilloscope, he was shocked to see how much noise there really was. In comes the low-pass filter. Unhappy with the response time of his low-pass filter, [Reinis] solved the problem using a pullup resistor. Two resistors and a capacitor was all that he needed to fix the problem. A great solution!

How have you used analog filters in your projects? Send us a tip and let us know!

The Stepper Driver Driver

KONICA MINOLTA DIGITAL CAMERA

The Stepstick and Pololu motor drivers are the heart of just about every Reprap electronics board, but they can go bad. The usual way of testing these things is to rig up a microcontroller on a breadboard, grab some cables, and wire something up. [Ken]’s Easy Stepper Motor Controller is a much simpler solution to the problem of testing these drivers and could, with a bit of practice, be constructed on a single-sided homebrew PCB.

The Easy Stepper Motor Controller is a very simple board with connections to a motor, a power supply, and headers for a single Pololu or Stepstick motor driver. Two buttons and a pot control the rotation of the motor with the help of an ATtiny10, and jumpers for up to 16x microstepping are right there on the board.

There’s a video after the break showing what this stepper motor driver driver can do. It’s not much, but if you’re just testing a driver, it’s all you need.
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We’re Going To The Midwest RepRap Fest

One month from now, Goshen, Indiana – deep in the land of Dairy Queens – will become one of the premier sites for RepRapping, 3D printing and everything involving open source manufacturing. It’s the 2nd annual Midwest RepRap Festival to be held March 14-16. Oh, Hackaday will also be there, cavorting around, distributing some swag, and doing some live videos and posts of the event.

Highlights of the Festival include [Prusa] giving a talk on the state of open source printing, [Sonny Monicou] discussing the challenges of his RepRap workshops, a roundtable discussion of the RepRap project, [Nicholas Seward] and his creations – the Wally, Simpson, and Lisa, along with a few folks from Lulzbot and UltiMachine. Basically, the only way to go to a bigger RepRap convention would be to visit a Maker Faire, and even that would only add a few hundred 9-year-olds astounded by printed Minecraft figurines.

If you’re willing to make the drive, there’s no fee to attend; just register, show up, and you’ll get a table for all that up-til-midnight RepRapping. There’s also a waffle breakfast on Sunday, along with me walking around makin’ it rain Hackaday stickers.

A Quick and Simple Filament Joiner for Multi-Color Prints

Filament splicer

[Malcolm] was having a grand time with his new 3D printer. He was getting tired of monochromatic prints, though. Not having a machine with multiple extruders, he went looking for a way to join pieces of filament. There were a few designs on Thingiverse, but they required milled parts that he didn’t have the tools to recreate. Rather than invest in a mill, [Malcolm] decided to build his own filament joiner. He started by raiding his wife’s hair care tools. His first test was a curling iron. It had the heat, but lacked a good surface to join the filament. [Malcolm’s] next test was a ceramic hair straightener, which he found to be the perfect tool.

The splicing process is simple. Start with a hot iron, then lay two pieces of filament on top of the short end of the iron. They soften quickly and melt together. [Malcolm’s] real trick is to slightly pull the joint once the two pieces have joined. Pulling causes the filament to stretch, slightly reducing the diameter of the joint. A thinner joint helps prevent extruder jams as the joint passes through. This method works great for PLA. We’d love to see if it works for ABS as well.

Click past the break for an example piece and for [Malcom’s] instructional video.

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RepRap Simpson puts a new spin on delta RepRaps

Just when you think you’ve seen it all in the 3D printer world, something new pops up! [Nicholas Seward] posted a video of RepRap Simpson, his latest project.  Simpson is a delta robot – but unlike any delta we’ve seen before. Previous offerings vertical rails on which the arms travel. As you can see, this design mounts three articulated arms directly to the base of the printer, using steel cables as part of the joint mechanism.

Judging by [Nicholas’] posts on the RepRap forums, Simpson’s grounded delta design has already gone through a few revisions. The basic geometry though, has remained the same. [Nicholas] calls this edition a “Proportional Gear Drive Joint Simpson”. The name may not roll off the tongue, but the movements are incredibly smooth, organic, and fast.

As with any delta design inverse kinematics play a huge role in the software. [Nicholas] is trying to simplify this with an optical calibration system. For the adventurous, the equations are posted on the forums, and a python Gcode preprocessor is posted on Thingiverse.

Even Simpson’s base received special attention.  It’s built from a water jet cut piece of basalt.  We like the use of opposed helical gears on the large joints, as well as the guitar machine heads used to tension the cable drive. One thing we are not sure of is the longevity of system – will cable stretch play an issue? Will the printed parts suffer wear from the cables? Only time will tell.

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3D Printering: Electronics Boards

If you’re gearing up to build a 3D printer, one of the first things you’ll need to look at is your options for electronics boards. Whether you decide to optimize for cost or capability, the choices you make during the planning stages of your build will drastically affect what the final project will look like and how it will behave.

There are a ton of electronics boards out there, so for this installation of 3D Printering, we’re going to take a look at what’s available. Hit the link below to give Hackaday more pageviews read the rest.

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