Make your own filament with this 3D Printable Pelletizer from MTU

3D Printing Industry

Woern, an undergraduate Mechanical Engineering student have created a 3D Printable Polymer Pelletizer Chopper for cost-effective additive manufacturing. Research 3D Printable Polymer Pelletizer Chopper Aubrey L. Professor Joshua M. Pearce, of the Materials Science and Engineering department at Michigan Technological University (also a regular on these pages) and Aubrey L.

Michigan Tech’s Joshua Pearce launches free open-source 3D printing course

3D Printing Industry

Raymond FreeCAD Joshua Pearce Michigan Technological University MOST Delta MY4777 OpenSCAD pellet chopper recyclebot RepRap The Cathedral and the BazaarOne of the most popular open-source 3D printing courses, taught by Dr. Joshua Pearce at the Michigan Technological University is now available online for free.

Motor Maths


In a previous post I showed the pitfalls of constant off time choppers like the A3977. When the chopper is on energy flows into the inductance of the motor, increasing its magnetic field slightly. chopper microstepping stepper driver

Free 3D Printable of the Week: The Predator

3D Printing Industry

But, before you get to the chopper, check out this awesome animated, downloadable model from DennisH2010.… By Michael Molitch-Hou. The Free 3D Printable of the Week this week was a tough one to choose.

RepRap Phone Host 3d printing app is released into Windows mobile phone ecosystem

DIY 3D Printing

It includes a STL and GCode render as well as our in-house developed "Bananna Chopper" slicing engine. Bananna3d is 3D printing technologies company in Pretoria, South Africa run by Gerhard de Clercq and Pieter Scholz. They successfully developed Windows mobile phone 3d printing application.

How to Fly RC Helicopters

3D Printing Hub

Toy choppers are not as impressive or as capable as hobby-grade models. They do make the craft less agile, but they’re a lot more stable in the air than single-rotor choppers. Go here to see what a typical high-end hobby-grade single rotor chopper offers. #4

Research Done, But No 3D Chop Yet


We did, however, find a scientific paper exploring the concept. Chopper was a prototype tool built experimentally by researchers at Princeton in 2012. Chopper optimizes these criteria and generates a partition either automatically or with user guidance.

Drones vs. Helicopters

3D Printing Hub

Yes, drones have attractions that choppers with two or more props don’t, but the opposite is also true. RC choppers generally have longer flight times , particularly at the higher end. That makes it pretty crash-resistant—for a model chopper.

A Beginner’s Guide to Flying RC Helis – What You Need to Know

3D Printing Hub

All radio-controlled drones, planes, choppers, and blimps can take to the air of course. And RC choppers at the beginner level are child’s play. Even so, a 3CH model chopper is the perfect place to start for those with no previous flying experience.

8 Best RC RTF (Ready to Fly) Helicopters

3D Printing Hub

Ready to fly choppers are not equal. This arrangement makes them far more stable and easier to fly than single-bladed choppers. Single rotor choppers have only one layer of blades and sport a more conventional look. RC pilots love to fly more than anything.

Albert Paley and Jesse James Metal Sculpture Project to be Revealed at FABTECH

Additive Manufacturing

17, 2017 – After being hidden from public view for months, two steel masterpieces created by world renowned sculpture artist Albert Paley and West Coast Choppers founder Jesse James will be revealed at FABTECH 2017 on Nov. CHICAGO, Oct.

Lessons from the A3977


I fancied using one of the Allegro micro-stepping chopper drivers. The current only flows in the sense resistor when the chopper is in the on state though. I bet it is a constant off time chopper and the minimum current is too high.

New Opening Keynote Format Set for FABTECH 2017: TED-Style Talks to Motivate, Inspire Attendees

Additive Manufacturing

Jesse James, Founder of West Coast Choppers. FABx Tech Talks feature messages about transformation, growth and the future of manufacturing. CHICAGO, Sept.

Designer Spotlight: Haydn Bao

Shapeways Blog

Ridiculous as it sounds, the internet is probably the closest thing to downloading “how to fly a chopper” as seen in the matrix. This week we are highlighting Haydn Bao , one of three behind the awesome drone shop, Fusion Imaging.

Best Kohl’s Black Friday Deals

3D Printing Hub

each: The 15-oz Mini Personal Blender, the Mini Electric Chopper, the 15-quart Slow Cooker, the 2-slice Toaster, the 5-cup Coffee Maker, and the Hand Mixer. The Kohl’s Black Friday deals will be available starting 5pm on Thanksgiving until 1pm on Black Friday. However, all these deals are subject to availability so it’s best to do your shopping early. Kohl’s offers excellent deals on electronics and other items that are at par with the deals offered elsewhere.



I don''t think constant off-time choppers are the best idea. When I built my Mendel I used A3977 stepper drivers. Before that I did some maths to show that the component values need to be carefully selected to match the motor in order to achieve 8× microstepping. Makerbot produced a board with four potentiometers and I published settings for motors popular at the time.

A bit of a contraption


I am running them from 36V with a constant current chopper drive. As I was adding the diagonal tie bars my wife said "it''s becoming a bit of a contraption". I am not sure if that is a good thing or a bad thing! My alternative z-axis using four tin can stepper motors works reasonable well.

Mixed decay, mixed blessing


When the chopper switches off it can do it two ways. Having set the correct off time to suit my motor I can now micro step it with equal spaced steps, but only if I disable the mixed decay mode. It can turn on both low side transistors.

Time for a new extruder controller


R22 sets the off time of the chopper and needs to be different values for different motors as described here. The reference voltage for the chopper is generated by a high frequency PWM output on the micro and smoothed to DC by R2 and C4.

Deviant Z axis


I mounted the four motors and wired them up in parallel to a micro-stepping chopper drive and a 36V power supply. The RepRap Darwin Z-axis has four screw thread drives linked by a timing belt and toothed pulleys, driven by a large stepper motor.

Motoring on with the A3977


It is actually a 14V motor, so is not ideally suited to being driven from a 12V chopper drive.

A Titan Of U.S. Manufacturing: Gilroy Titan Creates TV’s First…

Design 2 Part News

He could match the success of Paul Teutul, the TV personality of the cable show Orange County Choppers. “A Titan Of U.S. Manufacturing: Gilroy Titan Creates TV’s First CNC Machine Shop Show” By Richard A. McCormack, Manufacturing & Technology News. There haven’t been any television shows on prime time that concern CNC machining. But there is one now.