OhmEye

Multirotors, 3D Printing, Electronics, and Random Noise
Aug06

OhMini Quadcopter Bill of Materials & Details

by OhmEye on August 6, 2013 at 12:05 pm
Posted In: Multirotor

Here’s the BoM and some details for the components I’m using for the OhMini quadcopters. The big expense is getting all the basic support gear including radios and charger and cables/adapters, but once you have all that you don’t need to buy it again for each multirotor you build. In my case all this stuff is about $160. The quad itself less RX is about $100. I’m using a $18 RX but for this simple quad there are cheaper available, even one for $6. It just has to be compatible with the TX.

Pics of the OhMini Quad and OhMini H-Quad and my nephew’s first time flying a quadcopter. Here’s my fourth flight of the OhMini with an onboard camera. ↓ Read more…

Jul24

Quadcopter Practice

by OhmEye on July 24, 2013 at 11:18 pm
Posted In: Multirotor

I’m learning about quadcopters and practicing flying my own mini-quad design. I’m working on removing vibration from the frame and camera that causes a “Jello” effect in the video, and progressing to flying in First Person View (FPV) and generally having a lot of fun. It’s been over 20 years since I’ve flown any radio control aircraft and things have changed quite a bit!

May11

RepRap Extrusion Flow Calibration

by OhmEye on May 11, 2013 at 9:13 pm
Posted In: 3D Printing

I posted this on a Google group recently and thought I’d repost it on my own blog:

I have been converted to an evil and lazy extrusion calibration anarchist. I no longer believe in measuring filament diameter or how much filament is pulled in, or adjusting the filament settings when slicing. All that painstaking effort is in the hope that if it’s done carefully enough that the calculations will result in the correct extrusion rate without needing any additional tweaking. I was abducted by aliens (or at least an Australian) and brainwashed to avoid all the extra work and skip all the measurement and mathematical masturbation by just watching the extrusion rate during a print and adjusting it until it’s correct. ↓ Read more…

May10

New MendelMax2 Fan Mounts

by OhmEye on May 10, 2013 at 11:26 am
Posted In: 3D Printing

I’ve been running my fans in this orientation for several days and results are much better with more control than any other method I’ve tried. The airflow is much more even than previously and I was able to add insulation to the hotend to prevent it from losing too much heat so that it’s able to maintain temperature. Source files are in http://ohmeye.com/download/mendelmax/

Apr25

3D Printers in the Home

by OhmEye on April 25, 2013 at 5:02 pm
Posted In: 3D Printing

Mirror with broken stand pins.

This is an example of a typical and simple home repair solution when a 3D printer is available. Instead of replacing an inexpensive small mirror or attempting to recover and glue the broken pins that attach the mirror to its stand, I decided to add a thin frame piece to the mirror with new pins. With just 3 measurements and less than 20 minutes of work I had a file ready to print, and the solution seems to work well. I probably spent as much time producing this photo gallery as I did doing the work itself. 🙂 My point in posting this is to show a typical example of just one of many ways I find myself using a 3D printer in applications in our home. It didn’t take long after learning some basic design tools to find myself discovering ways to use 3D printed parts to solve mundane household needs.

Mar20

MendelMax 2.0 Example Prints

by OhmEye on March 20, 2013 at 7:16 am
Posted In: 3D Printing

Thingiverse 34778 Assembled

I’ve started a photo gallery for the objects I print as I continue to test and tune my MendelMax 2.0 3D printer.

Mar18

RepRap MendelMax 2.0 Z Axis Isolation

by OhmEye on March 18, 2013 at 8:31 pm
Posted In: 3D Printing

So although my MendelMax 2 beta2 has only minor Z wobble visible in the prints as long as the leadscrews are not constrained at the bottom by bearings, I wanted to completely eliminate the wobble from appearing at the nozzle. I also prefer constrained leadscrews, I think the bearings help support the weight of the X axis and result in slightly more precise Z movement by taking weight off the flexible motor couplers. I designed a simple part to mount to the leadscrew nuts to support the X axis without being directly connected, so that any XY movement just slides harmlessly against the bottom of the Z arms and they only move in the Z directions. Files are in http://ohmeye.com/download/mendelmax/

Feb27

Prototype Pierogi Press

by OhmEye on February 27, 2013 at 10:56 pm
Posted In: 3D Printing

This is a quick prototype of a pierogi press I designed using Alibre, the first time I’ve done a multipart confined assembly, where the moving parts are printed in-place locked together. The hinge pins are printed inside their holes so the finished result is preassembled and doesn’t need any screws or fasteners. For those not familiar with pierogis, they are sort of a Polish dumpling/ravioli food, a pasta-like dough usually filled with a mashed potato type filling.

Feb25

Disabling/Enabling endstops in Marlin

by OhmEye on February 25, 2013 at 3:49 pm
Posted In: 3D Printing

I often see confusion by people in IRC about how to disable and enable endstops so that accidentally sending a home command (G28) doesn’t cause their printer to crash an axis past it’s physical range. G28 is a command that moves an axis until it triggers an endstop switch placed at the end of the axis. When the switch triggers, the position is set to either MIN or MAX for the axis, depending on which direction homing is set to use. Homing to the MIN endstop is by far the most common method, so G28 moves the axis in the negative direction looking for an endstop and stops when it triggers it and sets the current position to zero. If you don’t have an endstop installed, it will never trigger it and try to go farther than it can, and various bad things can happen, what I call “crashing” the axis. To avoid this, if you do not have hardware endstops for the G28 command to use, you can disable endstops completely in the firmware. ↓ Read more…

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