Electrokinetic Acceleration with Pancake Coils

Recently at the Dallas Makerspace I had a bit of a crowd when retesting and calibrating my high voltage pulse system. We went through a few different applications, and the most entertaining is always the Pancake Coil Gun.

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24hr Review: Kodama Trinus 3D Printer

24 hour review of the Kodama Trinus 3d Printer:
In short: I love it as a rock solid, stable, and precise unit.
tl;dr pro/cons


– very fast for a lead screw
– high level of precision
– most robust printer I have put my hands on (and that I can find) suitable for home use
– support for non-official slicers (like Repetier), along with the official Pango
– Support for customer extruders via generic stepper driver & control FET. This might as well be a generic CNC kit that happens to come with a print head. I see this having a large customization community once more are shipped
– Easy enough to use that I could recommend it as a starter unit for those who have never used one and can’t take a large learning curve
– preprogrammed SD cards are useful if you have repeat parts that need printing, but unless you have the LCD screen or another controller it will only be practical with one print set per card since you cannot select the file to print.

– custom print head rather than tried and true RepRap model. This means that if they go under, parts may be hard to come by for things like worn nozzles. However, with the ease of integrating other extruders this may not be as much of a long term issue as some are working to port other print heads (even dual extrusion, though last I checked they had not finished this)
– smaller print area
– bed material choice of Acrylic for the default, rather than a heated bed support by default
– heated bed really was an afterthought (see notes below about motherboard comms)

Longer Description:
It may not be the fastest printer in the west, but it is running lead screws at 70mm/s with accuracy, and I am running 100+mm/s for simpler prints without any real issues.
The biggest gripe: the bed heater is not tied with the motherboard (I didn’t even get the heated bed option anyway for the time being. Since it is not tied into the primary controller might as well make one). Whilst the printer waits for the
nozzle temp to be appropriate, it has no way of knowing the bed temperature before it starts the print. It also cannot shut off the bed after the print is done.
Biggest plus: the thing is rock solid; it is all steel and aluminium with no belts or gears. It doesn’t need bed levelling (smaller print size, with incredible design tolerances). I could travel with this thing and not have to recalibrate anything.
It is not too loud, but not the quiestest printer either. Overall it does not seem to have changed too terribly since the pre-production reviews from during the kickstarter. However, they did take in some backer feedback such as identifying the different Z-Axis leads in the documentation better. It also works fine with or without Pango, and since I may make a build server using a rPi will likely switch to Repetier in the long term.
I have printed 4 items with success, and two had issues. One of the two I tried to print without supports and that was a bad idea with a long bridge (and thus operator error). The second detached from the bed at a faster print speed and stuck to the head. I reprinted that one just fine by lining the bed with painters tape (planning to make a better bed wither by A) better material than the stock acrylic, or B ) just putting said tape down before prints). Regardless I feel I would not have had the detachment with a better bed surface.

I am currently procuring various types of filaments to play with in this unit, and so far have been mostly using standard PLA. I am also waiting on an order of more nozzles before I start doping metal printing since they may cause faster wearing.

Some sample prints:

batman spinner. Printed using Inland PLA @ 100mm/s, 210C, and .15mm layer resolution. For a simpler design such as this perfect for faster speeds.
37mm grenade holster. I needed a belt holder for grenades for my under-barrel launcher. Printed using Polymaker PLA (included with the Trinus, and sold through them at a discount to original backers). Run at 70mm/s @ 205C and .15mm resolution. It printed a belt look without any issues

What is really neat is that I didn’t even bother to calibrate this printer. It does not even have a bed levelling function since it is so robust, and the print area small enough that the bed itself would not introduce much in terms of error.



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Homemade Photo Emulsion

(from the Project Archives)

Back when I was in high school, I did a lot of darkroom photography. At one point, I decided to make my own photographic emulsion. I wanted to coat canvas with it and expose my prints to it. With a little bit of chemical preparation, it ended up being a very simple procedure.

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Peach EXE Template

I uploaded the first of my old Peach fuzzer templates to my Github account. This template is for the Microsoft PE/COFF 32bit EXE executable standard. I originally made this at my super-secret-alter-ego job almost 4 years ago. However, we did not have the resources to devote to running it at the time. Should not be too hard to update for 64bit and other newer attributes. May run it on some windows 10 VMs, or through some AVs such as Symantec.

Github Peach Fuzzer Templates

Mobile Ham Radio Microphone Hack

(from the project archive)

I wanted to install the option of an alternate Microphone for a Yaesu mobile radio which uses a modular (RJ11) type hand mic, whilst keeping the original microphone DTMF Functions.

I made this modification because I want to use the Headset from my Hand Held Transceiver, a Pryme SPM-1500 Throat Microphone, with my mobile unit for a hands free operation. This would also block out noice form my car stereo, or noise from other influences like a rolled down window.

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Hard Drive Window

(from the project archives)

This project was a simple Hard Drive Window. Originally was going to be used for another project involving lasers, mirrors, and the moving platter/drive head. However, I could never find enough drives with similar head mechanics for that project to see the light of day.

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Capacitor Pulse Bank (v2)

(another project from the archive)

I built a capacitor pulse bank a while back. It was installed into a large suitcase, and was using Electrolytic capacitors (so no super-fast rise times, but a fairly decent amount of energy density for the cost).

Caps: 6x caps rated 5600uF @ 500V ==> E =(1/2)*C*(V^2) = 4.2 kiloJoules of energy.

The Pulse Bank was designed to fit into a Pelican 1600 case for durability and ease of transit.  The case included a wired remote control, the capacitors, and a triggered spark gap. It was fairly simplistic in design, but useful for a time. While most of my project videos and files were lost in a set of failures long ago (who would have expected an entire RAID 6 and backup system to go within the same week), these photos are here at least as what was recoverable.

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Jacobs Ladder

This project is a favorite of mine, and the one shown here was built for the “laboratory of the Scientists from Krypton that saved Superman from the exploding planet room thingy” of a past event.

The Jacob’s Ladder is a pair of vertical (or in extreme cases, horizontal) electrodes that are parallel to each other and connected to a source of High Voltage. The air between the bottom of the electrodes has a Dielectric Breakdown due to the high voltage potential and creates an Electrical Arc.

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Nixie Millivolt Meter Clock

(another from the project archives)

I have been interested in the quirky sides of electronics for as long as I can remember, but I don’t know how Nixies evaded my eye for so long. Only during my first semester of college did I come across them. Such an awesome looking display, the 3D look to it and the glow of a tube-like device. Like many before me, I instantly decided that I needed to make a clock.

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Calcium Carbide Cannon

I built a PVC cannon fueled by Acetylene gas back in high school (this is part of my old project archives migrating here). The gas was generated by Calcium Carbide. This cannon originally had electronic ignition but after several fires the igniter decided to “remove” itself from the cannon. This cannon also has an expansion chamber to get a better fuel/air ratio for larger amounts of fuel.

This is primarily a SALUTE cannon, not a launcher. While it can launch things, I made it to make a very loud noise for things like 4th of July or special occasions.

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