cockrum.net

Fiddy Plus - FT2232H JTAG / SPI Breakout Board

The GitHub Repository for the documentation and examples for this board is here.

I have written and tested a set of Python utilities for TrueRNG devices

AVAILABLE on Github (click here)

Tools (Windows and Linux)

• truerng_find.py: Scans COM ports and identifies all connected TrueRNG devices
• truerng_mode.py: Example of how to change modes on TrueRNGpro and TrueRNGproV2 devices
• truerng_read_example.py: Example of how to read from a TrueRNG device
• truerng_test.py: Finds and performs testing on connected TrueRNG devices

Tools (Linux Only)

• truerng_fulltest.py: Reads a large block of data (14GB) and runs ent, rngtest, and dieharder (takes ~9 hours on the TrueRNGpro / TrueRNGproV2)
• run_rngtest: Linux script to run rngtest since it doensn't like to be called directly from Python - this is a "helper" for truerng_fulltest.py and isn't meant to be used directly

My Canned Peach Wine Recipe

Ingredients

• Canned Peaches (#10 can diced or sliced / 106oz): Qty 3
• Sugar Initial: 8lbs
• Sugar Added Later: 8-9lbs
• Yeast Nutrient: 10tsp (about 50mL)
• Yeast Energizer: 5tsb (about 25mL)
• Lavlin K1-V1116 Yeast: Qty 2

Here are the results of moving from a 0.30mm to a 0.25mm layer height and optimizing the settings.

This is the exact same g-code that I printed before and after the motor swap. It's hard to photograph but it's a huge difference. I wish that Prusa had offered the 0.9° Moons motors as an upgrade option when new.

Changed my Prusa MK3S Y-axis from 6mm rods/bearings to MGN12 Linear Rails/Guides

I tried a few different rods and bearings for the Y-axis but they all seem to have some degree of racking. You can check this by holding the left side of your bed solid and trying to move the right side forward/back. Any amount of movement implies that there is some amount of rotational movement on the bed when the y-axis moves.

Upgraded my Prusa MK3S to Moons 0.9° Stepper Motors to Eliminate VFA (Vertical Fine Artifacts)

These are a direct mechanical replacement for the stock Prusa X and Y Stepper motors. The issue that I was seeing was Vertical Fine Artifacts when moving at 20 to 35 mm/s. This appears to be caused by resonances from the motors when operating at certain speeds. You can often hear that at certain speeds the machine vibrates. I believe that is what was causing my issue.

Just got this new Cosori Food Dehydrator to use for drying filament.

I've been doing a lot of 3D printing on my Prusa MK3S and wrote up an article about how I do reliable ABS printing.

I made some RF Magnetic Loop Probes for WCTF Foxhunting / other uses.

The TrueRNGv2/3 and many other random number generators often provide a uniform distribution output. This article shows how to convert this to a Gaussian Distribution

We've gotten a few questions about using the TrueRNG as a random number server so I banged out this quick example.

We get questions about how to use our TrueRNG random number generators so I thought I would write a tutorial on how to get it running with Python on Windows and Linux

I wrote up an article on testing the TrueRNG using ent, rngtools, and dieharder. I talk about the meaning of the results and the statistics that are expected for a good hardware random number generator.