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RepRapper
RepRapper

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Fretting corrosion
Long ago I noticed friction fit connectors are not reliable in 3D printers:  hydraraptor.blogspot.co.uk/2011/06/reliable-connections . For example, 0.1" Molex connectors that are rated for 3A burn out when only carrying 1A motor currents. Even signal connec...
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Will it burn
I always intended to put lots of different tool heads on HydraRaptor
but after being a milling machine for a while it got stuck as a 3D
printer until I started making Mendel90 kits and then it sat gathering
dust. Back in 2009 I bought a 1W 808nm infra re...
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Adding weight
Sometimes it is desirable to make 3D printed items with heavy bases, so that they stand up or are not easily moved. An example is this base I made to hold two tiny PCBs. They are Hall effect isolated current to voltage converters that I plan to use to meas...
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Mooshimeter Mod
Last year I bought a Mooshimeter wireless 2-channel multimeter. It is a multimeter front end that links to your mobile phone with Bluetooth and displays the results in an app. It is handy because you can read it remotely, it can measure voltage and current ...
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Beware fake wire!
I bought some test leads with banana plugs and alligator clips for £0.99 on Ebay from Hong Kong. They were described as "Alligator Probe Test Leads Clip Pin to Banana Plug Cable for Digital Multimeter GF". I don't know what the GF means. Very cheap and what...
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Beware of cheap Kelvin clip LCR meter test leads
When I first got my Elektor LCR meter I didn't have any four wire test leads for it so I made up a pair from the ends of an old VGA monitor cable and some miniature crocodile clips. These worked well enough for measuring normal components but they are not t...
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Elektor 500ppm LCR meter case tips
I recently bought a 500ppm LCR meter from Elektor because I didn't have anything for measuring inductors or the ESR (equivalent series resistance) of capacitors, both of which are important for modern electronics, particularly switch mode regulators that ha...
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Cool maps
The aim of making the instrument described in the last post was to be able to quantify the cooling effectiveness of various fan and duct combinations by sampling the airflow at a grid of positions around the nozzle. I attached the denuded bulb to the termin...
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Added CraftWare to the list of slicers that can't slice my fan duct. Any others I should try?

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Quantifying cooling
A few months ago Neil Darlow mentioned that he had replaced his Mendel90 fan with a quiet version and it seemed to give better cooling results. This made me curious because quieter fans of the same dimensions generally spin slower and produce less airflow. ...
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