In my quest for the perfect 3D printer settings, I decided to try the lift option which lifts the extruder from the surface during non-extruding moves. I found that my stock Solidoodle 4 had significant backlash in the z-axis. I tried to print out an anti-backlash nut/spring assembly from Thingiverse but it was made for previous version and my Solidoodle 4 didn't have a long enough z-axis threaded rod to keep the nut on it when in the highest position.
After thinking about this for a while, I considered just printing a solid piece that holds a nut but thought that it needed some give to keep it from wearing the rod or becoming sloppy over time. I settled on using a rubber O-ring below the nut to provide springiness.
To reduce the possibility of breakage, I added a post to limit over-travel.
We started producing our WIOT boards and wanted to ship them programmed but without the programming header installed (since some people may want to keep the board low-profile). We tried holding the 2x6 header in place then ended up buying some pogo-pin adapters from Tindie but it isn't comfortable to hold while the board is being programmed.
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I designed this board to be an easy-to-use way to get connect to WiFi from an Arduino-compatible board. This will allow anyone to write Arduino compatible sketches that can easily use 802.11b WiFi using the ESP-8266 (ESP-01) WiFi module.
Although I could have probably done this as a successful Kickstarter campaign, we did the development on our own and ran a first batch of 50 units. If these are popular, we will run a larger batch.