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Conclusion
01/09/2018 at 13:38 • 0 commentsCombining 3 cells added up to about 12.5V with no load. The voltage drop was quite significant while preheating the extruder and also at the end of the print it dropped to 9.5 V. After printing it came back to 11.2 V but maybe combining 4 cells in series would have been a better solution with a starting 16 V.
This is no science, but just some thoughts on what to do next time because the cells were already half dead, scrapped from an old thinkpad T60 or T400 i think. So it is possible that this could work better with shiny new batteries.
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GIF of the working coin cell printer
01/08/2018 at 21:45 • 0 comments -
final build
01/08/2018 at 21:39 • 0 commentsIt's 30 minutes until the coin cell challenge ends and we managed to bodge everything together. The cell even got painted an hour ago to look more like a "real" coin cell.
The afternoon was used to print some internal parts. After that the case was spraypainted with a silver color since the ordered filament didn't arrive on time.
The pictures show our great work soldering and drilling a hole for the connection to the 3D printer.
There were a few nice ideas left for a more polished version of this, but it was a lot of fun to build. -
3D printed enclosure
01/08/2018 at 14:11 • 0 commentsAt first the goals were set high for our 3D model, but since one month passed faster than we would like to admit, we had to leave some features for version 2; really sticking to the agile programming style: if the updater works, ship it.
Now the 3d printer is done with our biggest PLA parts, so I uploaded a first picture.
The next step will be to make a true coin cell out of this. Time is short, but if we are doing our best effort to hack everything together just right to meet the deadline.