Wow, that was exciting…
My Samsung S9 battery bloated up popping the back cover open. I bought a replacement and was in the process of changing it when the old (bloated one) shorted somewhere inside in the bottom corner of the battery. It started by glowing in one small point then the whole thing started sizzling making lots of smoke. I tried to take it outside but made only a few steps before the whole thing got hot and scary to hold in hands, and I had to drop the phone. The battery remains popped out and started glowing red (I’m not exaggerating) then caught fire. Fortunately that main burning piece of the battery landed on the concrete part of the floor. The pieces that landed on the carpet were so hot that they melted it. Those were not thick big pieces that can absorb a lot of heat, pretty much just a copper foil.
The tip of the day: BE VERY CAREFUL PRYING OUT LI-ION BATTERIES, ESPECIALLY AVOID THE CORNERS.
Surprisingly, the phone still works, just the speaker board needs replacement…
For my first experimental print the nozzle temperature was 250C. That appeared to be the right temperature for printing, but a bit too high for the hotend. It looked like decreasing the temperature a little was possible. The further experiments proved that printing it at 245C works perfectly fine.
The bed was at 60C and covered by PVA. The attempts to print on clean glass at 75C and 90C were not successful.
The filament behavior appears to be similar to PLA. There’s leaking and fan is likely to be needed for printing small details. In the print pictured below the fan was always on at 30% (mostly because I was hoping it will help to keep the upper part of the hotend from overheating).
After making a few more prints the conclusion is that 50mm/s is too fast for this filament and my Makergear hotends. There was obvious insufficient extrusion of the filament in the infill printed at 50mm/s regardless of fan being turned on or off and regardless of the printing temperature being increased or decreased 5C. Printing everything at the constant speed of 30mm/s immediately improved the results.
The print on the left picture is done at 50mm/s infill, the right at 30mm/s.
The material prints nicely. It flows and leaves strings like PLA though (perhaps increasing retraction a bit will help).
I used the same slicer settings as for their (http://taulman3d.com) Nvent filament (didn’t play with any settings to make it more transparent). The extruder was at 245C although I think it could be at a bit lower (240-243 C) temperature to help with stringing. The bed was at 75. For small objects (20 x 20 x 10 mm calibration piece) it worked fine with Elmer’s glue, but the large pieces didn’t stick well enough till printed on the clear glass. I had no troubles removing those large pieces after cooling down (they pretty much got loose on their own).
P.S. I forgot to note what was the fan setting and cannot remember it now (I think I kept it off).
Long story short, I needed to source about 20lb of lead cheaply and decided to take apart an old car-sized marine battery a friend gave me.
If you ever do that (and my advice don’t) just get the contact points and the big chunks that bridge the plates. You can see the latter on the picture inside the battery case.
Getting the lead mesh from the plates is not worth the efforts. There is more junk there than lead.
Baking soda and/or pool’s PH+ chemicals can be used to neutralize it. Borax can be used too. It converts it into boric acid and anhydrous sodium sulfate (neither of which is a nasty stuff, apparently). The process is simple. First, the water is added to dilute the acid (it’s not pure, so 50/50 mix is good enough). Then the neutralizing agent is added slowly (if doing it start with one spoon to see how it reacts). The baking soda and HTH PH+ bubble when added (borax doesn’t). As soon as it stops bubbling when the baking soda or HTH PH+ is added it should be good to dispose of.
It took quite a bit of the stuff to neutralize all the acid in the bucket and its remains in the battery case. I have scavenged and dumped in a pound or two all the above chemicals till it finally stopped bubbling.
The final result: 10lb
And after smelting there were only about 6lb left.
The conclusion: a lot of time, efforts and baking soda wasted (borax and PH+ did not count, didn’t need them anyway).
The n-vent filament works well for the large items (like boxes). The 3mm blue roll I’ve got from LulzBot printed nicely at 237C hotend and 75C printing bed temperatures. The bed was a glass plate coated with Elmer’s glue. There’s only Slic3r profile for n-vent in https://github.com/dob71/x2sw_profiles
After installing the OneNote 2016 PC client it asks you to sign in to the cloud.
If it decides that you have to use a business account (i.e. you are trying to set it up on a PC that is a part of a domain), but you need to use your personal account it is going to complain. It will either say that your email address’ domain isn’t known, your account does not exist/not found or it doesn’t look like work or school e-mail.
The following registry change will make it accept a personal account. First exit OneNote app, then change the value in the HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\OneNote\FirstBootStatus key to hexadecimal 2000202.
Every time I have to set up new ESXi and add Ubuntu machine templates I’m getting into the same troubles, now writing it down to remember…
VmWare tools and clipboard are not working in Ubuntu desktop, so for the recent Ubuntu versions (14.xx, 16.xx):
1. In the ESXi host add the last 2 lines to the config and reboot:
[root@esxi1:~] cat /etc/vmware/config
libdir = “/usr/lib/vmware”
authd.proxy.nfc = “vmware-hostd:ha-nfc”
authd.proxy.nfcssl = “vmware-hostd:ha-nfcssl”
authd.proxy.vpxa-nfcssl = “vmware-vpxa:vpxa-nfcssl”
authd.proxy.vpxa-nfc = “vmware-vpxa:vpxa-nfc”
authd.fullpath = “/sbin/authd”
2. In the Ubuntu guest instead of installing the tools bundled with ESXi:
sudo apt-get install open-vm-tools-desktop
After a long unsuccessful search for something that would work for making available backup storage (WD Elements 4GB USB HDD) from my MS Windows desktop system to ESXi 6.0 server (as a datastore) ended up using old Dell laptop. It runs Linux, auto-mounts the USB HDD at the boot time and exports the mount point over NFS.
In order to avoid running it all the time, ESXi powers it up by sending wake-on-lan Ethernet packet and shuts down the laptop after backup is done. WD Elements powers on/off automatically when USB connection is up/down.
Attached is the ether-wake tool sources (with minor tweak for sendto() to work) and statically compiled binary runnable under ESXi.
The ESXi firewall has to be turned off for it to send the packet:
esxcli network firewall set --enabled false
esxcli network firewall set --enabled true
Although the main purpose of adding multiple extruder feature to the RepRap machines is to allow printing the dissoluble support material, the new RepRap X2V3 dual carriage design opens a few new interesting possibilities.
The machine supports driving each extruder hotend independently on the X axis (”Dual X Drive”, see video here http://www.youtube.com/watch?v=AEW-DNo0GxI). Its predecessor (RepRap X2) had both hotends fixed on the same carriage (similar to Makerbot’s dual extruder machines) and at relatively close distance of about 20mm. If printing simultaneously from both extruders the machine’s build volume on the X axis would be limited to the distance between the extruders (not quite useful). Because of that I’ve decided not to implement the “follow-me” mode while adding multiple extruder support to Marlin firmware.
Unlike it’s predecessor RepRap X2V3 is free to position the hotends at any distance the size of the machine allows. That makes it possible to effectively use all the build space (i.e. the build envelope for simultaneous printing on RepRap X2V3 is about 100×200x130mm). Moreover, independent carriage driving allows simultaneous printing of mirrored copy of the object. That is often required when printing parts for the dual extruding machine or any object that has mirror symmetry. These hardware capabilities have convinced me to add the “follow-me” support to the latest (v1.1.0 X2 Beta 1 as of this writing) version of MarlinX2 firmware. The command for turning it on/off is M322. Its description is available in the README.md file. The video below demonstrates the feature in action: