The time to print all of the parts is roughly 72 hours. We typically give a two week lead time for projects this large.
I hope you understand that this is a large volume of material and time for printing and I have to follow our pricing model. As with any manufactured item, the method of manufacture has a lot to do with the final price. Our pricing model is for our machine and expertise and I cannot change that model for your project.
Please let me know if you have any future 3d printing needs.
Received 2nd quote from another source. $732.56 for all the parts. I'm guessing most people here will just order from OpenBCI or by their own 3D printer. I'm so confused over all of this. I still cannot believe these pieces of plastic should cost so much. I recently ordered a strap on velcro headband which I'm not really loving but it does work with the dry electrodes. I was surprised I was able to get decent signals. They worked even better with a shot of gel. How come no one is discussing anything on this thread? lol
The FRI combs seem to work better and require less pressure with the Ultracortex (versus the velcro), since the spring pressure is directly pressing down on the scalp. With the bands that can only be achieved with significant tension on the bands. I think one reason they suggest using a chin strap.
I've also read on a blog post that injecting the gel into the comb, somehow affects it's lifetime,
They are composed of a conductive AG/CL coating of a conductive plastic. They should be able to be used at least 20 times. The limiting factor is that the coating will be removed through multiple attachments of the electrode lead.
Yes, I use Ag-AgCl buttons in my own saline velcro setup. (Which does not require high tension on the bands.) The buttons I use last a long time, more like 40 sessions.
Jonathan @strfry however made that comment about the gel accelerating degradation. Perhaps if the gel gets on the back of the comb where the lead clips on; easy for that to happen since the hole is so close. Then the dissimilar metals 'battery' type action between lead clip and the chlorided silver may cause the corrosion. Maybe Jonathan will comment here.
it's the base in which the quick connect attaches to the electrode. It sorta snaps in. I can see how that would remove the plastic coating sorta like enamel on teeth.
I believe those are the Pamel Hungarian net and post systems I mention on the 'commercial' tab of my velcro site. They are imported to the US here by STENS. The Netherlands distributor you show just shows the Comby form. They also make the post type, which can be used with saline,
Oh I think I get it. Those grey, hard plastic bridges can be placed anywhere. They seem like they might have small springs in them as well. So from there could a dry electrode be connected?
I don't believe the bridges have a spring, just a post that screws in or out. When used with a saline setup (vs paste), the post (closest to head) is placed down on about a 1.5" square or circle of flannel cloth. Then an o-ring or rubber band holds that cloth on the head of the post. Finally the cloth is moistened with saline solution and the lead attached.
If you wanted to use the FRI combs with this idea, it's possible you could 3D print an alternate bridge that would fit the dry combs. Making your own bridges sounds easier than trying to machine a metal adaptor for the screw post.
Comments
I hope you understand that this is a large volume of material and time for printing and I have to follow our pricing model. As with any manufactured item, the method of manufacture has a lot to do with the final price. Our pricing model is for our machine and expertise and I cannot change that model for your project.
Please let me know if you have any future 3d printing needs.
http://openbci.com/forum/index.php?p=/discussion/138/buying-dry-active-electrodes
The FRI combs seem to work better and require less pressure with the Ultracortex (versus the velcro), since the spring pressure is directly pressing down on the scalp. With the bands that can only be achieved with significant tension on the bands. I think one reason they suggest using a chin strap.
I've also read on a blog post that injecting the gel into the comb, somehow affects it's lifetime,
http://strfry.org/blog/openbci-hardware-review/
William
to be used at least 20 times. The limiting factor is that the coating will be removed through
multiple attachments of the electrode lead.
Jonathan @strfry however made that comment about the gel accelerating degradation. Perhaps if the gel gets on the back of the comb where the lead clips on; easy for that to happen since the hole is so close. Then the dissimilar metals 'battery' type action between lead clip and the chlorided silver may cause the corrosion. Maybe Jonathan will comment here.
William
http://www.pamel.hr/index.php/en/proizvodi/eeg-kape-elektrode-pribor