So I havn’t been on here much lately. Just getting back into G+ really. I’ll try to be back on here more, as I’ve always felt a lot more connected with the 3dp guys on here than anywhere else. On that note, some cool stuff has been happening. The Eris is looking like it’s about to be FINALLY done, and should be starting on it before christmas. Huge thanks to @Johnny_Russell and UltiMachine for helping out with the last few sparky bits. The one that’s the most interesting is the hotend platform probe. It’s an accelorometer, similar to whats used on the FPV racing drones I’ve gotten into. I had the idea one day, and came home and strapped one on my Orion and ran it down and ‘bonked’ the table. Bam, inspirational. Plenty of fun times picking a name for it, some have already named it, but most are NSFW lol. Anyhow, hope to see everyone at #MRRF this march 18-20th. I’ve heard a few guys are bringing their fpv racers too, and the fair has given me the green light to fly that weekend all around the fairgrounds, which are HUGE, but an AMA license is a good idea to have if you wanna come fly too.
We tried accelerometers in the very beginning and couldn’t manage to get them reliable enough for probing. How’d you guys manage it?
Not 100% yet, but really close. Tonokip was hoping to use the DIO pin that’s built in to the MP6050 accel but it wasn’t good enough resolution. The analog readings were looking really good on the software for the quad, when i tested it at home, so they’re working on getting that reading into firmware to establish deadband, then add a tolerance, and take a hit from anything higher than that
If you guys are putting that much software work into noisy hardware, take a look at load cells too. Airtripper did that whole load cell to detect filament pressure bit, but I suspect if you reverse it, you could not only use it as a touch probe, but also as filament skip detection, etc.
If anyone would be able to make it work, it’s you guys.
http://airtripper.com/1338/airtripper-extruder-filament-force-sensor-introduction/
Hah, thanks, but I just have the big pic ideas, @Johnny_Russell and his guys have been figuring it out 
Very cool! Excited to see the Eris make it out the door. I keep checking the website ;). MRRF!
The M3D printer extruded uses an accelerometer (or a tilt sensor) to detect the bed during homing. It is a Cartesian so the extruder moves slightly to allow it to work which I don’t care for because it is susceptible to pull by the filament.