Mark Hindess  and I finally got a working solid state bed probing solution working

3D Printing
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@Mark_Hindess and I finally got a working solid state bed probing solution working reliably, Force Sensitive Resistors, Add’s about £20 to your BOM. :smiley:
http://www.youtube.com/watch?v=WkO17GFqjZg

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is the resistor mounted under the bed?

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Heck, I like your filament management, too! Will you have a writeup?

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This is exactly what I’m going to do to my kossel once my parts arrive :smiley:

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@Mike_Miller that’s Mark’s finger.

PS.
What part are you talking about?

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@Bracken_Dawson the way the motors are mounted vertically under the build plate, I haven’t seen that before.

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@Mike_Miller that’s not filament. It’s the lines that move the carriages.

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Oh right, yes, that’s standard Cerberus from @Steve_Graber

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I’d really like to see how you put all the pieces together for the fsr setup. I’ve got a set on order from adafruit so I’m about ready to implement it myself. Also, what are your thoughts on accuracy and repeatability of the fsr probe? Nice Cerberus btw!

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Thee in parallel with no other parts, connected to the E2 thermistor input on the RAMPS. I suggested we use the smallest available FSRs with the longer leads for ours, which wasn’t really necessary. We were only able to get consistency with little nylon spacer discs on the centre of the FSRs, they seem to be more sensitive in the middle. Also this would help if we install a heated bed, FSRs are good to about 80C I seem to remember. Mark has a version of Marlin now that takes a raw ADC reading just before the first probe, then looks for a >20 reduction in this value as contact, as the initial reading depends somewhat on how tight the bed screws are.