Z Probe Micro Switch Shoot Out! How Accurate Are They For 3D Printing? + Hall Probe testing
Channel: RWGresearch
Date: 2017-04-16

So how accurate are those little buggers? lets find out!

Also note that i did not do a "contact contact" test in the video ( I forgot)

So the results for contact to contact were: 
Total Deviation From Mean: 1.24 um 
Total max / min :  3 um

This is the lowest ( best) of everything tested.
This basically means that my delta in its current state has a resolution of about 3um +/- 1.5um for the Z access. That's not to bad that's .003mm! 
so this will need to be understood when looking at all the other data. 

Thanks for watching!! 

~Russ Gries

Links:

Tom's video / page:
https://toms3d.org/2017/03/02/autoleveling-3d-printers-9-myths-12-sensors-tested/

My Z Hall probe.
http://www.thingiverse.com/thing:2260909

Original Z Hall probe.
http://www.thingiverse.com/thing:111397

my edited Version of the hall probe from sainsmart:

http://www.thingiverse.com/thing:2260909

I use this hall sensor, its cheep and reliable. 
https://www.sainsmart.com/sainsmart-hall-effect-sensor-switch-magnetic-detector-module-for-arduino-motor.html

For my hall probe set up i use a rod from a CD/DVD player / Rom, they seem to be all the same size. 
The magnets are 3/16" cube. 

here is all the data i generated from theses test:
http://open-source-energy.org/rwg42985/russ/Projects/3D%20printer/micro%20switch%20Z%20probe%20Data/probe%20testibg%20final%20corect%20values%20.xlsx

Some old footage of me showing the z probe 
https://www.youtube.com/watch?v=80qzmwDFGVc

watch me build this printer the RWG-OSD-CNC:
http://rwgresearch.com/open-projects/3d-printing-research/oversize-delta-3d-printer/

my other 3d printing research:

http://rwgresearch.com/open-projects/3d-printing-research/