Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

adjustment-free Z endstops and wobble isolator

by profezzorn Sep 5, 2012
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Yes it would. (In fact, it says so in the Instructions)
It might require some firmware hacking which I have not done. (yet)
I'm working on re-building parts of my printer, so I might do that soon.

It occurs to me that this thing could be made much better if we replace the switch with a pressure sensor.
That can be made much more sensitive and wouldn't have to push very hard on the bed, which would make it better suited for bed leveling.

actually i "hacked" the firmware (enabled the bed leveling) and it works. it touches three corners,
but i haven't made it print yet. I had some issues with the auto bed leveling that the firmware was to big for my chip (atmega644p) so some features used by it had to be left out.
i hope it'll let me print nicely :)

oh and sorry for not reading the instruction, could have saved me lots of time :)

have you seen http://www.thingiverse.com/thing:220709

that might be a better solution.

because the contacts would be more reliable ?

Auto touch Z end-stop
by radus

Microswitches are always going to be more reliable than metal-on-metal, metal-on-metal has much shorter switch distance though, which can potentially make it more accurate. I think either solution would work fine in practice, as the basically do the same thing.
(I've been running my printer with my solution for ~2 years with little or no maintenance, so obviously I'm pretty happy with my solution.)

i just had an idea, could you use this for auto bed leveling ?

i don't really see how it works. does it move up and down with the threaded rod ?

Yes. it moves up and down when the threaded rod spins. The X axis rests on top of it. Once it goes low enough that the X axis rests on the print surface, the switches activate.

excellent idea! no adjustment needed. i'm also using Jonas Khulings X ends without the top constraint nuts so this design is perfect.

See the "derived from" link.

Nice. I had a similar idea, but I was going to have the extruder lift from the X carriage instead of lifting the X axis off the Z screws. That might be light enough to take the flex of the print bed out of the adjustment.