RepRap Endstop
by nophead, published
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Summary
An alternative design for the RepRap Darwin Z endstop. It allows the machine to home the z-axis away from the workpiece, so that homing is always a safe operation, regardless of what state the machine is in. More details in my blog: http://hydraraptor.blogspot.com/2008/08/alternative-z-endstop.html
Instructions
Print the parts with a RepRap. If your ABS is not opaque to IR you will need to paint it with something that is or wrap it in tin foil. I used black BBQ paint.
Fasten the tab to a bed corner bracket with two M5x15 bolts. Attach the opto PCB to the opto bracket with two M3x12 bolts and fasten the bracket to a vertical post with an M4x20 bolt.
Adjust the opto bracket angle so that the tab clears the slot and set its height to where you want the z-limit to be.
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Even though this part is deigned for Darwin, it works great on Isaac too! I am going to post my designs for the printable Isaac flag I am making, once I clean it up. It should probably work great on Mendel as well.
I found wrapping in aluminum foil and heating with a lighter, followed my a cool down on a flat surface creates a strong bond with the PLA I am using to create a IR resistant surface..
Yes but you don't want it IR reflective either as stray IR light can get in if it is.
Nice improvement over what I 'slapped together':
http://blog.erikdebruijn.nl/uploads/3DPOptoswitchbracket4.serendipityThumb.jpghttp://blog.erikdebruijn.nl/up...
Having a reference point away from the build platform definitely has some advantages.
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