Printrbot LC Z Stop Dial
Description
Instructions
I printed the stl using normal 40% infill. You will probably need cooling as the long shaft prints fast. While the print is printing, cut the head off of a 2 inch 6-32 screw. Once printed, insert the cut end of the screw into the hollow end of the knob. You may be able to just screw it in with pliers, or you may need to drill it out a bit, or glue in the screw depending on your print quality. You can remove and replace the existing 6-32 z stop screw with your new one. I find it helpful to mark the top with a Sharpie so I know how far I turn it. From my calculations, each revolution of the knob should move the z axis stop about 0.79 mm.
Update: added a second version with a thicker knurled knob if that fit's your design better.
Update: Per Michele31415's concept a dial with a pointer has been added.
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I put an optical stop on my Printrbot. with that I really needed to hold the Z stop bolt better as any wiggle causes the optical stop to change. so i made this thing: http://www.thingiverse.com/thi... . I have a micrometer head coming that will replace the knob so that I can precisely adjust the Z stop length have a graduated reading of its position.
Brilliant! Every Printrbot should come with one of these. I liked the idea of a pointer so I did a little mod to add one to the knob itself, thusly:
union() // Join the knob and the pointer together.
{
cylinder(h=3,r=10) ; // Make the knob.
// Add the pointer to the knob:
translate([0, 10, 0]) triangle_prism (2, 4) ;
}
I love your knob! I've added it to my spring loaded Z stop bolt set up. I was going to print a plate that would centre a screw driver down to the screw. glad i didn't bother because your knob is a better solution!
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The "customize" parametric model didn't work for me - it left an open space in the knob part and then started extruding the shaft into thin air after some number of layers. I had increased the knob thickness and shaft length. (This sounds dirty as I read it....)