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Printrbot Z axis microswitch poker.

by eddiema, published

Printrbot Z axis microswitch poker. by eddiema May 21, 2012
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Summary

A glue on mod to move the z-axis homing adjustment to the front right of the printer.
Note that there was talk of reserving this area for a spool holder.
The switch is mounted on the regular ZEST part.
Version two uses splines to lock the screw so it can't rattle out of position.

Instructions

3d printed and tested but slic3r (at 0.2mm) does strange things.
There are no errors reported by slic3r or netfabb but in my case it added a single fill layer to the hole and printed the back and side walls hollow.
The hole is small and intended to be tapped to M3. There is enough material to allow larger threads to be used.
I printed in PLA and superglued it to the existing ABS part.

Version-2 is a bit more challenging. The pieces fitted together with minor filing and clean up but I don't know how well this will work when printed on another printer.

When completed the large knob with internal spline locks the two 10 tooth splines together. To adjust you lift the knob off the lower spline and rotate. When in position lower the knob to lock again.

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I printed one of these off and it appears that your mesh is not solid enough.

I tried it at .2mm and no doing. Then I tried it at .5 and got the same result as you did, a lot of space where there should be solid plastic.

One question, where is the switch holder? It does not seem to show up in anything.

Also, I used STL to dxf in order to pull version1 into Autocad and am redesigning it from there so I can see what happens with an Autocad export to STL.

There appears to be an issue with slicer in sketchup as well as the other slicing module. It certainly does not have the same amount of parameters as the external version does.

stovey

The STL does not determine how solid you part is - the slicer does.
There is no slicer in sketchup. As far as I know the STL is valid.

Slic3r does have issue with thin walls etc which can usually be tweak by changing the parameters. Changing layer height does change the way slic3r does the walls but this has nothing to do with SU. I can't make the part bigger or it hits my fan mount. The forces on the screw are small so it worked just fine with a follow wall for months. It did not fail but eventually I added the part to the X-idler part.

My switch is on - http://www.thingiverse.com/thing:22358http://www.thingiverse.com/thi...

pb_z_end_stop
by eddiema

Thanks for the link to the switch holder.
I have the PrintrBot Plus Wood version.
I was thinking of redoing the whole thing and then, as I was looking at your image above, and this time actually seeing what the picture shows, I realized that I will have to mod your base which didn't print very well for me anyway.

I'll just redo the whole thing in OpenScad and see if I can get a bitter object while learning more about OpenScad.

Thanks again.

Good luck with OpenScad. I've played with free-cad a little but didn't get very far. One day I'll get there.
Ciao Eddie,

After installing a fan last night on my extruder I ran out of Z stop adjustment (fan mount lifted extruder up), so this will come in handy! Thanks Eddie!

I'm using the V1 model now. Acetone worked great to join the two pieces in ABS. Moving he Z stop adjustment to the front is a big improvement.

That's exactly how I bodged my Zstop together on day 1 (except I used the Xstop "update" bracket for it) and I really like it.

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