[COMMUNITY] Z axis endstop

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HALFORD
Posts: 128
Joined: 26 Aug 2015, 12:19
Location: MANSFIELD, ENGLAND

[COMMUNITY] Z axis endstop

Post by HALFORD » 21 Nov 2015, 23:07

This thread was started by Replicator & Endeffect regarding z end stop wobble see here https://beeverycreative.com/forum/viewt ... =z+endstop ,
This also spoke about redesign of the Z AXIS ENDSTOP which
Replicator made a good suggestion to imrove and made a sample part.
I also have been working on this design and would like to share it with you fellow bee's;
The concept only uses 1 screw and is much more stable and gives repeatable results.
The design was done in solidworks, and imported into the complete assembly to verify fit and fucntion.
The design principle locates in the spare screw hole of the Z axis motor and gives a fixed position in Z. The body locates against the Z

axis guide rod in the same way as the original design. The part cannot swivel around the guide rod as it's fixed by the screw hole.
The design incorporates 2 location dowels for the switch & a simple snap hook to secure the switch in place.
The design principle gives the following benefits; 1 piece of hardware screw, simple fit / location, easy snap in to place, secure fixing,

repeatablility, simple to print part.

Here is the design model; http://postimg.org/gallery/1pnwuu0my/

Here is the design stl model showing support structure; http://postimg.org/gallery/1g3trklve/

Here is the switch assembly; http://postimg.org/gallery/2b43valdm/

Here is the printed part; http://postimg.org/gallery/ft7wbsfu/

Here is the assembled switch on the prusa; http://postimg.org/gallery/3a2ugjs8q/

Here is the stl file; http://www.thingiverse.com/thing:1148065/#files

Here is how to remove the switch using a small bladed scredriver; http://postimg.org/gallery/191bm9y2i/

About the support structure and how it was generated will be covered in a seperate post.

I will also post the print settings as well.

Tools used; 1 3mm allen key, 1 M3 screw, option spacer washer as per display spacer. File to clean up any sharp edges. Needle nose pliers

to remove support structure.

Process steps; Print the part.
Remove the support struts with pliers, fairly simple.
File away any overspill on edges and sharp corners.
Pay particular attention to the snaphook and dowel area as there may excess material stuck between the gap, I found a sharp knife works

best to get in the difficult to reach area. Be carefull not to break/damage the snaphook.
Fit the M3 screw/washer into the hole.
Move the Z axis away from the bed at least 70mm.
Fit the part to the motor screw hole / Z guide rod, Do not overtighten the screw.
Slide the endstop switch into the location groove and line up the holes on the dowels.
Snap into place by pushing againts the guide rod, do not force it. If it will not go over the snaphook check the gap is clear behind.
I had one break off by too much force!
Connect the switch.
Adjust the Z axis screw to be safe of the bed and recalibrate to the table.
I also added a nut to the adjuster screw to cive good contact on the switch.

If you look at this image of the coupler http://s20.postimg.org/vdyicc7ot/DSC05074.jpg you will see 2 white marks to show the final

refernce point, this is a good indicator that it repeats to the same place once set.

Happy printing...:)

dbarciela
Posts: 39
Joined: 01 Oct 2015, 19:28
Location: Porto, Portugal

Re: Z axis endstop

Post by dbarciela » 21 Nov 2015, 23:20

Are you sure you published your part in thingiverse? In thingiverse you can save a "thing" without publishing it, the link seems broken to me, that's why I'm asking.

Edit: I just found your profile in thingiverse and it shows 0 designs

User avatar
DNeves
Posts: 264
Joined: 09 Oct 2015, 10:32
Location: Portugal

Re: Z axis endstop

Post by DNeves » 23 Nov 2015, 11:40

Hello Halford!

Congrats for the commitment to improve this situation. Personally I didn't have any problems with the solution provided by BVC. In fact I consider it very easy to use and tune. In fact when I'm leveling the bed, if the distance between the nozzle and the glass is the same in every corners of the glass, but it's too high, I adjust the Z end stop screw to ease this process. :)

But good job.

dbarciela
Posts: 39
Joined: 01 Oct 2015, 19:28
Location: Porto, Portugal

Re: Z axis endstop

Post by dbarciela » 23 Nov 2015, 19:37

I don't notice any wobbling or mechanical issue with my z-endstop, but I don't think it is very precise. I've seen some videos in youtube of people that remove the metal switch and make the screw touch the red button directly, I'm very tempted in trying that but I'm also lazy :lol:

HALFORD
Posts: 128
Joined: 26 Aug 2015, 12:19
Location: MANSFIELD, ENGLAND

Re: Z axis endstop

Post by HALFORD » 24 Nov 2015, 12:10

Item is now published on thingyverse.
Seems an issue with chrome not accepting it.

dbarciela
Posts: 39
Joined: 01 Oct 2015, 19:28
Location: Porto, Portugal

Re: Z axis endstop

Post by dbarciela » 25 Nov 2015, 19:55

Thingiverse is buggy, I have very hard time changing "default pictures" because it usually doesn't save it.

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