Printrbot LC+ Z-nut Keeper

by PacificBlue, published

Printrbot LC+ Z-nut Keeper by PacificBlue Sep 2, 2012
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Sometimes gravity & alignment aren't enough to keep the bridge from hanging-up on descent, these keep the Z-rod nuts in their wooden slots to make sure the bridge descends everytime, no surprises.


I made these to clip on the back of the bridge so they wouldn't detract from the beauty of the Printrbot. After printing, remove support scaffolding under top clips. Place into upper wooden slots first & press down, then slide their feet (keepers) onto the Z-rods and press flat.

The left side mounts inside the left tower, the right mounts on the back (remove long screw & nut to gain clearance, replace when done) see photos. You -do not- have to remove the pulley & belt.

Both pieces have a slight overhang, so don't forget to enable "support" or "scaffolding" when slicing & remove them after printing. Use a fill density of at least 50%.

Edit 9/3/2012:

  • Thing name corrected: now "Z-nut" (thanks tschutter, long night)
  • Z-nut Keeper L v2.stl uploaded: a) taller b) top clip no longer hits Z-rod (deleted v1)
  • Added photo: Z-nut Keeper L v2 inside left tower
  • Instructions improved slightly.

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Thanks for this. I should have made these long ago. They printed perfectly w/o support, fit well and do exactly what they're meant to.

I only needed the right one, but it printed very fast and fit perfectly, no-tools installation. Simple, elegant design and it does the job, I like it!

I just printed these, and they fit great. However there is one caveat. If your print bed is still at the stock height and you try and home your Z axis it might not actually be able to get all the way down to the print layer.

thank you...... SO..... MUCH!

Thanks - Thing name corrected, improved Keeper L v2 uploaded (taller
amp; top clip no longer binds on Z-rod).

Keeper L -will- mount inside the left tower if you turn it 90 CCW to drop it into the hole, then rotate back, place upper clip into wooden slot first
amp; presss down, then push foot onto Z-rod. Keeper L v2 is even easier to mount, I deleted the original one.

agree with tschutter.

just printed these and installed. awesome! i had put a nut on the top on the right side so at least drop the bridge if it got stuck. ya i know it shouldnt do that, but it does and i dont have replacement bearings yet. these clips work great. so simple and effective. even better too - my bridge dro
ps with less jamming than before. thank you!

ps. the pic you have of the left one doesn't seem to be right. i put the clip on the front.

Uhh...those nuts are on the Z-rod. This should be titled "Printerbot LC+ Z-nut Keeper".