screwable y-axis bushings for prusa

This is a concept to get around gluing the PLA bushings onto the y-bottom-plate.
During the assembly of the prusa they get fixed and if one changes anything on the y-axis they have to get removed and re-glued to fit accurate again.
We noticed that the fine tuning of the prusas bars needs some time.
Even after checking orthogonality of everything one has to change some screws later on.

Here the bushings get screwed onto the y-bottom-plate.
The holes are M4 holes, but the bushings get fixed with M3 screws to have a little space to adjust their position.

Simply tape the y-bottom-plate with a suitable tape.



Then find the correct position of the bushings on the plate.



After adjusting the position of the bushings one can mark the holes with a pen.



To be sure to find the correct position after drilling it is recommended to mark the upside of the y-bottom-plate.
The holes in the bushings are symmetric so you can switch them to the upside.



The holes get drilled with a M4 drill using a drill press.



Here you can see the mounted bushings:

The files are as always on thingiverse.

Have fun with these screwable y-axis bushings.

If you don't have a 3D printer yet buy them at: www.2printbeta.de

 

Kind regards

BonsaiBrain

 

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LM8UU x-carriage bearing insertion

Here we want to present a short foto story about how to insert the linear bearing into the casted LM8UU x-carriage.

The linear bearings LM8UU are a great substitute for the PLA bushings.
A good model can be found here and is tested to be perfect fitting for the linear bearings.

The casted parts also fit perfect as they are a 1:1 copy of the printed version. Sometimes the bearings even don't need a zip tie to be fixed onto the x-carriage.
But sometimes they fit a bit too tight. When trying to snap in the linear bearing by force the x-carriage may break or gets cracks.



To be sure the parts don't break when inserting a linear bearing, we recommend to use a hair blower on highest heat-level to warm up the part to 100 °C.
As alternative one can use an oven to warm it up.


After this it gets a bit flexible and it is not too hard to get the linear bearing into it's cavity.
It is better to insert it side by side and not both sides simultanously.



With this method the clamps don't break, the linear bearing fits perfect and after cooling the part is ready for use.

Greetings from the lake of constance
BonsaiBrain

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