Monday, February 16, 2015

MendelMax3 - Upper LED Mount

This compliments the MendelMax3 - Lower LED Mount that I created earlier.

The upper mount is quite a bit bigger, so I need to have my MM3 working well enough to print something large, and I've finally reached that point.

Similar to the lower LED mount, this one is made up of 3 parts: a back, an LED Holder and a Shield.

I initially had problems with one end of the shield lifting when I printed it, so I created a variation with a brim at either end.

It turns out that the white plastic piece is about the same thickness as the U-channel that runs across the top of the printer. I wanted the white plastic piece to be right up against the metal, so the way I designed it you need to cut the bottom off of the white plastic. This shows a side view of everything mounted and you can see the notch in the shield piece:

I used a sharpie marker along the edge:

and put a score mark using a knife blade while the platic was held in the shield:

I then scored the plastic a half-dozen times using the knife:

and was able to break off the lower pieces using some pliers:

I wound up with this in a few places, and used a file to get the edge smooth:

The trimmed plastic piece should then look like this in the shield:

 I also puut a strip of black electrical tape across the top (this is to cover a light gap that I found after putting everything together):

Oops. The slot isn't quite wide enough (the LED on the left is partially covered):

That's what a nibbler is for (I'll revise the model to make the slot a few mm wider):

Here it is with all of the pieces together (except the diffuser):

This is what it looks like once its all installed. I used 4 M3x25 bolts and nuts to mount it:

This is the light leak I was talking about earlier (that I covered up using electrical tape):

I ran the wires in the back channel of the 2040:

I used one of these clips at the top and bottom:

And cut a piece of black posterboard to cover the wires (you can see the posterboard in the rear slot, just to the right of the leadscrew):

My STL files and FreeCAD file can be found here.