Removing Hot Mirror from Viewsonic

[Randy Siers]

Hey guys, new here but not to 3D printing, FDM, anybody have instructions on where the hot mirror is and how to remove. Also is the replacement mirror with better UV transmissivity available? I have not got a successful print yet, actually nothing. Even using 2 min burn times. Rechecking everything, projector setting etc. The vat has a film on it that I have been unable to clean using Simple Green. I am using the MJ red that came with the MUVE printer, which was a prebuilt model. Also using the Nanodlp presets, but increasing exposure times. I finally got a a very thin print just a few layers sticking to build plate. No more. Thanks in advance. Thanks to Dean and the MUVE team for their support so far.

[mUVe 3D Admin]

Randy,

You'll find the instructions for the hot mirror that you're looking for on the documentation page on our website.

http://www.muve3d.net/press/muve-1-documentation/

Just look for the "Hot Mirror Removal" link toward the bottom of the page.

mUVe 3D Support

[Gauthier Quercia]

hi, 

I'm using my projector sometime to watch the ood movie when friend are around ...

Will that prevent me to do so?

[Hellenicopter]

No, it should be OK.
But it would be better if the hot mirror is replaced by another one that lets more UV to pass while still blocking the NIR wavelengths.

[Piotr]

Hi

I have projector PJD 7820HD

Maybe hot  mirror replacement like this: https://www.edmundoptics.com/optics/optical-mirrors/hot-cold-mirrors/25mm-square-0deg-aoi-hot-mirror/ (Part No. #43-843 or #46-588) will be suitable ?

optionally one of this:

http://www.koppglass.com/filter-catalog/uv-ultraviolet-filter-glass.php

?

[mUVe 3D Admin]

Piotr,

From our experience the hot mirror in the ViewSonic isn't 25mm square. If you find that it is, then yes you can swap the part out to your desire for the expected effect of getting only the UV spectrum you're looking for.

Our new 4K line specifically supports this and we're finding it very helpful for troublesome resins.

mUVe 3D Support

[Agostino De Giorgio]

Any suggestion on how to cut the hot mirror to the same size as the default one?

[Hellenicopter]

Hi,

Keep the protective film on the new hot mirror, put the old one on top by paying ATTENTION to the orientation as one of the faces has the reflective coating (the protective film should have a mark showing which side has the coating). Some hot mirrors have a beveled corner to avoid installing it in the wrong way so you need to check that too so that it corresponds to the right orientation of the mirror's reflective face.
Draw the shape of the old mirror on the protective film with a marker.
Use a diamond cutting wheel with a minitool (Dremel, Proxxon etc) and start cutting very very gently (you keep the protective film on the mirror on BOTH sides during the cutting operation!).

I hope that helps.

Cheers

[Resinator]

Just used a small diamond wheel to cut the Edmund hot mirror listed above, from 25mm square to 20 x 25. It fits the Viewsonic nicely now, no problems.

The new mirror had a V mark on one edge. I'm quite sure it points toward the coated face, despite a lack of documentation on that. It is handy to have that mark on the edge not the protective film, so don't cut that edge off :)

As @Hellenicopter says, go very gently. I took about 40 passes to make the cut, half from each side. 

I've done quite a bit of glass cutting and grinding with diamond wheels. Normally I flood the cut with running cold water to keep things cool and keep glass dust out of the air. That still sprays glassy mist around, WEAR A GOOD RESPIRATOR in any case when grinding glass!

In this case I wasn't sure if the coating would be affected by moisture, so I paused very couple passes, dipped the wheel in water and let the glass cool for a moment. And I worked outside. Did I mention wearing a respirator?

BTW I also moved the color wheel out from the light path. Disconnecting the motor causes an error, so I secured it off the to side of the lamp housing. Don't really know how much of a difference this makes, but as long as I had the projector in pieces, why not.

Cheers