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New VAT + DuPont Teflon FEP Film

December 11th, 2011 10 comments

Time to marry these two together.

For now I’m just folding the film in place.

I used some clips and an old ruler to cut two pieces 95mm in length:

and stretched the Teflon Film on top of the glass. It kind of clings to the glass by itself.

Just secured it on two opposite sides:

That is it for now… Later!

 

Categories: VAT Tags: , ,

Got DuPont FEP Teflon?

December 11th, 2011 No comments

Got Milk? No?

Got DuPont FEP Teflon then? YES!

First Impressions:

It is a plastic, clear and somewhat like cellophane used in the floral business. There is an adhesive backing version, so
that would be the one to get, but could not find a source for it. In my neck of the woods DuPont does not even import or distribute the FEP film(Fluorinated
ethylene propylene). When you heat it up it becomes more flexible. I wrote about
this in http://3dlprint.com/2011/11/what-will-happen-if-i/.
I had a small sample piece then, now I have a much larger sheet, also thicker.
when I unroll even 5~10cm it is statically charged. It is hydrophobic, rather
resinophobic i.e. it repels resin and forces it to try to minimize the contact
surface.

I placed a drop of resin and spread it around:

as you can see just on its own it tried to form a sphere.

The cured resin is released easier than silicone, but not by that much.

What helps is that it flexes and literally peeled off the cured resin.

There were no ill effects to the film after polymerizing a drop of resin on top of it.

I wiped it with a cotton cloth and then paper towels with Isopropyl Alcohol.

Clearly “THE SECRET” ingredient in a lot of printers.

More to come…

 

Categories: VAT Tags: , , , ,

New all glass VAT

December 11th, 2011 2 comments

That time of the year for a new VAT again.

After some calculations a few posts back I realized I will have to add resin midway if I print a larger object, hence the current post and need for a bigger VAT.

If you need to print a smaller item, the VAT may prove too big, but you can always drop a block of 70mm x 90mm x 10mm glass and use less resin.

This time it is all glass with a bit of 100% silicone.

BOM:

1- 200mm x 150mm 5mm soda lime glass ( regular window ).

2- 200mm x 20mm x5mm of the above.

2-100mm x 20mm x5mm  of the above above.

Mark the location of the walls lightly with permanent marker.

Spread some silicone on the bottom edge and the side edges and repeat on all 4 sides.

Use some tape to hold the glass in place after you glue it. Leave it undisturbed at least overnight.

I slid out the glass window, but left the aluminum rails and inserted the new VAT and tightened the grub screws.

 

 

Perfect fit!

Cheers!

Categories: VAT Tags: ,