Introduction: Large Stencils Via Projector

Sometimes you need to get your design onto paper or whatever you use, and a plotter is either too expensive or unavailable. If you have a projector, your day is all saved and stuff. See how.

Step 1: What You Need

Well, I think you could theoretically use lots of stuff, but here's what I used:

-stencil material
I like to use very thin polycarbonate plastic. You can get large 2'X4' sheets for ~$2 from mcmaster.com
-stencil design
I usually do either pure photoshop vector or image manipulation with the cutout filter
-projector
We had one around the office for playing Halo on.. I mean... meetings.
-permanent marker
Any kind will do, but Sharpie has my money.
-cutting knife
I like exactos. If you cut anything thicker than .004" polycarbonate, try getting the thicker-handled ones.
-fresh, sharp blades
Cost: ~1.50USD. Benefit: Much, much easier on your hands.
-cutting mat
I don't really care that much about this- I only have this nice one because I rescued it from a dumpster. Cardboard will do in a pinch.
-tape
Anything will do, even tacks if you don't mind holes in your wall. I had cellophane tape handy.

Step 2: Design Stencil

I like using Photoshop.

For colors like this light blue, you can lose your mind trying to trace the untreated edge... or you can slap a 1-3px black stroke on those layers.

Step 3: Project Stencil Onto Wall

Use a projector.

If you're concerned with scale, you can project a few elements with a defined scale, and adjust the projector until it fits.

I wasn't really concerned with that, and I don't think many people making stencils will be.. so I skipped it.

Step 4: Tape Up Material

Use some tape or tacks to put up the material so the image projects onto it decently.

Step 5: Trace Stencil

Carefully trace the stencil projected onto the material with the marker. It's kind of a pita to do this accurately, especially with lots of caffeine and/or energy drinks in your system. I suggest a good portion of healthy fruits and/or veggies and a stool to steady yourself.

If you had to do this a lot, I'd suggest a setup with a large transparent glass table, and the projector below it. Tracing things while seated is much easier than doing it perpendicular to a gravity well.

Actually, that makes me think... I wonder what tracing something in zero gravity would be like? I think you might have to brace yourself of a bulkhead or something of the sort.... weird.

Anyways, you'll likely need to modify your design for contiguity- an island of material will fall right out of the stencil, you need to build it with little 'bridges' to connect it with the rest of the stencil- see the images to see what I mean.

A technique I like to use to double-check what I draw before I cut it out is to simply draw a little X on the bits I'll be cutting out, then stepping back and imagining them all falling out.

Step 6: Cut Stencil

Now's the fun part. Grab your knife, once-over the design again to make sure you haven't screwed it up, and start cutting it out.

Make sure to use the cutting mat, or you'll have your mom / significant other / whinydude on your case.

Step 7: Go Spray Something

Now go take your stencil, and, in a place that's nice and legal- like your basement- spray paint through the stencil.

Comments

author
pkostin made it!(author)2011-07-05

Question: I'd like to do this, but not with a video projector, rather an old school overhead projector--the ones from grade school. So my questions are 1: while standing in front of the projection to cut, does your shadow obscure and interfere much? 2: Silly question, colors show well on these overhead projectors, right?

Thanks,
Pete

author
vrogy made it!(author)2007-10-17

@kbacalis: part number 85585K102 should do it.

author
kbacalis made it!(author)2007-10-17

this instructable is great! When ordering the stencil material on mcmaster.com, i am having trouble navigating....what exactely do i need to order. I would like to purchase a roll or this plastic like you have shown in the picture. Thank you for your help.

author
klaus made it!(author)2007-04-29

This is actually the method that sign makers used before the advent and broad usage of plotters. Back to the future.

author
japala made it!(author)2007-04-25

I used the same method but masked out the surface to be painted straight from the projector image. That big eight ball is spaced from the wall so I was able to add some lighting behind too.

http://www.allthemods.com/userinfo.php?userid=1&id=262

author
Benedikt.Seidl made it!(author)2007-04-24

if you don't have a video projector you can print your stancil (tiny) on transparency, cut it, put it into a slide and project it with a diascope. i used this several times with a laser-printer and it worked perfect.

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