Fangs for the Scarecrow Prop Build
I've been building the scarecrow character for local haunted house attractions for about eight years now. The fangs are always the first thing that goes wrong, and they're also the easiest part to nail if you understand the geometry involved. Here's how I handle custom fang fabrication for this specific prop build. The original instructions live on a few different maker forums and GitHub-style repos. I can't link them directly since they move around, but searching for the phrase along with "scarecrow prop" or "horror fang rig" usually surfaces the right repo within the first result. There's also a slightly updated version on a couple of maker websites. The key is finding the one with the latest revision date because early versions had an error in the spacing parameter that made the fangs sit too far apart. Once you have the file, check the readme first. Most people skip this step. The readme will tell you whether your particular version of whatever slicer software you're using is compatible, and it will flag the bed temperature and infill settings that actually worked for other people who tried this.
The Basic Process
Here's what happens when you follow the instructions step by step: You start by opening the STL or OBJ file and checking the scale. These files often come out at life-size tooth dimensions but need to be scaled up or down depending on whether you're making a single fang insert or a full upper jaw tray. I scale mine to 110 percent. Anything less and they look small next to the scarecrow's teeth grid. Anything more and they crack during the curing process if you're using silicone. Then you slice it. Use a resolution of at least 0.15mm layer height. Thinner layers make the fang surface smoother but the print takes twice as long, and for this application the difference is basically invisible once you paint and seal the piece. I use about 20 percent infill with a gyroid pattern. That gives enough internal structure so the fang doesn't snap when you're gluing it into the tray.
After printing, you sand the support marks off with 400-grit paper, then 800. Don't rush the sanding. The scarecrow mask is going to be close-up work, and any visible layer lines or support scarring will pop under stage lighting.
Get the Full Details
What Nobody Tells You
Here's the thing the instructions don't cover: the fangs are asymmetrical by design, but people tend to print both left and right fangs identically and then try to mirror them manually. They're not meant to be perfectly mirrored. The left fang curves slightly differently because of how the scarecrow character's mouth opens. If you mirror them, you'll notice it within five minutes of having the mask on. Just print the correct side for each position and skip the mirroring step entirely. Another thing: the instructions recommend a standard PLA filament for the initial test prints, which is fine, but PLA is brittle at. If you're doing an outdoor haunted house in October, PLA fangs will shatter. Use PETG or ABS instead for anything going outside, and if you go with ABS you'll need an enclosed printer. I switched to PETG two seasons ago and haven't looked back. I ran into a specific problem last year where three of my fang trays cracked during the silicone pour. I'd been following the instructions exactly, but I hadn't considered that the tray base had a very thin wall section that flexed under the weight of liquid silicone. The fix was simple: I reprinted the trays with 60 percent infill on just the base ring, leaving the fang cavities at 20 percent. It added about twelve minutes to the print, and the trays survived. The cracks stopped.
Materials and Adhesion
For the actual fang material, I use a two-part silicone moldmaking compound rated for dental-grade use. It costs more than craft silicone, but it's the difference between fangs that stay in place and fangs that fall off during a three-hour run. The instructions mention a generic silicone option, but that stuff has a tensile strength that's basically paper compared to what you need here. When bonding the fang to the tray, I use a cyanoacrylate glue with a thin consistency, not the gel version. The thin CA wicks into the micro-interfaces between the silicone fang and the printed tray and creates a much stronger bond. Gel CA sits on top and fails under stress. This is another detail the original instructions gloss over pretty quickly.
Timing Estimate
A full set of fangs including the upper and lower trays, printing time, sanding, silicone casting, and final gluing takes me roughly three hours from start to finish on the second or third build. The first time I did it took me closer to four and a half hours because I was reading the instructions as I went and making mistakes I wouldn't repeat. After that it's mostly muscle memory. If you're on a tight deadline, you can skip the sanding step and go straight to a light coat of fill primer. It hides layer lines adequately and cuts twenty minutes off the process. Not perfect, but functional when you have ten masks to prep in one afternoon.
