About

About Evil Engineering

Hi, I'm Delilah — founder and owner of Evil Engineering. With the help and moral support of a very small crew, I make stuff I think is really cool. Together we are Evil Engineering.

This is my art and my craft — an expression of myself as both a Domme and a sub, and also an artist and engineer and occasional writer and musician. This project is a distillation of what I know about design, materials, sensations, sounds, top-space, sub-space, pain, and pleasure.

I started Evil Engineering with a simple belief: the objects you touch and use every day deserve to be engineered with the same care and obsession that goes into the things that launch rockets and build bridges. And also that “cheap plastic” is bad, but “engineering polymers” are pretty damn cool. So I have applied aerospace-grade thermoplastics, layer-orientation engineering, and a frankly unreasonable amount of iteration to my creations.

Every impact toy is designed around material science, balance physics, and the specific loading conditions each component will actually face in use. The striking face and the handle aren't made the same way, because they aren't the same problem.

As someone who types a lot and is sensitive to different sensations of touch, pressure, sound, and response, I also build some really cool (and pretty unusual) mechanical keyboards. They make noise, or not. They do autocorrect in a non-annoying way. They look really cool, and they feel even better.

If you have a bad taste in your mouth from cheaply printed 3D products and toys, I would love to help wash that out. My toys are guaranteed for the life of my business. If they break under normal use, I will replace them. And they really shouldn't — I use the same materials that make riot shields, cockpit windows, drone frames, and medical devices.

I 3D print in polycarbonate, plain and carbon-fiber nylon, glass-filled ABS, and other abrasive and high-temperature materials that most makers won't touch — because the right material isn't always the easy one. Then, depending on the piece and its needs, I post-process it accordingly: annealing, vapor smoothing, hand-sanding and polishing until it's a one-of-a-kind work of art. Made both by machine and by hand.

If you've ever held something and thought this feels exactly right — that's what I'm chasing, every time.

How we make it

Our commitment to quality

We don't use the materials most 3D-printed parts and toys are made with (PLA), because it's too brittle for what we do here, too heat-sensitive for your trunk or windowsill, and just doesn't feel right in the hand or against your skin.

We believe 3D-printed parts have earned a reputation for fragility not because the technology is limited, but because too many makers worry far more about speed and cost than quality, and skip the preparation, environmental control, and post-processing that engineering materials require. We don't skip steps. Every spool is dried. Every chamber is heated. Every material gets the process it was designed for. The result is parts that perform to their rated specifications — not parts that happen to be the right shape.

We also make things that are much heavier than typical 3D-printed parts. We do not optimize costs by skimping on material quality or material consumption. We default to heavy and thick rather than thin and light.

We follow all manufacturer recommendations for material handling, processing temperatures, drying protocols, and post-processing procedures. Where our own testing has identified opportunities to exceed those recommendations — longer drying times, optimized annealing schedules, material-specific build surfaces — we adopt the more rigorous process.

Capabilities & process

We operate a fully enclosed, heated-chamber production environment built around industrial-class machines capable of processing the full range of engineering thermoplastics — from PETG through polycarbonate, nylon composites, and carbon-fiber-reinforced materials.

Our facility includes dedicated filament drying equipment capable of reaching temperatures up to 120°C, supporting the extended drying cycles that high-performance materials demand. Our nylon composites undergo 12–16 hours of controlled drying before they ever touch a print head. For materials that benefit from post-print heat treatment, we run controlled annealing schedules tailored to each specific polymer to maximize crystallinity, relieve internal stresses, and achieve the material's full rated mechanical performance.

Finishing capabilities include a purpose-built acetone vapor smoothing chamber with activated charcoal filtration for ABS products, rotary tumbling with ceramic media for edge finishing and surface refinement, and precision hand tools for detail work. Our build surface library includes specialty plates — G10 Garolite, carbon-fiber composite, and application-specific coatings — selected to match each material's adhesion requirements and deliver consistent first-layer quality across production runs.

We maintain material-specific adhesion systems, calibrated print profiles, and documented process parameters for every material we offer. Each material in our lineup has been individually dialed in to our specific machines — we don't guess at settings or rely on generic manufacturer profiles.

What's next