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Carnivorous Plant
Care Research
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Dormant Trumpet Pitcher Plants and Flytraps

Objective

My carnivorous plants –  a pitcher plant, dubbed The Kool-aid Plant, and a Venus fly trap, named Gerald – could do with a home remodel. To keep the humidity up around them, I put an old candy container over the top of the pot I bought for them. It works well at keeping moisture in, but it’s got a few drawbacks.

  1. My carnivorous friends can’t do what they do best since bugs can’t get in without human intervention.
  1. Humans can’t get in either without disturbing the pitcher plants that grow tall and lean against the inside of the container. This makes watering and pruning cumbersome.
  1. It looks terrible.

To solve this, I’m going to design a new home for my bug-munching friends. I have no idea what I want it to look like, but it needs to look good; whatever that means.

But why not just buy one? There’s plenty of cool, move-in-ready solutions for rehousing those plants.

Yes, that is certainly true. I could find something I like and just buy it… But I don’t want to. I want to design my own, so I will. I’m taking advantage of an opportunity to do a small and fairly simple design project while I’m also in the midst of a larger, more complicated design project.

Draft Written: January 9, 2020
Last Updated: February 8, 2020

Project Milestones

End-Use Requirements

A prioritized list of key, high-level features the completed project needs to include. This list drives the design and development of the project and keeps focus on what is important. Referring back to this list at major milestones is important to avoid ending up with a finished project that misses the mark.

Engineering Requirements

The following is a list of engineering specifications and requirements necessary to meet the user requirements outlined. These specifications may be updated and expanded as design and development continue.

Carnivorous Plant Care Research

Image Source: wikipedia; LearjetMinako
Image Source: Wikipedia; NoahElhardt

After some research into Venus flytraps and the pitcher plants I have, I’ve concluded the following from the sources listed at the bottom of this post:

Fly Illustration
Dormant Fly Trap IllustrationFly Trap Illustration
Active Fly Traps
Dormant Fly Traps

Questions? Concerns? Have I missed any important care and feeding notes? Please let me know in the comments section at the bottom of this page.

Sources

Venus flytrapSarraceniaHow to Care for Venus Fly Traps (with Pictures)How to Grow Venus FlytrapHow to Grow Pitcher Plants: 9 Steps (with Pictures)Chic and Simple Carnivorous Plant Terrariums : 10 Steps (with Pictures)
Draft Written: January 9, 2020
Published: March 10, 2020
Last Updated: March 10, 2020

Design Development

Concept Sketching

Back in early January when I opted to do this project, I had very simple concepts in mind. While doodling in my notebook trying to figure out something completely unrelated to this project, a cooler, yet more complicated concept came to me. Click the image below to see the short progression of sketches.

Planter Preliminary Concept Sketches

Fiddling in Fusion 360 CAD

Undercut-free Hinge
Undercut-free Hinge

The parts of this planter will be 3d printed, molded, and then cast, likely using a matrix mold since the parts will be fairly large, and I don’t want to use up a lot of expensive silicone. I started modeling and printing back in January 2020, before I had the engineering requirements worked out. I made some decent progress modeling up the planter in Fusion 360. It wasn't smooth progress, but it was something. I got the head modeled with an undercut-free hinge between the two halves, but I struggled when it came to modeling the mouth. I tried using the form tool first, but I lost patience with it honestly. I also tried making the lips with the loft tool, but I wasn't happy with it. Its mouth ended up looking too friendly. Menacing and eager-to-devour-you is more what I was after. For eons, I've meant to learn Blender for organic modeling. Blender Guru's Donut Tutorial YouTube series is definitely in my "watch later" list.

Not-so-Cool Planter Lips CAD
Not-so-cool Planter Lips Modeled

Unsatisfied with the mouth expression on the planter and my limited understanding of organic control in Fusion, I opted to leave the mouth expression out of the CAD model for now, and instead just left a cut out in the head to sculpt a mouth onto later physically. I'll develop organic computer modeling skills another time.

Facepalm

Immediately after I finished modeling the head, I output .stl files for 3D printing and started printing the bottom half, a 17-hour print. In all my excitement to move forward and get parts printing, I jumped the gun. *Facepalm* Looking at the part in my hands, it was apparent it wasn't deep enough. I could and should have seen that in Fusion BEFORE I printed the part. There are a few obvious things I should have done differently to avoid this:

Shallow Pot
Welp! This was foolish!

I've heard it said when it comes to design and development, iterate quickly and fail fast. I understand that the methodology can be extremely beneficial in product development, but I imagine there are some caveats to that. Fail fast, but fail smart. Avoid silly and costly mistakes. Fast iteration and failing fast is not an excuse for recklessness and half-baked planning and design. I'm still working out the balance between failing quickly and failing intelligently.

3d Printed Yucky Filets
Yucky Filets

The filets on the print didn't turn out very well without support material. I didn't expect them to be perfect, but I thought they'd be better than this. Perhaps I'll try printing with support next time and see if it turns out better. In either case, I can fix the filets in post-processing anyway, so it's not a huge problem.

Next...

I'm not sure if I want the wall thickness of the planter to be 5mm or 3mm. 5mm seems really thick and wasteful, but is 3mm thick enough for a sturdy pot? I won't know until I get some resin and make a couple of test samples at 3mm thick and 5mm thick. Right now, it's modeled at 5mm thick.

I've since completed the engineering requirements of the project and made some changes to the design. It's taller/deeper, and it has built-in ribs to support a smaller pot inside for double-walled potting. I've printed a mini version of the entire head to serve as a maquette so I can play around with sculpting expressions on it. I thought the softened cube shape might grow on me, but I'm still not thrilled with it, so I'll model an oval or egg shape and make another maquette to play with as well. The cube shape could be more of a pain in the molding/demolding process anyway. An egg shape will be easier. My next move on this project is to sculpt maquettes until I come up with something I’m happy with. Afterward, I can return to Fusion 360 for modeling.

Taller Planter w/ Proper Depth
Taller Planter w/ Proper Depth

Sources

Blender Guru's YouTube ChannelBlender Guru's Blender Donut Tutorial
Draft Written: April 7, 2020
Published: June 17, 2020
Last Updated: June 17, 2020
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