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Jan 1st, 2024
FarmBot Tool - 3D Printed Wrench for Eccentric Nuts
By:
Noah Greskiewicz
Fluxspace
🎓 Grade Level —
4+
⌛ Time to Read —
3 min
📥 Includes —
Overview, STL File
Materials
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FarmBot Tool - 3D Printed Wrench for Eccentric Nuts

AI Summary:

At Fluxspace, the development of the FarmBot—a CNC garden bed automating planting, watering, and weeding—highlighted a tooling challenge involving the adjustment of eccentric nuts in inaccessible locations. The existing wrench lacked the necessary reach and bend, prompting the design and 3D printing of a custom 8mm box wrench with a ninety-degree angle. Initial prints failed due to layer orientation weaknesses inherent in fused deposition modeling, causing premature breakage. By strategically reorienting the print layers, a durable tool was produced that successfully met functional requirements, demonstrating the critical influence of print parameters on mechanical performance in additive manufacturing.

Overview

Recently, at Fluxspace, we have been building and testing a new product: enter the FarmBot. The FarmBot is a CNC garden bed that uses technology from 3D printers to water, plant, and remove weeds, all from a laptop.

While building the FarmBot, we had to adjust eccentric nuts in difficult-to-reach places; unfortunately, the wrench we had wouldn’t reach. While adapting a tool we had on hand might work, I thought this was the perfect opportunity to utilize our 3D printers.

Our problem:

The tool we needed to replace was an 8mm box wrench. To achieve a proper tool and nut interface, the wrench needs a ninety-degree bend. After gathering the necessary measurements, I designed and printed the part. I was excited to see that it fit perfectly. However, as I turned the second nut, my tool snapped.

When 3D printing, many aspects contribute to making a durable product. One aspect that I failed to account for was the direction of the printed layers. In many cases, layers are the point of failure in 3D prints. To resolve this issue, I reoriented the model in my 3D printing software to change the direction of the layers. Here are my two versions:

Successful vs. failed tool:

The finished product does exactly what it needs to and allows us to properly adjust the eccentric nuts on the FarmBot!

Project Examples

Have a solution to this challenge you want to share? Take a photo or video of your prototype, post it on social media, and don’t forget to tag us @fluxspace_io

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