If you ever used air filters to keep smells, fumes and dust at a low level in your workshop, you for sure came in contact with these expensive throwaway active coal filters. While throwing-away the used active coal seems to be unavoidable, all the thrown away plastic and packaging of the filter can easily be…
Extreme Integers – Doom from Below
As a beginner or immediate C++ programmer, you heard never mixing unsigned and signed integer types or avoiding unsigned integers at all. There was also this talk about undefined behaviour. Yet, in embedded software development, there is no way around unsigned integers – so what is behind all these warnings? Wonderful that you strive to…
How to Create a Large 3D Printed Artwork
I recently built a relatively large (100cm × 80cm) 3D printed artwork, which features a painted relief of mathematical functions. Read how I prepared the data, converted it into 3D printable tiles and converted them into printable gcode. All the images and previews are from the proof of concept I created. The final artwork is…
Huge Storage Boxes Update
Today I release a huge update of my storage boxes system for 3d-print. This update not only further improves the geometries of the models, but also extend the available sizes and variants. There are now 1000+ model files in the full set you can buy in the shop. As a buyer of one of the…
Round Corner Template Set for Woodworking
Sometimes I like to have rounded corners in my woodworking projects. It seems many people like to soften the spiky ends of their panels because there is a huge range of templates for routing. If you own a 3d printer, it is handy you can print just the template with the size you actually need….
Adafruit PowerBoost 1000C Enclosure (LR2165)
I made a simple 3d printed enclosure for Adafruit’s PowerBoost 1000C and a 1200mAh or smaller LiPo battery. This post contains all the files you need for the print, a list of components, and assembly instructions. My design uses three simple parts with tight tolerances. They are held together with two M3 screws and two…
Storage Boxes System Survey
Please take the following survey to help with further development of the storage boxes system. It is the best way to nudge future changes of the system into the direction you like. 😄 More Posts
New Storage Boxes
Today I published several new storage boxes with the label section placed at a different side. So, it will allow you to use the same box size in a drawer but keep all label orientations the same. The following two illustrations show the difference between the 1✕2 and 2✕1 size: Both boxes have exactly the…
Build and Heat Treatment of a Carbohydrate Source
In this short tutorial, I will explain step by step, how you can build a solid carbohydrate source. You will find the bill of materials and all required tools. I will use SI units to simplify all measurements. This is no quick build, the substances require long reaction and activation times. For this reason, the…
Logic Gates Puzzle 100
Assume, while digging out an ancient site from 450 AD, you found a mysterious stone with a digital display. Your analysis finds five inputs for five segments (a–e) and six outputs (1–6). It seems to be a classic multiplexed display. What is this display for? What is the highest continuous sequence of numbers it can…