Category Archives: CAD

3D printing a fidget spinner

This video shows the process of 3D printing and assembling a fidget spinner. I have designed the spinner using Autodesk Inventor. The spinner is slightly asymmetric, making it easy and comfortable to start it. I use a ceramic ball bearing in the centre and normal bearings as weights. I always use Cura to slice my parts before 3D printing. To print in different colors, I manually edit the generated G-code file using Notepad++. Cura automaticly puts a comment in the G-code file at the start of each new layer. I use the search function to find a specific layer and insert a couple commands to lower the printbed and pause the machine so I can change the filament.

The STL files for the spinner is available on Thingiverse here.

DIY FPV goggles

When I wanted to get into FPV a couple of moths ago I bought the Eachine EV800 FPV goggles with built in VTX and battery. I liked the idea that they could be used as goggles, and also as a screen. However, when that arrived I realised that they were very uncomfortable to wear, and I was not able to wear my normal glasses under them as I had intended. Therefore I only used the screen to start with.

I was not completely happy with the screen experience, I still wanted to have googles. Therefore I started to design my own goggle-part. I started with making a four part assembly in SketchUp to snap into the existing mount on the EV800, and also to hold the fresnel-lense in place. I 3D printed the parts, glued them together, and they fit perfectly. Since the shape of the rest of the goggles is very complicated, I thought it would be very time-consuming to design and 3D print everything. Therefore I built the rest of the goggles using cardboard, paper and hot glue. To make it look better and be more comfortable to wear I covered the entire thing in fabric, using more hot glue. I kept the part touching the face as large as possible to make them fit over my glasses. I finished off the design with some 3D printed parts to mount the original head strap from the EV800. I am pretty satisfied with the result. Now the goggles are comfortable, fits over my glasses, and is comfortable to wear. And I can still remove the screen from the goggles is I want.

All STL files for 3D printing are available for download here: DIY_FPV_goggles.zip

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3D printed quadcopter and hexacopter avalible for download

I have continued to work on my 3D printed quadcopter. Now I have also created a new baseplate for a hexacopter. It is still using the same wooden arms, motor mounts and landing gears. I have also created a few extra pieces that I needed, mostly mounts for different antennas.

I will probably add more pieces in the future. Please comment if you have any ideas for what I should add or change.

Click the link below to download the STL files for all the pieces I have made so far.

Download modular 3D printed quadcopter/hexacopter

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3D printed quadcopter

This is a 3D printed quadcopter that I have made. The design is not entirely 3D printed, it uses 15×15 mm wooden spars as motor booms. My idea was to create a modular system to build quadcopters (and maybe other multirotors) using 3D printed parts. I want multicopters that are fast and easy to assemble, modify and upgrade. I also want them to be cheep in material cost, therefore I have tried to keep the weight as low as possible. Right now, one quadcopter frame is slightly below 100grams of plastic.

Right now I have 3D printed motor mounts, landing gears and a center piece as well as a top plate for mounting the battery and all the necessary spacers. The size of the quadcopter is determined by the length of the wood pieces. The quad in the images is a 250 size. I am using wood instead of 3D printed arms it to keep the weight down, I also think it is stronger.

I will continue to experiment with this 3D printed multirotor building system, and hopefully make all the STL-files available for download in the future.

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A small indoor plane with plans

This is a small indoor airplane designed to be very durable, easy to fly and fast to build. It is based on an old model called “Tichy Stick” by J.A Benson. The original model is designed for a Cox .010 engine and meant to be built out of balsa. My version is built out of 3 mm depron (foam). I have moved the motor back and turned it around to create a pusher. This makes it very durable. I have also created a open battery tray on the top front of the fuselage for easy access. The plane is designed for a 5-7 gram outrunner with a 5 inch propeller and a 2 cell 300-500 mAh battery. The wingspan is 620 mm and the flying weight should be around 60-80 grams. I have not yet tested this design but I am pretty sure it will fly great. I have tested a depron version of the original “Tichy Stick” which flies good.

Plans: stikPusher.pdf   (1.8kB)

3D model make with “SketchUp Make”: stikPusher3Dmodel.skp   (1.4MB)

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A collection of parts to use in SketchUp

When I want to make something I usually start drawing in SketchUp. Often the things I draw never becomes reality for different reasons, but some do. I have tried more advanced CAD programs like AutoCAD or Inventor, but i always falls back to SketchUp. It is a great tool for creating fast prototypes and testing ideas. SketchUp is special compared to other programs in the way that it only has a very limited set of tools. This makes it fast and easy to learn and work with. This also makes it hard to do some complex parts, but usualy, it is not a problem.There is also an “3D warehouse” where users can upload models. It is also possible to download other’s models into your own model. This is great when you want to add some common part to your project, like an Arduino for example. Why draw it again when others have already done it?

When I make my 3D models I save all general parts i think that I will have a use for in the future in a separate file to make them easy to copy. This file contains robotics parts, electronics parts, displays, motors, and some multirotor and Airplane stuff. Most of the things I have made myself but some I have downloaded from the “3D warehouse” and modified in some way.

The file is available for download here: SketchUpParts.zip (8MB)

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