One of the biggest problems with building your own DIY equipment is the space that it takes up. If you happen to live in a small space and don't have a workshop to keep your kit in, it can very quickly become overwhelming.
A descent roto-moulding (or roto-casting depending on your terminology) machine is quite a bulky thing.  Add to that the limited space that you have as a student (or freelance product designer) and you have a dilemma - you would like the equipment, but need it to be stored in as small a space as possible.

The solution to all of these problems comes with K'NEX.  This child's construction toy is lightweight, strong, reasonably cheap and best of all completely adaptable for different purposes.  These instructions will show you how to build a fully functional machine with a big enough space for descent models and projects.
This is prefect for small plastic casting, but also for more 'family friendly' projects such as Easter egg making (more on that later)...


Step 1: Counter-balance (x1)

To begin with you need to construct the inside frame for the roto-moulder.
This can be done using normal purple connectors and white sticks. You also need to add some wheels to this part to add ballast.

You could use this thing for training minature astronauts.
Am I missing something? How do you melt the plastic?
This is great. I love when people make cool & practical things (ie NOT guns or ball machines) with K'nex. And these schematics are amazing! What did you use?
Thanks! Mainly Photoshop to just clean up the images.. There are a few K'Nex CAD programs out there, but they generally can't hand the complexity that this machine has.
congratulations on making the first k'nex project in a long time that might actually be featured. this thing is pretty cool.

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More by HRhV:Easter egg moulding! How to make a solitaire engagement ring K'Nex Roto-moulding machine 
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