WriteHand Design

I have recently been spending a lot of time designing the chassis for my 2D drawing robot. I’m designing as I go, which is not recommended by most, but I’m comfortable with it. I import or design in parts I have bought (such as the linear rods) and can figure out what additional hardware I will need for the build.

I’m creating the entire design in Autodesk’s Fusion 360, a free-to-use 3D CAD development tool as long as you are a hobbyist/startup making less than $100K per year (that’s me!). I wanted to use the project to learn the program and perhaps create some tutorials down the road for the project. It has its fair share of bugs and some design features that are below par*, but as a whole I’ve found it useful and looks to be quite powerful, though I haven’t dug in too much into it’s full capabilities.

I’m currently adding some hardware features (Screw and nut locations) and opening holes for rods and screws so that I can make some initial prints. I did not optimize the design for simplicity, but rather added different features for function, and left some geometries somewhat complicated since I’m 3D printing them (angles in the base rather than box shapes). I haven;t yet designed the ends of the Y axis which will hold the pen, but the design should be pretty simple.

*More on “design features that are below par”:

One of the design features that it doesn’t look like Autodesk is in any rush to fix is that when you have an active component next to a non-active component, you can make cuts to the active component that, if your not careful, will also cut any other non-active component you can see. This is a pain for making changes to parts, as to do it successfully, you have to manually hide any other part that would be affected (I see no “isolate” feature). Bad design flaw, in my opinion.

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