ExtruH Pen Plotter

This is an updated version of my ExtruDraw plotter. If you have already built an ExtruDraw some of the hardware is compatible but there isn't a huge difference between them so you may not find this a big upgrade and it might not be worth changing your plotter over to this design.

The main difference between the two is that where the Extrudraw has its belts in a cross shape this plotter has H-shaped belts. This has the advantage that the plotter can work fully inside its own footprint with no parts overhanging outside of the plotting area. For the same reason the pen height can be more stable since the pen arm is supported at both ends with less risk of drooping from the weight of the pen arm.

However, despite these differences the plotter is close enough to the AxiDraw that software or hardware intended to drive an AxiDraw should also be able to drive this plotter with some minor code reconfiguration (see later for details).

The whole plotter is designed in OpenSCAD, the code