We wanted to have a small machine dedicated to Flexible print manufacture. Languishing in a corner was an A3 which was actually the first machine we bought. Titan Aero by E3D was always going to be the extruder of choice for this application.
I wanted to minimize the loss of print area, but also I wanted to make sure that the extruder didn't poke out the top of the printer as at some point I will also be putting acrylic windows on it so that we can consider more exotic materials.
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No existing designs fitted the bill so this is what we came up with. It has now been operational for many months with no issues.