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DesignSpark Mechanical used (still too far down the learning curve to risk FreeCAD). Knocked some holes in the side of the model to speed printing – done in silver PLA from Prusa, which is OK for low-temperature experiments. The holes collided part-way through the walls – hence the ugly crack-like feature running around the inside.
And with it raining outside this weekend, it might actually tested before Monday – dying to see if it focusses properly.
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