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Upright condenser needs updating to use new LED mount

Since merging !257 (merged), the upright condenser uses the new board-based condenser rather than the old one fitted for a 5mm LED. However, the bottom half still assumes a 5mm LED. This means the only way to make it work is to add some tape to the LED (which should be recommended anyway, because it helps diffuse the light) so that it stays in the now-slightly-too-big hole.

It's not totally broken, but it's slightly worse than it was. It would be very nice to update it to match the new condenser for the inverted microscope. This would involve:

  • Make the Z position parametric, closing #227 (closed)
  • Split the upright condenser into two parts - a part similar to the inverted condenser (but without the mounting) and an "lid" that includes the objective mounting wedge to connect to the Z axis.
  • Add in the holes to the "lid" to allow the existing 5mm LED holder to fit there
  • Increase the size of the void under the condenser (i.e. at the top of the lid) to allow use of the illumination PCB
  • Add a lug to the condenser that enables the existing mounting screws to be used, possibly in the opposite direction (i.e. screwing through clearance holes in the condenser, into tapped holes in the lid/mounting.

This would be a nice self-contained project, but probably shouldn't hold up release. If we decide to unify the dovetails in a future release (i.e. use the same fitting for the condenser and the objective) this will become obsolete, so we should think carefully before sinking too much time into it.