Filament Splicing Fixture

This is a fixture to hold the ends of filament together in alignment when splicing. It is currently designed for 2.85mm filament, but is parameterized, so it could easily be modified for other diameters.
The channel that hold the filament is curved to match the curve of the filament as it comes off the reel. One side is curved at a smaller radius to match the curve of filament at the end of the reel, the other has a larger radius to match the start of a new reel.
I built this when I started a print and did not have enough filament to finish the object. Rather than abort, I used a soldering iron to melt the ends of the filament together. Hand holding the filament lead to misaligned filament, and the joint breaking when I tried to trim the excess plastic off the joint. I eventually succeeded, but I built this so I could get this right on the first attempt.

How to use:
One side has a set screw that can be adjusted to keep the filament from sliding when the lid is clamped closed, the