[GreenKeys] 33 LF upstop replacement

[Hugh Pyle]

The line-feed function on one of my Model 33s broke, due to a deteriorated
plastic "up-stop".  I don't have a good picture of the original part or the
shards that it turned into, but modeled a replacement just by approximate
measurement, and it seems to work well.  (This is a late-model unit, the
early-model LF mechanism is very different).

This is my first time printing with "Ninjaflex" (TPU).  It's slightly
flexible polyurethane.  The print came out a little bit ragged, but I think
it'll be strong enough to handle the work.  This part is much larger than
the 28LPR hammer (0.6 x 0.25 x 0.4 in), so the fine detail isn't critical.

A couple pictures:
<https://twitter.com/33asr/status/1217597970729832449>
https://twitter.com/33asr/status/1217597970729832449
https://twitter.com/33asr/status/1217628061530775554

3D model:
https://github.com/hughpyle/ASR33/blob/master/hardware/TeletypeModel33_LFUpstop.stl


-Hugh
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