[GreenKeys] UGC-136 ribbon update

[Nick England]

 John brought over the revised version for testing today - it looks great!
https://www.navy-radio.com/tty/ugc136/ribbon.htm#print

He is going to do a little minor editing on the model and then we will get
the test SLS print from Xometry and make sure it works OK before placing a
quantity order. Be patient - we do need to test the SLS printed version to
make sure there are no issues.

Today we used an open end ribbon for the test. However, John made a little
modification to the design so that we can install a continuous loop - no
need to splice/fuse the ends after installation.
Stay tuned - we still need to identify a ribbon source. I investigated a
couple of cheap and available cartridges for other machines, but they have
a half-twist in their loops which seems like a good idea because then you
print on both sides (Mobius strip). But there is no room in the UGC-136
cartridge to put that half-twist - how odd that they didn't do that.

I made an offer to buy all 30 that the German eBay guy has left - but he
still wanted too much. So they are still available if you just can't wait.
https://www.ebay.com/itm/224506008457

Nick England K4NYW
www.navy-radio.com
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