Trumpet Valve Guide
myminifactory
These custom trumpet valve guides were designed specifically for vintage King trumpets, but they also fit many other models from Bach and Conn. Based on my observations, it appears to be most similar in design to the model 180 valve guide. For long-term reliability, I would highly recommend using either PETG or Nylon, however, I've been successfully using a PLA printed one for over a year now with no problems at all.
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