The block signals are O Scale and slightly more than 6" tall. I made measurements on some purchased O Scale block signals and looked a pictures on-line and the UP block signals near where I live. I then made CAD drawings with Tinkercad for the 3D printer. The block signal material cost is less than $1. It takes about 2 hours to print all the parts. I batch print about 8-12 pieces of each part. In a week I can have parts for 30+ block signals. I use a "Silk Silver" PLA plastic for the metal parts and black PLA plastic for the face. The pole is a 4mm diameter white ABS tube. I am debating if it should be spray painted silver. It takes 15-30 min to solder and assemble one of the block signals. I hope to get faster at the assembly. I should be able to do batch assembly in less than 10 min each.
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