I use the Nicot queen rearing system to raise queen bees for my apiary. As anyone who uses this kit knows, the cassette holds 110 cups, but they only give you 10 or 20 bar holders and cup holders for adding the cups to the builder colonies. I ordered the cup holders from Brushy Mountain, but everyone was out of stock on the bar holders. Luckily, I have a 3D printer.
This is the bar holder only. That's the piece that is usually brown in color and nails or screws to the wooden frame to hold the cell holders in place (friction fit) while the bees do their work. I printed in yellow ABS, mainly because it was already in the machine, but PLA should work as well.
I have uploaded the cell cup holders as well in a separate "Thing".