Blocks with grooves
| Turns out, the factory in Ukraine makes pre-assembled blocks of wls scintillator, with grooves for the wls fibers. We received 3 blocks, 21 cm long, consisting of 18 5×5mm scintillator bars, with 1.5 mm grooves milled i. Our blocks eed to be 16 wide, but it was easy to split off 2 bars | 
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| If we cut the blocks (block 1 14 and 7 cm, block 2 9,9,3 cm, and block 3 11,6,4 cm we can make a 32 cm long, 2-layer test assembly. |
3 6 9 14
4 7 9 11
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| The yellow block has 16 3cm bars, with the grooves on top. The grey coupler is glued to the scintillator block, and the wls fibers continue to the grey-red interface, and are gued in the grey coupler ad polished. The red block holds the 0.5 mm fibers, and is attached to the grey coupler with 4 M2 screws. The M2 nuts drop in the rectangular holes. | 
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| The conectors drop 4.5mm below the scintillator blocks, and another 3mm is needed for the output ribbons. | 
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| To minimize mass of the supporting tray, the space can be made of honeycomb | 
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