tender for supply of stores for 20 x 3d printed fd def using 3d concrete printer technology (in-situ printing using locally available materials) - supply of 3d printed reinforced concrete panels along with steel lintels for openings above loopholes, door and outer protection boxes as specified in drgs and specifications steel roofing trough (srt) of size 1500 613 180mm made out of 2mm thick hot rolled carbon steel confirming of is 5986 ee 330 complete with set of 14 nos ms hexagonal nuts. bolts and washers 12 mm dia 40mm long and a spanner ojde of size 20-22 per 10 nos of srt. steel roofing trough (srt) of size 1100 613 180mm made out of 2mm thick hot rolled carbon steel confirming of is 5986 ee 330 complete with set of 14 nos ms hexagonal nuts. bolts and washers 12 mm dia 40mm long and a spanner ojde of size 20-22 per 10 nos of srt. ismc 75 40 mm conforming to is 808-1973, 3.5m long