I'm usually quite comfortable with production cabinets, and would easily construct any common product in these large cells, but this is not a common product, you had the gall to ask an alchemist to make a fiber with this thing!

It is important to remember that repeating products need a bit of space to bend under the engine's assembly chamber, enforcing a large amount of space unusable. The chambers employed require you to pivot the product into the output, sweeping across yet more precious area that must be clear of arms, for else they will bonk.

To minimize cost, a single bonder is tasked with assembling a long and short stick, then used again to assemble the sticks into the first polymer section then pivoted to be fed out of the machine.

TL;DR: This was difficult.

-Alchemist Harold Green.