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PortCalc

I found this puzzle very disappointing, because of many elements. As you can read in guides about making great maps, you shouldn't in any case let the player guess what's to be done. Aside from a roleplay indication in the description, we don't know precisely what we're supposed to do, and even worse, we are not notified when we just did something right. After reading through all the comments, I'm still not sure about how to get the sphere down, and in fact, I couldn't even get it past the topmost bridge.
But what's most disappointing is that I love highly logical puzzles and simulating calculators in games, and this map, in my opinion, fails with this goal.
Get rid of those four buttons. They're not logical enough. Get the player to directly cut the lasers with the cubes to draw the right digits. Be absolutely logical.

Just taking the companion cube is too simple, but understanding that you need it for the bridges is too hard... What about adding a laser cube instead, so that the player needs to place it at the correct place to repair the mechanism? Not sure if still too hard or not...

Well, there is a dropped bit, that has to be placed on the right spot anyway.
Just taking it from the laser to repair the digit is too simple in my opinion, no? :)

Hmmm... Yeah... All depends on how hard you want it to be to understand the solution ^^

LOL, right. You are just right about that. But ... wouldn't be the puzzle of that size too easy to solve, if there wasn't a "little hidden clue"? What do you think about that? Following our comments make the antline dispensable, anyway. No? ;))

The "take me down" and the "use another one here" points are obvious :p What is not obvious is that you need the other one here before opening the exit door XD

The cube up there cries for help:
"take me down, let me help you, use another one here instead!"
Can't you hear it now? =^-^=

Well the self destructing cube have no other use than showing that you should place a cube here right? So if you remove this cube and the dropper you have some free entities to add a useless object ;)
Anyway you can still simply remove the limit :p

Well, a useless object ... good idea but not really thought of that, even more as I am at the Item limit (again). And I'm now afraid of losing my map, like the "Exchange" lately. Once bitten, twice shy.

Well, now you way it, the cube falling on the button switched off the light bridge in front of the exit... Now the link can seems evident, but when in the map, I didn't get it at all XD
Maybe, link the cube button to some hidden useless object so that the antlines will go close to the light bridges? Not sur if players will get the idea better anyway...