(Okay I'm gonna respond to all the comments at once since this website just is like that)
> Is there any funnel or depot I can use to store the empty bucket?
The engine *should* just cycle the empty bucket from the depot > funnel > depot infinitely. This shouldn't impact the effectiveness of the engine, since the mechanical arm doesn't consume more SU when it's in motion. Be sure to not put more than 1 bucket in the machine (2 might also be fine, not sure), it might lock it up. If anyone keeps experiencing the issue, let me know on Discord, my username is MagicJinn, I'd love to diagnose the problem. Personally, I've run the engine for hours and it never failed on me.
> Very good. Works perfect! Sorry for the wrong Rating
Good to hear! No clue how to change ratings (if possible) but don't worry about it.
> The best way I've found to solve the issue with the empty bucket is to add a second mechanical arm and depot, except once all the blazes are fed they just rotate the lava bucket around indefinitely
A moving mechanical arm *shouldn't* use more SU, so it's not really an issue to keep an empty bucket in the system. Adding a second arm is definitely an option, but it makes the farm more expensive. I tried to keep it as cheap as possible.