Name: Resin Collector
Details: Very simple idea: craft together a treetap and a bucket to get a resin collector (much like the ones used on real-life maple trees in Canada). Right click with one on a resin hole to place it on the hole. There will now be a little treetap coming out of the tree and a bucket below it (probably a very squarish model or even a planar sprite stuck perpendicular to the trunk). The bucket will now hold onto resin as the tree forms it and it comes out the tap; it will slowly fill (one resin per resin hole recharge, as opposed to one to three manually harvesting), having a maximum capacity of probably about 10 resin. Right clicking the bucket will empty it and give you the resin harvested.
Balance: For an increase in capital costs (one bucket and one treetap for each resin hole), harvest costs are eliminated (don't use up treetaps or energy on electric treetaps); for a slight decrease in maximum yield per time (only one resin is produced each time a resin hole reforms, as opposed to the one to three resin one can get from manually harvesting every resin hole as soon as it regnerates), it yields a significant increase in yield per harvest (up to ten (or so) resin per harvest, as opposed to one to three for a regular harvest) provided harvests are spaced far enough apart.
In short, if you tap rubber trees irregularly, you can invest in the buckets required and you won't have to have as many rubber trees to get enough resin at a go. If you regularly tap your rubber trees soon after they recharge, you'll see little to no benefit and could forgo the costs of the buckets.
Recipe: One treetap in the middle and one bucket in the bottom center.