Spoon's Stash is the most versatile pick, overall you want to keep your passives in the backpack and actives in main slots. There are far too many great choices to buy for Spoon's, And I usually like to combine my guides into all in one, but because the list gets so chunky here Spoon gets his own dedicated guide :D.

Backpack enables hoarding of neutrals so they become some of the most broken options. A lot of choices will be playstyle and game specific but I'm going to do my level best to provide a good and detailed set of options for this one facet of techies... Enjoy!

Notes:

My personal favourite way to start is 2 Tango and the rest on Iron Branches, but I also like to have a preference to carrying Quelling for the extra damage vs creeps and utility of cutting trees because it helps with jukes and tricky mine placements, also I love buying wraith band(s) for the attack speed, all of the stats add up great with Techies being a Universal hero, and you will see me mix up a lot of stat items and attack speed and things that build well to the level 25 damage tallent.

With this in mind Techies can truely benefit from all the stats and you can play him in most roles, probablly going to want to avoid carry though lol.

Blast off combos; Whilst theres a good too many ways to build around blast off, I included a few of my personal favourites, generally you would like to initiate with Gleipnir to hold em, silence and e-blade the one you want to get the most damaged, and pound on their faces, you can bring escape options if you like but it's supposed to be an aggressive play imo, can be played defensively too so keep your whit.

E-Blade also pairs well with Revenant Brooch.

Ultra late:

Typically, Techies can gain some serious gold through flash farming and waves on push or defense solo, a lot of the bigger items are reletively useful, whilst I prefer to be a nice and aggressive damage dealer I also often find I tilt the oponent into focusing me so Heart and Satanic become great options later, but don't be afraid to pick crazy looking options, the only thing I don't reccomend is rapier but who knows, maybe you can be the first to pack 9 of the suckers!

Personal Favourites:

So I usually prefer Sqee's Scope builds, I like to leverage the extra attack range on Techies anyway, So I have a bias towards Orchid>Butterfly>Skadi for a good attack speed, pile of stats and the slow and anti hp-regen properties, they all set up your self and your team incredibly well so keep it in mind when you can, it's also a great way to save your mines from creeps walking into them or your team being dumb and leading creeps towards them, happens way too much imo.

3 Mines and a Sign:

Easy trap, place your sign (with aghs) at the top of some stairs, 2 mines either side of the top of the stairs and 1 more in a triangle as close as possible, bait them in or just wait for them to walk up for an ez kill and a load of laughs.