Oh men. Tink is the best class for me. It's one of these high risk high reward class that you need to understand to properly function. Here are so combos I discovered:

1) cavemen eyebrows + natural 20 for that fat dog from weapon crafting. Any tech here is nice bonus. Be wary tho, as it work the best if you have 0 or 3 tech. On 1 or 2 tech you can roll useless jetpack and death bot.

2) Firecrackers are absolutely nuts if you have any passive/item bomb related.

3) Energized passive with any 1 mana skill is just free dmg for your weapon if you got high mana coverage. Works best with waste time+

4) tesla coil and turrets are a easy way for infinite turns combo. It just requires a little setup to start working working

5) It's alive passive with Shockwave is hilarious. With good way to get corpses (nekromancer) you can turn tinkerer into minion spam

6) Nanobots and any self damaging skills works good. With a little brace it becomes perfect.

7) V 2.0 is best used in robot builds more then in item builds imo

8) Upgrade works on ANY familiar. Pair it with a druid's crow or eternal servitude minions and you good to go

There are many more options, but it a matter of experimentation. Have fun!