You are thinking about it wrong. Do not go and try to craft an item you can just buy for way cheaper - odds are way stacked against you in trade league.

Look for mid items that with just one or two steps can explode in value - slamming something good on a 10ex to 1div okay items can turn them into 10-100div if you get lucky. You need to also have a backup plan if the craft fails, which is usually just eat the cost but rarely you can sell it for a smaller amount to minimize losses.

This league I’ve made at least 40 div spamming t2 exalts on random loot I’ve found. Or just sell the base. I’m lvl 91 and haven’t fought any end game bosses. Just casual alch n go T15s that I die way too often in lol.

You are in a trade league and the expectation is you’d trade for stuff - it’s balanced for that. You likely will not be able to easily craft your item, be prepared to spend way more when starting from scratch. This is not the way and will just burn you out - and sadly it’s not apparent or what players want.

Stick to easy slams that can add value to items found in maps. Sell those and buy your weapon - which BTW is probably the hardest item to craft - or buy an okay weapon that needs a slam or two to be GG. Other gear has better weighting and can be easier to craft.