hey guys I have for some time wound my own air core inductors using this online app.
Pronine Electronics Design - Multilayer Air Core Inductor Calculator
its quite accurate and useful unless you want to use wire finer than 45AWG
for BIG current I like 18AWG and was happy to find this wire on Ebay
18 AWG Gauge Enameled Copper Magnet Wire 200C 5lb 995ft Magnetic Coil Winding | eBay
<$0.06 / ft They have 45 units to sell and its pretty cheap
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