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Hi,Thanks for the compliment, glad you like it.As for the Z axis taking forever to home, you can set the homing speed separately so that it would print normally and home quicker.I know the site you linked, but I don't trust generic settings. I found that if you do it by hand and calculate everything you'll get slightly different values and better fit for your setup. Setting calculators are good for quick basic calibration, but if you want to get to 0.005mm, there's not escape from manual calibration.It's not a hassle either, it takes a couple of minutes.
Thanks! glad you liked it!The coil does not have to be perfectly round, but that might affect its efficiency.In fact, in many other applications that use this technology (i.e. RFID, NFC etc.) the coil is rectangular. i guess you can shape it as you wish as long as it's looped around.You might want to do some experiments and see how this affects the energy transfer.regarding the position, it works within a small tolerance of movement. this is why these chargers have magnets to align the phone.I saw some commercial chargers that use 3 coils instead of one to allow for more flexibility in positioning the phone on the charger. maybe a bigger coil would help too, I'm not sure.
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