There are many Qi chargers available on eBay for about $6 to $10 that are 70mm in diameter, and 10mm thick. This stand is for those chargers. Others with similar dimensions should obviously work also.
I really liked the looks of the charger stand by Eedh https://www.thingiverse.com/thing:1033675 , but his design puts the Qi charger way too low to carge the iPhone 8 Plus. So, I made this one, with a similar look, but with the Qi charger considerably higher.
My iPhone 8 Plus is about 160mm long. So, this stand attempts to place the Qi charger center about 80mm from where the phone rests. Your phone may vary by +-5mm depending on the protective case you have on your phone.
It's also designed to support thicker cases like Otter Boxes.
it holds the phone at 20 degrees from vertical.
I printed mine with 100% infill to improve stability due to the extra weight. You don't need to though. I just like wasting filament.
UPDATE: Version 2 has analog sound amplification, easier access to the home button, and clearance for the Earbuds Connector so you can use your Lightning Connector Earbuds while the phone is on the stand.