Live: Trying out some “intelligent” 3D printing pens!

My first contact with “3D printing pens” – how much should I expect for $35? Also, let’s have my little sister try them out – maybe she’ll be a better audience than me?

Get the pens from Gearbest:
🛒 F20 (with LCD)
🛒 Sunlu SL-400 (no LCD)