Printed well, everything fits together nicely. I used acrylic sheets from Amazon, and glue, for the windows. I love having the windows to see how much filament is left. Two small issues. 1. Screeching noise from it when pulling filament. It appears that when the filament is coming from the edge of the spool furthest from the funnel, it rubs too much and screeches. I replaced the funnel with a 1 inch length of PFTE tube. It stays in the hole well, and I no longer hear a noise. Its also easy to load this way, since the PTFE tube can be removed, it can be pushed back up into the hole with filament in it. 2. The S unlu PLA+ 2.0 spools I have do make some noise when the covers are off and I'm loading/uploading filament. They are scraping somewhere. I'm not sure if this contributes to the screeching noise because with the covers on and the PTFE tube in place of the funnel, its quiet while printing.

Fit nicely, provided good view using my Tapo camera

Exactly what I needed for my Amazon bought hygrometers.