Hygrometer for Filament Dryer (Sunlu S1 + eSun eBox) - no drilling

Description

I liked the design for a hygrometer holder by [Grzegorz Buszewicz](https://www.thingiverse.com/thing:4650052), but it never worked out well for me. Just mounting it on the little filament hole was never stable enough and the thin tube (only ~5mm thick with >2mm hole for filament) broke frequently, with the little nut pulling the layers of the screw apart). Additionally I didn't like the "barrel" forcing upward or downward direction and the additional friction on the filament due to the thin hole was also not really an improvement. Therefore I created my own designs which are mounted on the inside of the base and just leave the hole open and untouched. It consists of two parts now, a base plate mounted to the inside front side of the dryer and a holder for the humidity gauge, which __can easily be inserted or removed even if filament is already loaded and printing__. The result is stable, doesn't shake, nor break easily. And depending on the hygrometer you prefer, I created versions for the rectangular ones and for the round versions which are very cheap and available in many shops (e.g. [here](https://www.amazon.de/Vaikby-raumthermometer-zimmerthermometer-luftfeuchtigkeitsmesser-Gew%C3%A4chshausautos/dp/B09WDVSLZ4/?content-id=amzn1.sym.0bf9ab1e-db90-4058-8c91-2e3e5b4712b7), but many other sources) The Sunlu mount plate is fixed using the screws of the heating metal (added a strip of Kapton tape for some (minimal) heat isolation (although PET(G) should work well without). The eSun dryer (eBox) doesn't have any screws, but a thin slit which can be used to insert a "blade". The gauge holders are tilted some degrees to allow easy opening of the cover. And the arm to stick it on the mount plate as a gap at the bottom which is wide enough for the filament to pass through. This way the humidity gauge can be attached or removed any time, also during a print. This is especially useful for the eBox version, because due to the limited space under the round cover, completely full spools might not allow to attach the gauge immediately. ---- Update 2022-09-16: After having the humidity gauge used for some time also on the maximum temperature of the SunluS1 (which i also use to dry my silica bags - a lot more energy efficient than in the oven in the kitchen), I realized that at the high temperature even PETG mounted directly on the heating metal gets a bit soft. The holder is still working fine, but the front plate is bent a bit at the bottom and no longer standing perfectly upright. Therefore I added some small stabilizers on the side and put on a second layer of Kapton tape. So if you plan to use max. heat, try the version 2 for Sunlu S1.

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