Stop overpaying for dryboxes. This is an ultra-cheap, high-efficiency upgrade for standard 4L cereal containers. The main advantage: Zero mechanical work. You don't need to drill, saw, or melt holes into the plastic. The parts are designed to be plug-and-play.

Budget Friendly: Total cost per box is under 8 €.

Clean & Easy: Just two printed parts, no supports needed.

Non-Destructive: No drilling or sawing required – prevents cracking the container.

Integrated Monitoring: Features a dedicated slot for a digital hygrometer.

Open Source: Feel free to remix and adapt this project!

Required Hardware (Non-Printed)
Cereal Box (4L):
https://www.amazon.de/dp/B08JTH2NZJ?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_2&th=1

Hygrometer: Mini Digital LCD Thermometer/Hygrometer
https://de.aliexpress.com/item/1005008141527394.html?spm=a2g0o.productlist.main.2.19e840c7tdbZsl&algo_pvid=2bb4438c-8195-4195-a44f-ee84d4433528&algo_exp_id=2bb4438c-8195-4195-a44f-ee84d4433528-1&pdp_ext_f=%7B%22order%22%3A%222613%22%2C%22eval%22%3A%221%22%2C%22fromPage%22%3A%22search%22%7D&pdp_npi=6%40dis%21EUR%212.08%210.99%21%21%2116.47%217.84%21%40211b65de17717860946007027ed941%2112000052034520588%21sea%21DE%210%21ABX%211%210%21n_tag%3A-29910%3Bd%3Af4390400%3Bm03_new_user%3A-29895%3BpisId%3A5000000197696397&curPageLogUid=kTkX1PyMF6yp&utparam-url=scene%3Asearch%7Cquery_from%3A%7Cx_object_id%3A1005008141527394%7C_p_origin_prod%3A

Pneumatic Fittings: 2x PC4-M6
https://www.amazon.de/AEDIKO-Pneumatic-Fittings-Straight-Connector/dp/B0D2KZXBX1/ref=sr_1_6?dib=eyJ2IjoiMSJ9.VZCBubty317STstyAPQWFvkm2OYMjw9Zr98yyO65nVc_D1d7r8kVHISk7GVdh5vbVOtfnfGy3nw7Xg2X_icx_LXGfxcMsVqoUshgSpduuB7OP4V868Y-dTe9gKgGDN92hXFfAGbXpQPWPQhKLIFV0-TeVjDZG84BJlQmsk_6qdngmrhEIjmplgbGxd7X60Zt43TaH3x__moFLqWYssPhKkLfWfc1e1-WcSzvmlPR8zypYpAU6RlamRZRxPg8gqX6SLdME8cogt8FfOKUz57R2HvGCxUYLB3L9_3gUSqL2Ag.cV5D6qu5Q_JuyP9h3RDyp1MPFK5_3nBzb82QCX1iZE8&dib_tag=se&keywords=PC4-M6&qid=1771785070&sr=8-6

PTFE Tube: A short piece to connect to your printer.

Desiccant: Silica gel beads for the bottom.

Assembly Instructions
Print the two components.
Screw the PC4-M6 fittings directly into the printed threads.
Snap the Mini Hygrometer into the designated slot.
Insert the printed assembly into the box/lid opening.
Fill with silica gel, add your spool, connect the tube – done!

Filament Drybox Zero-Drill – Budget Muesli Box Conversion

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