If you already know you need a Bluetooth hygrometer for filament storage, this is mostly a placement and visibility decision. Buy the ThermoPro TP357 if you want the stronger fit for sealed totes, cabinets, and storage spots you cannot check at a glance very often. Buy the ThermoPro TP351 if you want the cheaper app-connected check for dry boxes and storage bins before humidity drift turns into stringing, popping, or rougher surface finish.
Availability note: The Amazon listings previously used for the TP357 and TP351 no longer serve those exact models. The current Amazon route points to the exact Govee Mini H5074, a close low-cost Bluetooth alternative for the same filament-storage job.
Quick comparison summary
- Choose TP357 if the real job is monitoring sealed storage that is easy to ignore until moisture damage has already started.
- Choose TP351 if the real job is adding low-cost Bluetooth humidity tracking to a tote, dry box, or cabinet without overthinking it.
- Both make sense for filament storage, but the TP357 sits in the slightly more deliberate monitoring lane while the TP351 is the easier budget pick.
Who each one is for
The TP357 is the better fit for makers who keep filament in closed cabinets, sealed totes, closets, or bench-side containers that do not get checked visually all day. In the product bank, it already sits in the stronger "closed storage you cannot check at a glance" lane, which makes it the better comparison-side pick when the risk is forgetting that a storage space has drifted humid.
The TP351 is the better fit for price-sensitive storage monitoring. It is the cleaner answer when you want a practical Bluetooth sensor for a dry box or tote and you mainly need to stop guessing before prints go bad.
Where the TP357 wins
- Better fit for cabinets, totes, and enclosed storage you do not visually check often.
- Stronger choice when the problem is long stretches of ignored humidity drift rather than quick spot checks.
- Better lane for PETG, TPU, nylon, and other storage-sensitive materials when you want fewer blind spots.
Where the TP351 wins
- Cheaper path into app-connected humidity tracking for filament storage.
- Better fit for budget-minded makers who want dry-box or tote coverage without paying for a more premium-feeling option.
- Easier recommendation when you want to add monitoring to multiple containers instead of making one sensor feel precious.
What is actually different in a filament workflow
Neither of these tools dries filament. They help you catch the storage problem earlier. That matters because wet filament often gets blamed on printers, profiles, or nozzles long before someone checks whether the tote or cabinet has drifted humid. The TP357 makes more sense when the storage space is easy to neglect. The TP351 makes more sense when you simply need a cheap Bluetooth reality check.
Which one should most GoodPrints readers buy?
For most GoodPrints readers, the ThermoPro TP351 is the better value if you are building out multiple dry boxes or sealed totes on a budget. The ThermoPro TP357 is the better buy if you have one or two storage zones that matter more and you want the stronger fit for closed storage you do not keep eyes on.
When to skip both
- If you still leave filament fully exposed on an open shelf, storage discipline matters more than which Bluetooth sensor you buy.
- If the real problem is already-wet nylon, TPU, or PETG, you may need a dryer or sealed-storage upgrade more than another monitoring gadget.