I think that the Cave Box works very well overall and represents brilliant value for money compared to similar products that are available. However with any engineering project there will be technological limitations, economic realities and designer oversights that mean that any product is never going to be perfect. I have decided to list all the problems with the Cave Box (that I know about) so buyers can make informed decisions.

• The Micro Usb Plug Can Get Pulled Off. Twice I have forgotten to unplug a Cave Box before I moved the tub it was attached too and ripped off the micro usb plug. I have the equipment and expertise to replace the plug but most people buying the Cave Box would have to send the control board to me to be fixed which isn’t ideal. The solution is to remember to unplug it before moving your monotub.
• The Ultrasonic Mister Head Is Delicate. There is a white disk at the heart of the Cave Box that makes water vapour. They are a bit delicate. I’ve cracked one during assembly and had one whose performance was degraded by being in a tent with a very heavy spore load. Fortunately they are very cheap, so if yours breaks I can sell you a new one or advise you on which one to buy. They can be bought very cheaply from sellers in China or very quickly from dropshippers in the country where you live.
• I Don’t Know How Big Your Fruiting Chamber Can Be. The Cave Box has only a small humidifier. It was originally designed for use with plastic tubs. I live in a damp country where the ambient humidity is quite high and I have had success running tents with the Cave Box but I have no idea how big of a tent you will be able to run and I don’t know how well the Cave Box will work in a different climate. If you buy a Cave Box and it’s not powerful enough to run in your environment I do accept returns however you will have to pay the return shipping.
• The DHT22 Humidity Sensor isn’t Great. The Cave Box uses a DHT22 humidity sensor. The accuracy on the datasheet is absolutely adequate for the use case and they are very affordable but the temperature readings are sometimes inconsistent which suggests that the absolute accuracy of the humidity readings isn’t great. There are a lot of counterfeit sensors on the market, these counterfeit sensors are not epoxied into their shells and don’t have the branding on the front. I have found a source that I believe to be legitimate but I would rather use a sensor that no one is making fakes off and ideally also has CO2 sensing in the same package.
• I’m Using a Bodge Wire to Connect a Better Sensor. This one isn’t really an issue but I’d rather people where aware of it because it looks a bit funny. Cave Boxes will sometimes use the newer AHT20 temperaature and humidity sensor as it is slightly better than the DHT22 and easier to source reliably. To connect it to the circuit boards I have already had made I solder a wire across the circuit board, this doesn’t affect the functionality at all and won’t be the case when I’ve used up my current stock of circuit boards, but I feel it’s a shame to waste the ones I’ve already bought so I’m soldering a bodge wire on.
• The Fan Is Running At A Low Power. This hasn’t been an issue for me but I think it has the potential to cause problems. The computer fan that brings in fresh air is running at quite a low power so it doesn’t go very fast. This provides plenty of fresh air for mushrooms, but it may mean that as the fans get older and dirtier and thus have more friction there may not be enough power to make them turn at all. I’ve had Cave Box fans working for many months, and have had them get covered with spores and they still work well so this may not be an issue at all, or it may mean that buyers need to buy a new fan every few years which is not the end of the world.
• The Canning Jar lids Can Rust. I use canning jars and the rings that come with them to act as a reservoir for the Cave Box. The rings on the first jars I used went rusty on the inside as there is no rubber seal protecting the metal. I now paint the insides of the lids with a few layers of rust proof paint but I don’t know if this won’t get worn away with time. However canning rings are the kind of thing that most mushroom cultivators will have already and getting spare rings isn’t difficult at all.