Happymodel ES900TX Cover w/ Exposed USB & dip switches

thingiverse

I designed this cover for the Happymodel ES900TX module, to have easy access to both the USB port and dip switches without removing the cover. I often use my ES900TX in airport mode for mavlink telemetry. Using a TX module as an airport device requires a USB cable to be plugged in. Switching between normal and airport mode on the ES900TX also requires moving dip switches inside the TX. The original case unfortunately covers both the USB and the jumpers. So I designed this cover with holes in the right places to fix these problems. It just replaces the original cover, and screws on to the original back case half with the original screws. The module will still fit in a JR bay with the cover installed. I included a spot for a 20mm cooling fan commonly used on the es900tx. The antenna is offset to the left from the original to make room for USB. The offset fits my tx16s fine. I figure it should not cause issues with any other transmitters as well. The additional depth provided by the cover makes a larger footprint on the bottom. This conveniently allows the module to securely stand vertically on a table. So I left out the 1/4-20 t-nut I often add to GCS antenna devices; Velcro or VHT tape can be used for tripod mounting if desired. Print without supports, no rotation required. I used TPU because that's what was loaded in my printer at the time, but probably any temperature resistant filament could be used (ABS, PETG, etc). This design reuses the original screws for both the cover and fan. The stock UFL-SMA adapter fits fine as well; use the stock SMA nut and washer to secure it to the hole in the cover (throw away the split washer... split washers have long since been proven worthless for virtually all applications, yet somehow we still find them on modern assemblies). Don't forget to check the fan plug before screwing the cover back on; my fan plug is loose falls out fairly easily and had to be reinserted at least twice during reassembly. If you print in TPU and noticed the module is now a bit tricky to lock into a JR bay... it's because the TPU is deformed past the edge due to overtightening of the cover screws. Back these screws off a tad and it should snap on like before.