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Last month (Feb 2019) I purchased a refurbished MP Select Mini V1 3D Printer for $89 USD (with free shipping). The flash price quickly ended, sold out. After the unboxing I found that mine was new (not refurbished). But I had to replace the extruder's cooling fan because it was too noisy. Monoprice did not respond to my email request for a replacement part. Fortunately I had a 12VDC 30mm fan that fit, so problem solved. I quickly discovered that WiFi connections were unreliable. For the record, it works fine when the printer is close to the router in my living room closet. But I need to print elsewhere. And the short range is understandable because the WiFi antenna is inside the printer, surrounded by the heavy sheet metal case. The solution is to convert the printer to use an external antenna. Before I talk about my antenna hack, I would like to point out that there is a fantastic wiki site that discusses a variety of mods for this printer. It includes instructions on how to enable WiFi connectivity, which is a hidden (unadvertised) feature of the V1 printer. I recommend that all MP Select Mini owners bookmark the Wiki: https://www.mpselectmini.com/start With all the formalities out of the way it's time to talk about the Wi-Fi antenna modification. Let's start with some fine print. It's not a hack for the typical mortal. Things to consider: It voids the warranty. Blame only yourself if things don't go as planned. Altering RF circuitry is not like working on a traditional DC circuit. In the RF domain *everything* matters. Good SMD soldering tools and PCB rework experience is a prerequisite. This hack is difficult/risky so proceed with caution. You've been warned. Before you start the modification, first confirm that your printer's WiFi is working. I shouldn't need to say this since the mod is for users that are unhappy with the RF range they are currently getting. But some hackers like to do mods just for the sport of it, so that's the reason for advising to fully test it out before any hacking.
Earlier this year a fellow [befinitiv] started a personal blog that follows the development of his DiY Wi-Fi based FPV video system. It uses a unique Wi-Fi communication mode named wifibroadcast. Rather than repeat what he's written, I suggest starting here: https://befinitiv.wordpress.com/wifibroadcast-analog-like-transmission-of-live-video-data/ In summary, it is a low cost Hi-Def FPV video system with low latency. Range is expected to be about 1km with upgraded antennas. What is cool is that it uses easy-to-buy components and has simple wiring requirements (connect some cables). It should work with any FPV monitor or goggles that have an HDMI video input. BTW, I learned about this project last month from hackaday: http://hackaday.com/2015/06/13/wifibroadcast-makes-wifi-fpv-video-more-like-analog/ Here's a video of the developer's first FPV test flight from May 2015: I've ordered all the components I think are needed and the cost was well under $200 USD (for everything but a monitor). Below is a photo of the two boxed Raspberry Pi's and TP-link WiFi dongles that the postal carrier dropped off a few days ago. I'm still waiting for the HD camera and some cables to arrive. Then the fun begins! It's a good thing my recently built DiY FPV Goggles support HDMI video.