I have put together some ideas and figures for a DIY kit
List of what it would include:
RP2040 PCB + firmware installed
Screen
Rotary dial
Mosfet unit
Thermocouple lead with ptfe + kapton tape protection
Heater:
Outer quartz tube + nichrome coil
Inner quartz 1mm thick wall tube
Inner glass 1.5mm thick wall normal test tube
Inner quartz 1.5mm thick wall tube - (not sure if i can get this yet)
Straws:
12mm OD quartz 1mm wall thickness
12mm OD quartz 1.5mm wall thickness
12mm OD glass 1.5mm wall thickness
16mm OD quartz 1.5-2mm wall thickness - (not sure about this yet as well)
SS Mesh for screens
Depending on what people want to make i can add stuff like battery holders, deans connectors, various lengths of wire etc - also i could do pre-soldered kits so with screw in connectors for the thermocouple and other leads so if you want to put the screen or dial else where its easy.
All firmware code is open source so how it works can be fiddled with as much as desired, I am planning on adding a Wattage mode and also profiles so you can jump between different power sources, timers, pid settings etc.
I suspect each kit is going to be around £200 just depends on numbers as the quartz tubes and pcbs will be cheaper depending on volume.
I'm happy putting together a simple version like the design I have been using for the past year or so with the powering cables forming the handle and using a glass jar as a stand for when not in use and with a little junction box to house electronics. I suppose the basic version like that wouldnt be less than £250-300
Post or do send me a pm if interested so i can see if there are enough people who want one