Heya, Julius!
Thanks for your input. I think das ist die Schwarzheizungsventilrohr, if one makes it in German way, or die Tube, if one makes in in really German way.
Re pricing: 45..50e + shipping should leave me a margin for a little bit of profit and even a discount, e.g. for Christmas or Oktoberfest. Nylon PA11 and PA12 are both rather heat-resistant plastics, featuring heat deflection temperatures of 185C and 175C respectively. It can be printed in stainle... in Inox SAE 316L as well, but that will cost one an arm an a leg, i.e. towards to 200e.
I can also come up with a model of just a tube featuring no flange for the electromagnetic valve - this could be helpful option for those who want to go with external industrial valve or E36 valve in the engine compartment. The price should be about the same, maybe ~5e cheaper.
For what its worth, I'm also working on luftwaff... luftmass... luftmengenmesserredisign: it'll be based on (contactless) digital Hall-effect angle position sensor and microcontroller. Digital design will allow to use a single platform for multiple products: M40/42/43, M20, even LH-Jetronic on M10/S14. Sounds interesting? If so, let me know - and I'll open a new thread on that matter.
Gruesse,
Zig