Reddit mentions of Vacuum Pump - 12V

If you're spending that much for a brake bleed kit, get an electric vacuum pump for ease. under $50 USD

vacuum pump

12v adapter

wires

I threw this together with the first 12v adapter I could find on amazon. If you want the run to pump better with more vacuum, get an adapter that pushes more than 2 amps. I have a 5 amp adapter and the pump runs like a top.

You’ll need a power supply and tubing

Dude you know the homebrew vacuum pump in the wiki is like $40 right? :b

Edit: $20 Here

This is the 12 volt pump I have started using. Its loud, but effective.

https://www.amazon.com/dp/B00DYA21PU/ref=cm_sw_r_cp_awdb_t1_fZ72DbBSPV1K6

Vacuum Pump - 12V https://www.amazon.com/dp/B00DYA21PU/

You could control it with a 12g rgb lightstrip controller

Hard to tell if it's closed or open cell foam. But it's not just the foam itself, if the surface is rough you're likely to get some leakage. If a dog hair or something happens to be across the surface, you'll get leakage. Normally these things are insignificant but with a tiny pump it can become a factor.

You mentioned drawers and doors, but actually I'm not convinced you need the foam edges for that. They are relatively smooth surfaces unless there is some sort of raised or embossed pattern that needs to be conformed around - that's what the foam is great for. Plus drawers/doors are usually painted or lacquered so it cuts down on the surface roughness a bit.

That said, I'm starting to get the picture with the info you added. It would be hard to stick an air compressor on most RC vehicles! So the venturi is probably out. The diaphragm pump will do what you need, as long as you don't need it to be fast and you have a decent seal. Also I did some quick googling, there are a number of pumps like this and this as well. Higher pressure than your diaphragm pump but a little less flowrate. You can always double up on the pumps too.

This one claims ~-12psi @ 0.7 CFM, which should be more than enough to accomplish what you need.

Although the total tubing length will probably be pretty short on an RC vehicle, keep the tube as large as you can. The lower the pressure gets, the larger your tubing needs to be to effectively move air. If you use a tiny tube - even a short one - you can have massive losses of vacuum pressure. So -12psi at the pump becomes -5 psi at the cup. If you only have one cup and there is no leakage this won't be a big issue but it will still take longer to achieve a seal.

At work we use cups from Piab, Festo, SMC, etc... but they're not always easy to source if you have to work through a distributor. Here are a couple sources I found though:

Vacmotion


Piab No idea where you're located, you can find a distributor with easy online ordering if you look for a bit.