Hi, it seems most naturally to use disposable syringes as a base for cartridges- it has already pistons built in and would eliminate much work when designing and producing cartridges from scratch. Probably, it's outlet should be made wider for dense substances. As actuator I would use probably a step motor with some gear. I would consider the possible design more detailed, but for it I'd like to know:
1. the amount (volume ) of substance needed in a cartridge
2. the range of speed at which it has to be delivered
3. do you have already any heating element in mind or is it still to be found?
4. should it be portable or stationary device?
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I'm an electronic engineer with 5 years of experience in 3D modelling using SolidWorks.
My services are: 3D modelling, 3D renderings, engineering. Have experiences in modelling for 3D printing. Good technical background.
Best regards
Anatolii