I want to purchase the membranes with free plans, can I use my shop vac with this build instead of buying a vacuum pump?

No.  A shop vac in comparison to a vacuum pump, moves a higher volume of air at a lower negative pressure (vacuum).  A vacuum pump moves a low volume of air at a high negative pressure (vacuum).  There is no good way to connect a shop vac to the DIY build and even if you did so, the results you would receive when vacuum forming would be of poor quality.  We do not recommend using a shop vac at all.  We recommend purchasing a vacuum pump, even if it is a cheap one, over trying to use a shop vac.

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