CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the reference to
our firm under the caption Experts and to the use of our report dated July 22, 2011, in Amendment No. 2 to the Registration Statement (Form S-1 No. 333-175745) and related Prospectus of Proto Labs, Inc. for the registration of
shares of its common stock.
/s/ Ernst & Young LLP
September 26, 2011