Exhibit 21.1

SUBSIDIARIES OF THE REGISTRANT

All of the Company’s subsidiaries listed below are wholly owned.

Name	Jurisdiction of Incorporation or Organization
PL-US International LLC Proto Labs, Ltd. PL Euro Services Ltd. PL International UK LLP PL International Holding UK Ltd. PLJ Ltd Alphaform Ltd. PL DE Holding GmbH Proto Labs GmbH Proto Labs Eschenlohe GmbH Alphaform RPI Oy Alphaform Sweden AB Proto Labs, G.K.	United States United Kingdom United Kingdom United Kingdom United Kingdom United Kingdom United Kingdom Germany Germany Germany Finland Sweden Japan