$Proto Labs(PRLB)$ 8-K - Current report Filed: 2015-04-06 AccNo: 0001437749-15-006901 Size: 128 KBItem 5.02: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain OfficersItem 9.01: Financial Statements and Exhib 网页链接