FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Bodor Robert 		2. Issuer Name and Ticker or Trading Symbol

Proto Labs Inc [ PRLB ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
VP/General Manager-Americas
(Last)          (First)          (Middle)

5540 PIONEER CREEK DRIVE 		3. Date of Earliest Transaction (MM/DD/YYYY)

6/8/2017
(Street)

MAPLE PLAIN, MN 55359
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock   6/8/2017     M    4000   A $36.41   20578   (1) D    
Common Stock   6/8/2017     S (2)    4000   D $66.0082   (3) 16578   D    

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Employee Stock Option (right to buy)   $36.41   6/8/2017     M         4000      (4) 12/11/2022   Common Stock   4000   $0   12000   D    

Explanation of Responses:
(1)  Reports the total number of shares of Common Stock of the issuer held by the reporting person as of June 12, 2017, including a total of 508 shares of Common Stock of the issuer purchased by the reporting person through the issuer's Employee Stock Purchase Plan program on May 15, 2014, November 15, 2014, and May 15, 2015.
(2)  Sale effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 9, 2017.
(3)  Reflects the weighted average price of 4,000 shares of common stock of Proto Labs, Inc. sold by the reporting person on June 8, 2017, with sale prices ranging from $66.00 to $66.05 per share. The reporting person undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.
(4)  The option vests as to 20% of the shares in five annual installments beginning in December 11, 2013.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Bodor Robert
5540 PIONEER CREEK DRIVE
MAPLE PLAIN, MN 55359

VP/General Manager-Americas

Signatures
/s/ Samuel A. Rosenbaum, attorney-in-fact 6/12/2017
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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