Sec Form 4/A Filing - KOECK HERBERT @ 3D SYSTEMS CORP - 2019-08-15

FORM 4/A 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 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person KOECK HERBERT 2. Issuer Name and Ticker or Trading Symbol 3D SYSTEMS CORP [ DDD] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) EVP, Global Go To Market (Last) (First) (Middle) 333 THREE D SYSTEMS CIRCLE 3. Date of Earliest Transaction (MM/DD/YY) 08/15/2019 (Street) ROCK HILL, SC29730 4. If Amendment, Date Original Filed (MM/DD/YY) 08/16/2019 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction 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 ( 1 ) 08/15/2019 F 3,676 D $ 6.55 35,795 D Common Stock ( 1 ) 72,040 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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

Reporting Owners Report ing Owner Name / Address Relationships Director 10% Owner Officer Other KOECK HERBERT 333 THREE D SYSTEMS CIRCLE ROCK HILL, SC29730 EVP, Global Go To Market Signatures /s/ Andrew M. Johnson, Attorney-in-Fact, for Herbert Koeck 09/10/2019 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This Form 4/A amends the original Form 4 filed on August 16, 2019 to clarify that the shares reported were withheld to satisfy taxwithholding obligations with respect to the vesting on August 15, 2019 of a grant of restricted stock units (RSUs) originally made onDecember 4, 2017. The original Form 4 erroneously reported the transaction as relating to securities beneficially owned by the ReportingPerson and reported separately from the RSUs in Table I. This Form 4/A further corrects the number ofshares of common stock reported as beneficially owned by the Reporting Person in Table 1 to reflect (i) a reduction of 3,676 shares thatwere withheld to satisfy tax withholding obligations with respect to the vesting on August 15, 2019 from the number of RSUs beneficiallyowned in the first row on Table I, and (ii) a corresponding increase of 3,676 shares of of other securities beneficially owned by theReporting Person.

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).

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