EXHIBIT 5.1

May 30, 2014

Board of Directors

3D Systems Corporation

333 Three D Systems Circle

Rock Hill, South Carolina 29730

Ladies and Gentlemen:

I am the Vice President, General Counsel and Secretary of 3D Systems Corporation, a Delaware corporation (the “Company”), and as such I have acted as counsel to the Company in connection with that certain Registration Statement on Form S-3 (Registration No. 333-196284) (the “Registration Statement”) of the Company filed with the Securities and Exchange Commission (the “Commission”) on May 27, 2014 pursuant to the Securities Act of 1933, as amended (the “Securities Act”), and the offering pursuant to a prospectus supplement dated May 27, 2014 (the “Prospectus Supplement”) of (i) 5,950,000 shares of the common stock of the Company, $0.001 par value per share (the “Common Stock”) and (ii) 892,500 shares of Common Stock as an over-allotment option, for an aggregate of amount of 6,842,500 shares (the “Shares”), to be issued and sold by the Company.

The Company has entered into an Underwriting Agreement with Canaccord Genuity Inc. and the other parties thereto (the “Underwriting Agreement”) dated as of May 27, 2014 pursuant to which they have respectively agreed to issue and sell the Shares. All capitalized terms that are not defined herein have the meanings assigned to them in the Registration Statement.

3D Systems Corporation — 333 Three D Systems Circle — Rock Hill, SC 29730 — USA

Phone: 803.326.3900 — www.3dsystems.com — NYSE: DDD

Board of Directors

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May 30, 2014

This opinion is rendered pursuant to Item 9.01 of Form 8-K and Item 601(b)(5)(i) of Regulation S-K promulgated under the Securities Act.

As counsel for the Company, in addition to participating in the preparation of the Registration Statement and the Prospectus Supplement, I have examined the following documents:

I have also examined originals or copies, certified or otherwise identified to my satisfaction, of such records of the Company and such agreements, other certificates and receipts of public officials, certificates of officers or other representatives of the Company and others, and such other documents, and I have made such other inquiries, as I have deemed necessary or appropriate as a basis for the opinions set forth below. The opinions set forth in paragraph 1 below are based solely on the Good Standing Certificate.

Based on the foregoing, I am of opinion that:

Board of Directors

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May 30, 2014

I consent to the filing of this opinion as Exhibit 5.1 to the Company’s Current Report on Form 8-K filed with the Commission on the date hereof and to the reference to me under the heading “Legal Matters” in the Prospectus Supplements. In giving this consent, I do not admit that I am in the category of persons whose consent is required by Section 7 of the Securities Act or the rules and regulations promulgated thereunder.

This opinion is limited to the matters stated in this letter, and no opinions may be implied or inferred beyond the matters expressly stated in this letter. The opinions expressed in this letter speak only as of its date. I do not undertake to advise you of any changes in the opinions expressed herein from matters that might arise or be brought to my attention.

I wish to advise you that I am a member of the Bar of the State of North Carolina. Accordingly, I express no opinion as to any laws other than the laws of the State of North Carolina, the corporate laws of the State of Delaware and the Federal laws of the United States.