3 D SYSTEMS CORP
SC 13D, 1997-06-23
PREPACKAGED SOFTWARE
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934


                             3D SYSTEMS CORPORATION
                                (Name of Issuer)

                                  COMMON STOCK
                                 $.001 PAR VALUE
                         (Title of Class of Securities)


                                    88554D205
                                 (CUSIP Number)

                                 Kevin S. Moore
                Senior Vice President and Chief Financial Officer
                             The Clark Estates, Inc.
                                 30 Wall Street
                            New York, New York 10005
                            Tel. No.: (212) 269-1833

                                 With a copy to:

                             David W. Ambrosia, Esq.
                       Winthrop, Stimson, Putnam & Roberts
                             One Battery Park Plaza
                          New York, New York 10004-1490
                                 (212) 858-1208
                     (Name, Address and Telephone Number of
                      Person Authorized to Receive Notices
                               and Communications)

                                  June 13, 1997
                          (Date of Event which Requires
                            Filing of this Statement)

     If the filing  person has  previously  filed a statement on Schedule 13G to
report the acquisition  which is the subject of this Schedule 13D, and is filing
this statement because of Rule 13d-1(b)(3) or (4), check the following: [ ]


                                   Page 1 of 8

<PAGE>
                                  SCHEDULE 13D

================================================================================
CUSIP NO. 88554D205                                            Page  of 8 Pages

- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                The Clark Estates, Inc.
- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*              (a)   |_|
                                                                      (b)   |X|
- --------------------------------------------------------------------------------
   3   SEC USE ONLY
- --------------------------------------------------------------------------------
   4   SOURCE OF FUNDS*

                OO
- --------------------------------------------------------------------------------
   5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
       ITEMS 2(d) OR 2(e)                                                   |_|
- --------------------------------------------------------------------------------
   6   CITIZENSHIP OR PLACE OF ORGANIZATION

                New York
- --------------------------------------------------------------------------------
                    7  SOLE VOTING POWER

   NUMBER OF                    594,272
    SHARES         -------------------------------------------------------------
 BENEFICIALLY       8  SHARED VOTING POWER
 OWNED BY EACH                  0
   REPORTING       -------------------------------------------------------------
  PERSON WITH       9  SOLE DISPOSITIVE POWER
                                594,272
                   -------------------------------------------------------------
                   10  SHARED DISPOSITIVE POWER

                                0
- --------------------------------------------------------------------------------
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                594,272
- --------------------------------------------------------------------------------
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_|
- --------------------------------------------------------------------------------
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                5.2%
- --------------------------------------------------------------------------------
  14   TYPE OF REPORTING PERSON*

                CO
================================================================================

                                   Page 2 of 8

<PAGE>

Item 1. Security and Issuer.

                  This  Statement  relates to shares of Common Stock,  $.001 par
value per share  (the  "Common  Stock") of 3D  Systems  Corporation,  a Delaware
corporation (the "Company").  The address of the Company's  principal  executive
offices is 26081 Avenue Hall, Valencia, California 91355.

Item 2. Identity and Background.

                  (a) - (c)  This Statement is being filed by The Clark
Estates, Inc. (the "Reporting Person").

                  The  Reporting  Person is a New York  corporation  principally
engaged in the business of providing management and administrative  services for
certain institutional,  corporate, individual and trust accounts affiliated with
the Clark family.  The principal  business and principal  office  address of the
Reporting Person is 30 Wall Street, New York, New York 10005.

                  The name,  business address,  present principal  occupation or
employment of each executive  officer and director of the Reporting  Person (the
"Executive Officers and Directors") are set forth in Schedule I hereto, which is
incorporated herein by reference.

                  (d) - (e) During the last five years,  neither  the  Reporting
Person nor, to the best knowledge of the Reporting Person,  any of the Executive
Officers  and  Directors  has  (A)  been  convicted  in  a  criminal  proceeding
(excluding traffic violations or similar  misdemeanors) or (B) been a party to a
civil

                                   Page 3 of 8

<PAGE>


proceeding of a judicial or administrative body of competent jurisdiction and as
a result of such  proceeding  was or is subject to a  judgment,  decree or final
order  enjoining  future  violations of, or prohibiting or mandating  activities
subject  to,  federal or sate  securities  laws or finding  any  violation  with
respect to such laws.

                  (f) Each of the  persons  listed in this Item 2 or  Schedule I
hereto is a citizen of the United States of America.

Item 3. Source and Amount of Funds or Other Consideration.

                  All the shares of Company  Common Stock owned by the Reporting
Person were  purchased  in open market  transactions.  As of May 31,  1997,  the
Reporting Person was the beneficial owner of 549,272 shares of Common Stock. The
Reporting Person's further purchases of Common Stock are described in Item 5. As
a result of the purchase of 15,000 shares of Common Stock on June 13, 1997,  the
Reporting  Person became the beneficial  owner of 5.01% of the Common Stock. The
594,272  shares of Company  Common Stock were  acquired by funds  available  for
investment  in certain of the accounts for which the Reporting  Person  provides
management and administrative services.

Item 4. Purpose of Transaction.

                  All of the  shares of Common  Stock  have  been  acquired  for
investment  purposes.  The Reporting Person currently does not have any plans or
proposals  of the type set  forth in  Paragraphs  (a)  through  (j) of Item 4 of
Schedule 13D, except that the Reporting Person may acquire  additional shares of
Common Stock in

                                   Page 4 of 8

<PAGE>


open market transactions for investment purposes.  Any decision of the Reporting
Person  either to  purchase  additional  shares of  Company  Common  Stock or to
dispose of any of such shares will take into account various factors,  including
general economic conditions and money and stock market conditions.

Item 5. Interest in Securities of the Issuer.

                  (a) The 594,272  shares of Company  Common Stock  beneficially
owned by the  Reporting  Person  constitute  5.2% of the  outstanding  shares of
Company Common Stock (based upon an aggregate of 11,361,124  outstanding  shares
of Company  Common Stock as of April 30, 1997, as reported in the Company's Form
10- Q for the period ended March 28, 1997).

                  (b) The  Reporting  Person has sole power to vote or to direct
the vote of the shares of Company  Common  Stock  referred to in  paragraph  (a)
above and sole power to dispose or to direct the disposition of any such shares.

                  (c)      All transactions in the Company Common Stock which
were effected by the Reporting Person during the past sixty days
are set forth as follows:

Date                       Number of                          Per Share
- ----                       Shares Purchased                   Purchase Price
                           ----------------                   --------------
6-12-97                    5,000                              $6.75
6-13-97                    15,000                             $6.875
6-18-97                    15,000                             $7.25
6-19-97                    10,000                             $7.3125


                  (d) No person other than the Reporting Person has the right to
receive or the power to direct the receipt of  dividends  from,  or the proceeds
from the sale of, the Shares.

                                   Page 5 of 8

<PAGE>

                  (e)      Not applicable

Item 6. Contracts, Arrangements, Understandings or
        Relationships With Respect to Securities of the Issuer.

                  Neither the Reporting Person, nor (to the best
knowledge of the Reporting Person) any of the Executive  Officers and Directors,
has  any  contract,   arrangement,   understanding  or  relationship  (legal  or
otherwise)  with any person  with  respect  to any  securities  of the  Company,
including  but not limited to the transfer or voting of any of such  securities,
finder's  fees,  joint  ventures,  loan or option  arrangements,  puts or calls,
guarantees  of  profits,  division  of  profits  or  loss or the  giving  or the
withholding of proxies.

Item 7.           Material to be Filed as Exhibits.

                  None.


                                   Page 6 of 8

<PAGE>

                                   SIGNATURES


                  After reasonable inquiry and to the best knowledge and belief,
I certify that the information set forth in this statement is true, complete and
correct.


June 23, 1997
- -------------
Date


/s/ Kevin S. Moore
- ------------------
Signature


Senior Vice President and
Chief Financial Officer
The Clark Estates, Inc.
- -------------------------
Name/Title


                                   Page 7 of 8

<PAGE>


                                   SCHEDULE I

                       Executive Officers and Directors of
                             The Clark Estates, Inc.

                  Except where otherwise indicated, the business address of each
of the following is The Clark Estates,  Inc., 30 Wall Street, New York, New York
10005.


                                Principal Occupation
Name                            and Name of Business
- ----                            --------------------
Edward W. Stack                 President and Director
                                The Clark Estates, Inc.
                                Management Services

Jane F. Clark                   Chairman and Director
                                The Clark Estates, Inc.
                                Management Services

Kevin S. Moore                  Senior Vice President, Chief
                                Financial Officer and Director
                                The Clark Estates, Inc.
                                Management Services

William T. Burdick              Secretary
                                The Clark Estates, Inc.
                                Management Services

Anne L. Peretz                  Director
                                The Clark Estates, Inc.
                                Management Services

Marshall F. Wallach             Director
                                The Clark Estates, Inc.
                                Management Services



                                   Page 8 of 8

<PAGE>




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