<PAGE>
===============================================================================
/------------------------------/
/ OMB APPROVAL /
/------------------------------/
/ OMB Number: 3235-0104 /
/ Expires: September 30, 1998 /
/ Estimated average burden /
/ hours per response...... 0.5 /
/------------------------------/
+--------+
| FORM 3 | U.S. SECURITIES AND EXCHANGE COMMISSION
+--------+ WASHINGTON, D.C. 20549
INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES
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(f) of the Investment Company Act of 1940
(Print or Type Responses)
- --------------------------------------------------------------------------------
1. Name and Address of Reporting Person*
Proactive-DTM, L.P.
----------------------------------------------------------------------------
(Last) (First) (Middle)
c/o Proactive Finance Group, LLC
221 West 6th Street, Suite 1520
----------------------------------------------------------------------------
(Street)
Austin TX 78701
----------------------------------------------------------------------------
(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year) 2/12/99
--------------
3. IRS Identification Number of Reporting Person if an Entity
(Voluntary)
--------------
4. Issuer Name and Ticker or Trading Symbol DTM Corporation (DTMC)
-----------------------------------
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)
[ ] Director [ ] Officer [X] 10% Owner [ ] Other
(give title below) (specify below)
----------------------------------------------------------------------------
6. If Amendment, Date of Original (Month/Day/Year)
----------------------------
7. 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 BENEFICIALLY OWNED
<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
1. Title 2. Amount of 3. Ownership Form: 4. Nature of
of Securities Bene- Direct (D) or Indirect Bene-
Security ficially Owned Indirect (I) ficial Ownership
(Instr. 4) (Instr. 4) (Instr. 5) (Instr. 5)
- --------------------------------------------------------------------------------
<S> <C> <C> <C>
- --------------------------------------------------------------------------------
Common Stock, par value 3,157,190 1 General Partner of
$.0002 per share DTM Acquisition
("Common Stock") Company, L.P./1/
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
</TABLE>
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
5(b)(v).
<PAGE>
FORM 3 (continued)
TABLE II--DERIVATIVE SECURITIES BENEFICIALLY OWNED
(e.g., puts, calls, warrants, options, convertible securities)
<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------------------
1. Title of Derivative 2. Date Exer- 3. Title and Amount of Securities 4. Conversion 5. Ownership 6. Nature of In-
Security (Instr. 4) cisable and Underlying Derivative Security or Form of direct Bene-
Expiration (Instr. 4) Exercise Derivative ficial
Date Price Security: Ownership
(Month/Day/ of Direct (D) (Instr. 5)
Year) Derivative or In-
---------------------------------------------------- Security direct (I)
Date Expira- Amount or (Instr. 5)
Exer- tion Title Number of
cisable Date Shares
- ------------------------------------------------------------------------------------------------------------------------------------
<S> <C> <C> <C> <C> <C> <C> <C>
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE>
Explanation of Responses:
/1/On January 2, 1999, Proactive Finance Group, LLC ("Proactive") entered into a
Stock Purchase Agreement with the B.F. Goodrich Company ("Goodrich") which
provides, among other things and upon the terms and conditions set forth
therein, that Goodrich will sell, and Proactive will purchase, all of Goodrich's
right, title and interest in and to 3,157,190 shares of Common Stock (the
"Shares"). On February 12, 1999, Proactive assigned its rights under the Stock
Purchase Agreement to DTM Acquisition Company, L.P. ("DTMAC"). The general
partner of DTMAC is Proactive-DTM, L.P. ("Pro-DTM"), and the general partner of
Pro-DTM is Proactive. On February 12, 1999, DTMAC acquired the Shares from
Goodrich.
**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.
Potential persons who are to respond to the collection of information contained
in this form are not required to respond unless the form displays a currently
valid OMB Number.
Proactive-DTM, L.P.
By: Proactive Finance Group, LLC, its general partner
By: /s/ ANTHONY MARIOTTI 3/11/99
------------------------------- -----------------
**Signature of Reporting Person Date
Anthony Mariotti, Managing Member
of Proactive Finance Group, LLC
