UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                   SCHEDULE TO

            Tender Offer Statement under Section 14(d)(1) or 13(e)(1)
                     of the Securities Exchange Act of 1934



                                 PlanetCAD Inc.
- --------------------------------------------------------------------------------
                       (Name of Subject Company (issuer))

                         PCD Investments, LLC (Offeror)
- --------------------------------------------------------------------------------
            (Names of Filing Persons (identifying status as offeror,
                            issuer or other person))

                     Common Stock, $0.01 par value per share
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                  72704Y 10 3
- --------------------------------------------------------------------------------
                      (CUSIP Number of Class of Securities)

Eric A. Weissmann                 copy to: Matthew R. Perkins, Esq.
PCD Investments, LLC                       Jacobs Chase Frick Kleinkopf & Kelley
1871 Folsom Street, Suite 106              1050 17th Street, Suite 1500
Boulder, CO 80302                          Denver, CO  80265
303-526-7636                               303-685-4800
- --------------------------------------------------------------------------------
           (Name, address, and telephone numbers of person authorized
       to receive notices and communications on behalf of filing persons)
                            Calculation of Filing Fee

                             Transaction valuation*

                                       N/A

                              Amount of filing fee

                                       N/A

         *Set forth the amount on which the filing fee is calculated and state
         how it was determined.

[ ]      Check the box if any part of the fee is offset as provided by Rule
         0-11(a)(2) and identify the filing with which the offsetting fee was
         previously paid. Identify the previous filing by registration statement
         number, or the Form or Schedule and the date of its filing.


                                Amount Previously Paid:
                                                        ------------------------
                                Form or Registration No.:
                                                          ----------------------
                                Filing Party:
                                              ----------------------------------
                                Date Filed:
                                            ------------------------------------

[X]   Check the box if the filing relates solely to preliminary communications
      made before the commencement of a tender offer.

Check the appropriate boxes below to designate any transactions to which the
statement relates:

[X] third-party tender offer subject to Rule 14d-1.

[ ] issuer tender offer subject to Rule 13e-4.

[X] going-private transaction subject to Rule 13e-3.

[ ] amendment to Schedule 13D under Rule 13d-2

Check the following box if the filing is a final amendment reporting the results
of the tender offer:  [ ]


                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                 --------------

                                  SCHEDULE 13D
                                 (Rule 13d-101)

                    INFORMATION TO BE INCLUDED IN STATEMENTS
                       FILED PURSUANT TO RULE 13d-1(a) AND
                      AMENDMENTS THERETO FILED PURSUANT TO
                                  RULE 13d-2(a)

                                (AMENDMENT NO. 9)

                                 PlanetCAD Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                     Common Stock, $0.01 par value per share
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)
                                  72704Y 10 3
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                                 Eric Weissmann
                              PCD Investments, LLC
                          1871 Folsom Street, Suite 106
                             Boulder, Colorado 80302
                                  303-526-7636
- --------------------------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                 March 19, 2002
- --------------------------------------------------------------------------------
             (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 that is the subject of this Schedule 13D, and is
filing this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the
following box [ ].

Note: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Rule 13d-7(b) for other
parties to whom copies are to be sent.

- ----------

         (1) The remainder of this cover page shall be filled out for a
reporting person's initial filing on this form with respect to the subject class
of securities, and for any subsequent amendment containing information which
would alter disclosures provided in a prior cover page.

         The information required on the remainder of this cover page shall not
be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934, as amended (the "Act"), or otherwise subject to the liabilities of
that section of the Act but shall be subject to all other provisions of the Act
(however, see the Notes).

                         (Continued on following pages)





- ---------------------                                          -----------------
CUSIP No. 72704Y 10 3                   13D                    Page 2 of 7 Pages
- ---------------------                                          -----------------

- --------------------------------------------------------------------------------
1         NAMES OF REPORTING PERSONS
          I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

          PCD INVESTMENTS, LLC                  I.D. NO. 84-1607522
- --------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*              (a) [ ]
                                                                         (b) [ ]

- --------------------------------------------------------------------------------
3         SEC USE ONLY

- --------------------------------------------------------------------------------
4         SOURCE OF FUNDS*

          WC
- --------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEM 2(d) or 2(e)                                                  [ ]

- --------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION

          COLORADO, UNITED STATES
- --------------------------------------------------------------------------------
   NUMBER OF               7     SOLE VOTING POWER                     1,863,809
     SHARES               ------------------------------------------------------
  BENEFICIALLY             8     SHARED VOTING POWER                           0
    OWNED BY              ------------------------------------------------------
      EACH                 9     SOLE DISPOSITIVE POWER                1,863,809
   REPORTING              ------------------------------------------------------
  PERSON WITH             10     SHARED DISPOSITIVE POWER                      0
- --------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          1,863,809
- --------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
          CERTAIN SHARES*                                                    [ ]

- --------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
          15.0%

- --------------------------------------------------------------------------------
14        TYPE OF REPORTING PERSON*

          OO
- --------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!




- ---------------------                                          -----------------
CUSIP No. 72704Y 10 3                   13D                    Page 3 of 7 Pages
- ---------------------                                          -----------------

- --------------------------------------------------------------------------------
1         NAMES OF REPORTING PERSONS
          I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

          GARY M. JACOBS
- --------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*              (a) [ ]
                                                                         (b) [ ]

- --------------------------------------------------------------------------------
3         SEC USE ONLY

- --------------------------------------------------------------------------------
4         SOURCE OF FUNDS*

          NOT APPLICABLE
- --------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEM 2(d) or 2(e)                                                  [ ]

- --------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION

          UNITED STATES OF AMERICA
- --------------------------------------------------------------------------------
   NUMBER OF               7     SOLE VOTING POWER                             0
     SHARES               ------------------------------------------------------
  BENEFICIALLY             8     SHARED VOTING POWER                   1,863,809
    OWNED BY              ------------------------------------------------------
      EACH                 9     SOLE DISPOSITIVE POWER                        0
   REPORTING              ------------------------------------------------------
  PERSON WITH             10     SHARED DISPOSITIVE POWER              1,863,809
- --------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          1,863,809
- --------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
          CERTAIN SHARES*                                                    [ ]

- --------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
          15.0%

- --------------------------------------------------------------------------------
14        TYPE OF REPORTING PERSON*

          IN
- --------------------------------------------------------------------------------


                      *SEE INSTRUCTIONS BEFORE FILLING OUT!




- ---------------------                                          -----------------
CUSIP No. 72704Y 10 3                   13D                    Page 4 of 7 Pages
- ---------------------                                          -----------------

- --------------------------------------------------------------------------------
1         NAMES OF REPORTING PERSONS
          I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

          ERIC A. WEISSMANN
- --------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*              (a) [ ]
                                                                         (b) [ ]

- --------------------------------------------------------------------------------
3         SEC USE ONLY

- --------------------------------------------------------------------------------
4         SOURCE OF FUNDS*

          NOT APPLICABLE
- --------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEM 2(d) or 2(e)                                                  [ ]

- --------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION

          UNITED STATES OF AMERICA
- --------------------------------------------------------------------------------
   NUMBER OF               7     SOLE VOTING POWER                             0
     SHARES               ------------------------------------------------------
  BENEFICIALLY             8     SHARED VOTING POWER                   1,863,809
    OWNED BY              ------------------------------------------------------
      EACH                 9     SOLE DISPOSITIVE POWER                        0
   REPORTING              ------------------------------------------------------
  PERSON WITH             10     SHARED DISPOSITIVE POWER              1,863,809
- --------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          1,863,809
- --------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
          CERTAIN SHARES*                                                    [ ]

- --------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
          15.0%

- --------------------------------------------------------------------------------
14        TYPE OF REPORTING PERSON*

          IN
- --------------------------------------------------------------------------------


                      *SEE INSTRUCTIONS BEFORE FILLING OUT!




- ----------------------                                         -----------------
CUSIP No. 72704Y 10 3                   13D                    Page 5 of 7 Pages
- ----------------------                                         -----------------

ITEM 4.           PURPOSE OF TRANSACTION.

         As previously publicly disclosed, PCD Investments, LLC ("PCD") has made
various alternative proposals to the board of directors of PlanetCAD Inc. (the
"Issuer") with respect to an acquisition of the Issuer at a premium to its
trading price. PCD has also stated that it would initiate a tender offer if the
parties could not reach an agreement regarding one of PCD's proposals. The
Issuer did not accept any of PCD's proposals. Additionally, on March 11, 2002,
prior to any substantive discussions with PCD regarding its proposals, the
Issuer announced that it had adopted a stockholder rights plan (the "Poison
Pill") relating to the common stock of the Issuer. The Poison Pill provides that
the commencement of a tender offer, the consummation of which would result in
any person having beneficial ownership of 15% or more of the outstanding shares
of common stock of the Issuer, is one trigger of the rights underlying the
Poison Pill. (A complete description of the Poison Pill is available in the
public filings of the Issuer). The Issuer's adoption of the Poison Pill has had
the effect of making PCD's proposed tender offer prohibitively expensive.

         Therefore, due to the implementation of the Poison Pill, PCD is
assessing its options with regard to its investment in the Issuer, but does not
currently plan to commence a tender offer regarding the common stock of the
Issuer.

         As previously disclosed, on March 8, 2002, in accordance with the
Bylaws of the Issuer, PCD gave notice to the Issuer of its intention to nominate
(at the 2002 annual meeting of stockholders) six individuals to serve as members
of the board of directors of the Issuer. Additional information regarding such
individuals will be available in PCD's proxy statement when filed with the
Securities and Exchange Commission.


- ---------------------                                          -----------------
CUSIP No. 72704Y 10 3                   13D                    Page 6 of 7 Pages
- ---------------------                                          -----------------

ITEM 7.           MATERIAL TO BE FILED AS EXHIBITS.

         Exhibit 1         Agreement of the Reporting Persons to the filing of
                           this Statement on behalf of each of them.



- ---------------------                                          -----------------
CUSIP No. 72704Y 10 3                   13D                    Page 7 of 7 Pages
- ---------------------                                          -----------------

                                    SIGNATURE

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

                                        Date: March 19, 2002


                                        PCD INVESTMENTS, LLC


                                        By:           /s/ Eric A. Weissmann
                                           -------------------------------------
                                                 Eric A. Weissmann, President



                                                       /s/ Gary M. Jacobs
                                        ----------------------------------------
                                        Gary M. Jacobs



                                                        /s/ Eric A. Weissmann
                                        ----------------------------------------
                                        Eric A. Weissmann





                               INDEX TO EXHIBITS

<Table>
<Caption>
EXHIBIT
NUMBER      DESCRIPTION
- -------     -----------
         

  1         Agreement of the Reporting Persons to the filing of this Statement
            on behalf of each of them.
</Table>



                                                                       EXHIBIT 1

                             JOINT FILING AGREEMENT

         In accordance with Rule 13d-1(k) under the Securities Exchange Act of
1934, as amended, the undersigned hereby agree to this Amendment No. 9 to the
joint filing with all other Reporting Persons (as such term is defined in the
Schedule 13D referred to below) on behalf of each of them of a statement on
Schedule 13D (including amendments thereto) with respect to the Common Stock,
par value $.01 per share, of PlanetCAD Inc. This Agreement may be executed in
any number of counterparts all of which taken together shall constitute one and
the same instrument.

         IN WITNESS WHEREOF, the undersigned hereby execute this Agreement this
19th day of March, 2002.

                                        PCD INVESTMENTS, LLC


                                        By:           /s/ Eric A. Weissmann
                                           -------------------------------------
                                                 Eric A. Weissmann, President



                                                   /s/ Eric A. Weissmann
                                        ----------------------------------------
                                        Eric A. Weissmann



                                                   /s/ Gary M. Jacobs
                                        ----------------------------------------
                                        Gary M. Jacobs