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                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                   -----------

                                    FORM 8-K

                                 CURRENT REPORT

                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934

Date of report (Date of earliest event reported): SEPTEMBER 19, 2001


                                 PLANETCAD INC.
               (Exact Name of Registrant as Specified in Charter)

       DELAWARE                       0-288-42                 84-1035353
(State of Incorporation)      (Commission File Number)        (IRS Employer
                                                            Identification No.)

    2520 55TH STREET, SUITE 200
    BOULDER, COLORADO                                             80301
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(Address of Principal Executive Offices)                       (Zip Code)

Registrant's telephone number, including area code: (303) 209-9100
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                                       N/A
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          (Former Name or Former Address, if Changed Since Last Report)








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ITEM 5. OTHER EVENTS.

         On September 19, 2001, PlanetCAD Inc. issued a press release relating
to its corporate realignment program. A copy of the press release is attached
hereto as an exhibit.

ITEM 7. FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS.

(a)      Not applicable.

(b)      Not applicable.

(c)      Exhibits.

         99.1     Press release of PlanetCAD dated September 19, 2001.

                                   SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                             PLANETCAD INC.


Date:  September 20, 2001                    By: /s/  JOY GODESIABOIS
       ------------------                       -------------------------------
                                             Name: Joy Godesiabois
                                             Title:  Chief Financial Officer




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                                  EXHIBIT INDEX


<Table>
<Caption>
EXHIBIT
NUMBER        DESCRIPTION                                               PAGE
-------       -----------                                               ----
                                                                 
99.1          Press release of PlanetCAD dated September 19, 2001.        4
</Table>