SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

Schedule 13G/A

Under the Securities Exchange Act of 1934

(Amendment No. 2)*

STEN Corporation

Name of Issuer

Common Stock

Title of Class of Securities

 85916A  10  1

CUSIP Number

December 31, 2006

Date of Event That Requires Filing of this Statement

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

¨

Rule 13d-1(b)

þ

Rule 13d-1(c)

¨

Rule 13d-1(d)

*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 the disclosures provided in a prior cover page.

The information required in 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 (“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).

Page 4 of 4 Pages

Item 1.

(a)

Name of Issuer

The name of the issuer is STEN Corporation.

(b)

Address of Issuer’s Principal Executive Offices

10275 Wayzata Blvd S, Suite 310

Minnetonka, MN 55305

Item 2.

(a)

Name of Person Filing.  Jeffrey A. Zinnecker

(b)

Address of Principal Business Office or, if none, Residence.  

3841 205th Lane NW

Oak Grove, Minnesota  55303

(c)

Citizenship. Minnesota

(d)

Title of Class of Securities.  Common Stock

(e)

CUSIP Number.  85916A  10  1

Item 3.

If this statement is filed pursuant to Rule 13d-1(b), or 13d-2(b), check whether the person filing is a:

(a)

¨

Broker or Dealer registered under Section 15 of the Act

(b)

¨

Bank as defined in Section 3(a)(6) of the Act

(c)

¨

Insurance Company as defined in Section 3(a)(19) of the Act

(d)

¨

Investment Company registered under Section 8 of the Investment Company Act

(e)

¨

Investment Adviser in accordance with Rule 13d-1(b)(1)(ii)(E).

(f)

¨

Employee Benefit Plan, Pension Fund which is subject to the provisions of the Employee Retirement Income Security Act of 1974 or Endowment Fund; see §240.13d-1(b)(1)(ii)(F)

(g)

¨

Parent Holding Company, in accordance with §240.13d-1(b)(ii)(G) (Note:  See Item 7)

(h)

¨

Group, in accordance with §240.13d-1(b)(ii)(H)

Item 4.

Ownership

(a)

Amount beneficially owned:  As of December 31, 2006, Mr. Zinnecker holds 74,011 shares of common stock of STEN Corporation and options exercisable within 60 days of December 31, 2006 to purchase an additional 28,387 shares of common stock.  Additionally, Zinncorp, Inc. holds 10,600 shares of common stock of STEN Corporation.  Mr. Zinnecker, as the president and sole shareholder of Zinncorp, Inc., may be deemed to be the beneficial owner of the 10,600 shares of common stock held by Zinncorp, Inc.

(b)

Percent of Class:  5.0% based upon 1,981,207 shares outstanding as of January 22, 2007 as reported in the STEN Corporation Annual Report on Form 10-KSB/A for the year ended October 1, 2006.

Page 4 of 4 Pages

(c)

Number of shares as to which Mr. Zinnecker has

(i)

Sole power to vote or to direct the vote:  102,398 (includes options to purchase 28,387 shares of common stock)

(ii)

Shared power to vote or to direct the vote:  0

(iii)

Sole power to dispose or to direct the disposition of:  102,398 (includes options to purchase 28,387 shares of common stock)

(iv)

Shared power to dispose or to direct the disposition of:  0

Item 5.

Ownership of Five Percent or less of a Class.

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following   [ ].

Item 6.

Ownership of More Than Five Percent on Behalf of Another Person.  Not Applicable

Item 7.

Identification and Classification of the Subsidiary which Acquired the Security Reported on by the Parent Holding Company.  Not Applicable.

Item 8.

Identification and Classification of Members of the Group.  Not Applicable.

Item 9.

Notice of Dissolution of Group.  Not Applicable.

Item 10.

Certification.

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

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.

Dated:  February  9, 2007

/s/ Jeffrey A. Zinnecker

Jeffrey A. Zinnecker