Subsequent Events	3 Months Ended
Mar. 31, 2017
Subsequent Events
Subsequent Events	NOTE 7 – Subsequent Events On May 1, 2017, the Company completed funding a loan in the principal amount of $250,000 to Jaguar Precision Machine, LLC, a New Mexico limited liability company, pursuant to a Secured Convertible Promissory Note dated May 1, 2017 delivered by Jaguar to the Company. The loan bears interest at the rate of 7% per annum, is due and payable in full on May 1, 2018, is secured by certain assets of Jaguar, and is convertible at the Company’s option into 10% of the outstanding shares of the common stock of Jaguar unless Jaguar exercises its right under specified circumstances to repay all principal and accrued interest on the loan. The purpose of the loan is to provide working capital to Jaguar to, among other things, stand up a metallugical laboratory and become ASM9100 certified for contracts related to AM of high-precision aerospace and defense components, in furtherance of our strategic alliance. Sigma will receive from Jaguar priority for use of certain machines and services of Jaguar. On April 19, 2017, the Company granted a stock option to an officer to purchase up to of 20,000 shares of common stock, at an exercise price equal to $3.27 per share, which was the closing market price of our common stock on April 19, 2017 (i.e., the date of grant), which option is subject to vesting over a12 month vesting period.

Subsequent Events

3 Months Ended

Mar. 31, 2017

NOTE 7 – Subsequent Events

On May 1, 2017, the Company completed funding a loan in the principal amount of $250,000 to Jaguar Precision Machine, LLC, a New Mexico limited liability company, pursuant to a Secured Convertible Promissory Note dated May 1, 2017 delivered by Jaguar to the Company. The loan bears interest at the rate of 7% per annum, is due and payable in full on May 1, 2018, is secured by certain assets of Jaguar, and is convertible at the Company’s option into 10% of the outstanding shares of the common stock of Jaguar unless Jaguar exercises its right under specified circumstances to repay all principal and accrued interest on the loan. The purpose of the loan is to provide working capital to Jaguar to, among other things, stand up a metallugical laboratory and become ASM9100 certified for contracts related to AM of high-precision aerospace and defense components, in furtherance of our strategic alliance. Sigma will receive from Jaguar priority for use of certain machines and services of Jaguar.

On April 19, 2017, the Company granted a stock option to an officer to purchase up to of 20,000 shares of common stock, at an exercise price equal to $3.27 per share, which was the closing market price of our common stock on April 19, 2017 (i.e., the date of grant), which option is subject to vesting over a12 month vesting period.