A 3D printer made using widely available components such as arduino, DC geared motor, PWM motor driver, etc...
That can be used for simple, low resolution 3D models and LASER engraving.

Concept:
* Motor location determined by using resistance strips / DIY liner photo encoder using IR pair.

* Controlling motor rotation in steps by calculating motor rotation degree for each PWM signal at different OEM values / %.

* Conversion of 3D model / 2D engraving design into 0 & 1 bits, considering distance travelled by printing head at each PWM signal as one BIT. (Resolution of printing depends on min / lowest movement distance achievable by motor at one PWM pulse)

* Using regular 3D print head / LASER head, as it's an essential part and should work optimally.

* Body fabrication using FDM board or Acrylic Sheets.

* Use of Threaded Rod to further decrease the head movement distance per PWM pulse.

* Smooth Rods for supports.

* Copper Clad Board (PCB) / Fiber board