how well does filament stick to bed with open design? and what material?

Its a non heated bed and only prints PLA and TPU. It also only has a six inch build area.

A classroom desk. A living room floor. A meeting space. A coffee shop. An outdoor picnic table. These are just some of the places that were not well-suited for 3D printing until now. That’s because ElecFreaks Tech has unveiled a revolutionary FDM machine that is not only affordable but portable as well. Measuring 11.4” x 12.6” x 12.8” in size and weighing a little over six pounds, the Freaks3D will undoubtedly be welcomed with open arms by the DIY community.

Now live on Indiegogo, the Freaks3D boasts a design that will surely separate itself from a rather saturated market with an extremely small and lightweight frame that can be picked up by its customizable handle with only a finger or two. Due to low power consumption, the printer can run on a 12V battery pack, or a pair of 9000mAh lithium batteries for two hours if an outlet isn’t accessible.

    Printer size: 11.4” x 12.6” x 12.8”
    Build volume: 5″ x 6″ x 4″
    Nozzle diameter: 0.4mm
    Resolution: 100 microns
    Connectivity: USB and SD card
    Software: Cura, Repetier Host

Following in the footsteps of its latest crowdfunding success, the ELF VR drone, ElecFreaks Tech has already well surpassed Freaks3D’s initial goal of $20,000 on Indiegogo. Shipment slated for August 2015.

Refer to http://igg.me/at/freaks3d/x/7648351 for more details.