This thing is an Acrylic panel for enclosing the top of the Lulzbot Mini 3D Printer. We've had a number of requests to add a top panel for our enclosure kit. (available at: http://drazzticaction.com/products-page-2/3dprinters/lulzbot-acrylic-enclosure/ ) In limited testing we're seen approximately a 10 degree F increase in the build space, with this top plate installed (vs the rest of the enclosure installed - four sides, and leaving the top open). We'd recommend monitoring the build envelope temperature (we used an inexpensive meat thermometer), and not doing unattended printing, when the printer is buttoned up like this. Additional advantages with this top plate installed are that it keeps the interior dust free, and keeps things from falling into the printer. This panel attaches with the same lasercut panel clips as the rest of the enclosure, so it is easy to install and remove. We've made the top plate an option available at: http://drazzticaction.com/products-page-2/3dprinters/top-panel-for-lulzbot-mini-3d-printer/Lasercut or rout out the profile from 3mm acrylic. Lasercut the clips from 6mm acrylic. Install per instruction for the other enclosure panels.