Designed for use with the wooden Prusa 3 Frame.Has m3 nut traps so arduino can easily be removed to save undoing woodscrews which easily wear down in MDF wood.Note this is designed for the arudino mega orginal (has 1280 chipset) not he new arudino mega 2560.When i get a 2560 board i will make one to fit this as well.BOM : 3 x M3x15 Pozi Pan 3 x M3 Nuts 4 x 3.5x20mm Wood Screws to mountPrint out part ( i use 20% infill) Drill out 3 of the nut trap holes from the top with a 3mm/3.2mm Drill bit Melt in the 3 M3 Nuts to the rear to make sure they are flush Drill out the woodscrew mount holes with a 3.5/4mm drill bit Clean up the countersink holes with a 6/7mm drill bit if you want to. Test fit the arduino If all is good mount the Plate to the wooden frame Screw arudino down using the M3 Pozi Pan Screws.