This is an accessory for the proxxon 230/E milling machine, it is a precision milling device where you can adjust the depth of milling and lock the milling cutter at the specified height of machining.The model needs to be supplied with polished rods with a diameter of 8mm and plain bearings, I used these: IGUS DryLin RJ4JP-01-08 but you can use any with an outer diameter of 15mm and an inner diameter of 8mm. All screws are M4 except the ones in the top bracket where I used M3. I printed from PLA material because it is very hard. But you can use anything. I used 0,2 layer height, infil 40% of the support only when printing the main part, under the clamps of the rods.