It requires the printing of the attached parts, a M3 bolt (20mm), nut and washer. Print all the parts with low layer heights (>0.1mm) and slow print speed (>20mm/s) to get the precision needed. Assembly requires no adhesive, and eyepiece/lense fit snugly into clinometer base. Recommended Print settings Material: PLA Temperature: 185 C Layer Height: 0.05mm Print Speed: 10mm/s Top thickness: 2mm