A compress air powered engine work fine

this isn'my original project i just make some of the part can be printed with bamboo labs printer and change some details. Exploded view in 3d viewer:https://skfb.ly/6LQBRExtra parts needed:M3x8 Bolts (x15)M3 Nuts (x15)Nitrile Gloves (thumbs from M sized gloves worked the best)or Silicon (worse) or PET (not tested) onesOptional parts:M3x12 or longer bolts (2x)M3 Nuts (x2)6x4mm Silicon Pipe (can be found in aquarium shops)M5x10mm Washers (x2) (instead of printed ones)105ZZ Bearings (x2) the list is not same as list Printed well with 0.6 nozzle at 0.2 layer height. Some parts (Cylider_Back_Lid and Valve_Lid_6mm) need supports. After printing cut away the brims from Cylinder_Ring parts.Parts with "X_" in their names are optional.Assembly:Use 3d diagram as a guide: https://skfb.ly/6LQBRCut off a glove finger tip (thumbs from M sized glove worked well)Pull it onto a Cylinder_Ring (Use Helper_Finger to leave enough height)Connect a Piston to it with two WashersClamp the Cylinder_