Update: It's difficult to keep the eyepiece centered on the optical axis with this design. I doubt decreasing the drawtube width adjustablility will help (but printed draw-tubes work just fine!) I've been trying to think of a cool/easy way to keep it centered but I think I would rather just design a crayford style focuser....Be sure to use abs juice because there isn't much surface area on these parts! You'll need a mounting plate, 3x "2inchPetal", 3x "2inchPetal LHT mirror". Also I'm using a 1.8 mm Carbon Fiber rod and pressing on some 23/32" rubber wheels I found at a rc hobby shop. I plan to either friction weld caps for the CF rod, or use some fuel hose and glue to captivate the rod. Using a 1.8mm drill bit, i drilled out the holes in the prints and drilled through the wheels. The CF rod is really snug in the printed parts, but the wheels spin with a little bit of force (each wheel turned out different tho). all in all, smooth operation! I'm using nylon bolts to attach the petals (size # 6 or 8, i forget) and #10 for attaching the mounting plate to the secondary cage of a truss tube telescope. once I'm done the stl's shouldn't need any manipulation, just print them in mm. Although... my printer is not extremely well calibrated... it is within 0.01" and the dimensions/clearances where chosen through trial and error, so good luck with that.