Help soldering and detail model painting for shaky hands joints. Can choose between having a lid or leave it open. Open option gives you more range of motion. 

Print setting

• PLA+
• 0.4 Nozzle
• 0.2 Layer Height
• 15% infill, bigger hand may prefer more infill/weight.

Notes

• No Support needed, see picture for orientation of models. Make sure lay shaft flat. Can replace shaft with metal M8 screw for more stiffness.
• Adjust length by adjusting screw in amount or cut off the shaft as needed
• Added hand tight nuts as needed. Can add to bottom of handle and/or top of ball to help fix the length. Likely not needed if your printer prints dimensionally correct. 
• Can add grease before assemble to increase smoothness. Feels ok to me without grease