Short Body for Neptune 3/4 Pro/Plus/Max Ball Bearing Spool Holder with optional safety cap

Reworked just the Body portion of the original design as Cardboard spools (from Elegoo) needed more clearance. Those walls would grind at the cardboard and leave dust. Use the instructions and other components from "Elegoo Neptune 3/4 Pro/Plus/Max Ball Bearing Spool Holder (M6 bolt remix)” by Engineer4fun. 

M6 bolts did not fit right for me as well so would suggest “Thread adapter for the Neptune 3/4 pro/plus/max ball bearing spool holder” by luisillo for that adapter to use M5 instead.

Credit back to Rui Nelson for “Elegoo Neptune 3 Pro/Plus/Max Ball Bearing Spool Holder lowering 20mm” for the beginnings of this.

An optional SafetyCap is now included to put on the open end. This is to keep really slick or wonky spools from walking off the end.