40mm Grease Gun holder

This is a holder for 40mm grease guns. It Is held to any magnetic surface with one circular magnet, and one M4x8 bolt and washer. 

I used these , but you might be able to use another similarly sized magnet. 
https://www.amazon.com/dp/B0CBS3LVDS?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1

I test printed at .2 and .16 layer height. Requires no supports.