Core One hydrometer / temperature gauge case

Core One hydrometer/ temperature gauge - easy print (PETG minimum) and fit with M3 x 16 bolt - M3 hex nut - Magnets 10mmx 3mm or 6mm x 2.5mm - hydrometer (available at Amazon) https://www.amazon.com.au/iplusmile/b/ref=bl_dp_s_web_10503092051?ie=UTF8&node=10503092051&field-lbr_brands_browse-bin=iplusmile

Designed to be fitted on the top rail (see photo), various placement options - the gauge measure internal temp and humidity installed close to print (bed) level surface for maximum accuracy potential. 

Fit by using M3 bolt option  (with or with out magnets) remove nylon rivet and insert bolt (three placement options). Snug fit for guage - hex nut - magnets. 

Suggest using a bolt only option

I have not tested a magnet only instal but suggest 10mmx3mm or 6mm x 2.5mm magnets should be suitable - any issues let me know. - Enjoy

UPDATE.   -   Added centre bolt only - a no magnet version STL