Thanks, I did read your comment about the Prusa, but one of the other comments mentioned it does fit on a Ender 3.
I did though find this
Showing the screen CAN fit an Ender 3. (https://www.thingiverse.com/make:616413)
Select all (because its off screen when it loads)
Move to 0, 0, 0 Its still grey and hanging off the edge.
Rotate, lay flat. This will make it lay straight across the bed, still greyed out.
Next rotate 45 deg. IT FITS!
I have 2mm of brim (max that will fit) because it had bed adhesion issues at the extreme corners.
I am using 0.08 mm layer height for detail. 205 C for stronger bonding of layers. 65C bed first layer to get better adhesion, then drop bed to 50C since long exposure to > 55C deforms the edges. (Temperatures will vary with the PLA used)
DO NOT use .1 mm layer height on Ender 3. Magic numbers are multiples of 0.04 (0.04, 0.08, 0.120....) 0.120 will print faster AND at better quality than 0.10
so once I have caught up with all my printing I am going to make a start on this! and I will post how I get on! Thanks for replying ( seeing this was the reason I bought the printer ;) )